Local MIL-HDBK-5D equivalent stress based fatigue assessment of the gusset welded joint improved by Portable Pneumatic Needle-Peening treatment

Peiyuan Dai, Naoki Osawa, Sherif Rashed, Donghui Ma, Jun Okada, Masahito Honnami

International Journal of Fatigue　Vol. 177　p. 107913-107913　2023/12　Research paper (scientific journal)

Fatigue assessment of ship structures based on equivalent wave probability (EWP) concept (1st report): Proposal of EWP concept and its verification by 8600TEU container ship's onboard hull monitoring

Takaaki Takeuchi, Naoki Osawa, Akira Tatsumi, Takumi Inoue, Shinichi Hirakawa, Noriaki Seki, Tomomi Yoshida, Rei Miratsu, Shingo Ikeda

Marine Structures　Vol. 91　p. 103476-103476　2023/09　Research paper (scientific journal)

Study on the relationship between the root welding residual stress and the root-failure fatigue strength of Plug Welded specimens

Yukihide Yoshihara, Naoki Osawa, Hidekazu Murakawa, Taiyou Kagase

Welding International　Vol. 37　No. 6　p. 352-364　2023/05/26　Research paper (scientific journal)

Numerical study on local residual stresses induced by high frequency mechanical impact post-weld treatment using the optimized displacement-controlled simulation method

Peiyuan Dai, Phyo Myat Kyaw, Naoki Osawa, Sherif Rashed, Donghui Ma, Jun Okada, Masahito Honnami

Journal of Manufacturing Processes　Vol. 92　p. 262-271　2023/04　Research paper (scientific journal)

Study on the relationship between the root welding residual stress and the root-failure fatigue strength of Plug welded specimens

Yukihide YOSHIHARA, Naoki OSAWA, Hidekazu MURAKAWA, Taiyou KAGASE

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY　Vol. 40　No. 4　p. 238-248　2023/02　Research paper (scientific journal)

Influence coefficient based fracture parameter modification factor in a cracked T-butt welded joint

Phyo Myat Kyaw, Naoki Osawa, Satoyuki Tanaka, Ramy Gadallah

Theoretical and Applied Fracture Mechanics　Vol. 123　p. 103678-103678　2023/02　Research paper (scientific journal)

Fatigue Life Extension of Welded Joints Repaired by Elongated 16Cr8Ni LTT Bead

OSAWA Naoki, HIRAOKA Kazuo, Ninshu MA, Murakawa Hidekazu, TAKEUCHI Takaaki, OKADA Koichi, MATSUZAKI Takuya, SHIGA Chiaki, YAJIMA Hiroshi

Preprints of the National Meeting of JWS　Vol. 2023s　p. 172-173　2023

Study on the Estimation Method for Welding Fatigue Mean Stress Effect Independently from Failure Mode and Joint Type

Yukihide Yoshihara, Naoki Osawa, Hidekazu Murakawa, Dai Peiyuan

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 36　p. 69-79　2022/12　Research paper (scientific journal)

Fracture mechanics investigation of crack coalescence in a steel tubular T-joint specimen

Satoyuki Tanaka, Thin Thin Htut, Kengo Maeda, Kazuhisa Yagi, Naoki Osawa

Engineering Failure Analysis　Vol. 139　2022/09　Research paper (scientific journal)

Numerical Study on Weld Magnification Method for a Semi-Circular Surface Crack Under an Arbitrary Stress Distribution

Phyo Myat Kyaw, Naoki Osawa, Satoyuki Tanaka, Ramy Gadallah

Proceedings of the 41st International Conference on Ocean, Offshore & Arctic Engineering　Vol. 2　2022/06/05　Research paper (international conference proceedings)

Equivalent Distributed Stress Analysis of a Semi-Circular Surface Crack

Zwe Letyar Htut, Naoki Osawa, Satoyuki Tanaka, Phyo Myat Kyaw

Proceedings of the 32nd International Ocean and Polar Engineering Conference, Shanghai, China, June 2022　2022/06　Research paper (international conference proceedings)

Proposal on a Practical Numerical Simulation Technique of HFMI Treatment for Welded Joints

Peiyuan Dai, Phyo Myat Kyaw, Donghui Ma, Jun Okada, Masahito Honnami, Sherif Rashed, Naoki Osawa

Proceedings of the 32nd International Ocean and Polar Engineering Conference, Shanghai, China, June 2022　2022/06　Research paper (international conference proceedings)

Study on Bayesian Inference of Corrosion Model for Ship Structures : MCMC Modeling for the Determination of IACS Corrosion Model Parameters

Morigaki, K, Osawa, N, Takeuchi, T

Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers　Vol. 34　p. 237-240　2022/05

Study on Fatigue Assessment Based on Equivalent Wave Scatter with Data-assimilated Modeling Error by Onboard Measurement

Takeuchi, T, Inoue, T, Osawa, N

Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers　Vol. 34　p. 229-235　2022/05

実船海水バラスト環境における無塗装鋼材のEIS腐食モニタリング

林原 仁志, 石渡 隼也, 井上 朝哉, 高田 篤志, 大沢 直樹, 小島 隆志

材料と環境2022講演論文集　Vol. -　2022　Research paper (scientific journal)

Transient of Steel Corrosion Rate in Seawater Ballast Tank Wet-Dry Cyclic Condition

Hitoshi Hayashibara, Junya Ishiwata, Tomoya Inoue, Atsushi Takada, Naoki Osawa, Ryuji Kojima

Conference Proceedings The Japan Society of Naval Architecture and Ocean Engineering　Vol. 33　p. 299-300　2021/11

Study on Fatigue Assessment of Non-measurement Point Based on Equivalent Wave Scatter Data by Onboard Measurement

Inoue, T, Takeuchi, T, Osawa, N

Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers　Vol. 33　p. 293-298　2021/11

Impact of ship operations aided by voyage optimization on a ship’s fatigue assessment

Xiao Lang, Helong Wang, Wengang Mao, Naoki Osawa

Journal of Marine Science and Technology (Japan)　Vol. 26　No. 3　p. 750-771　2021/09　Research paper (scientific journal)

Development of die-less single-tool multi-point plate forming technology for 3D curved shape

Song Wu, Ninshu Ma, Sherif Rashed, Naoki Osawa

International Journal of Advanced Manufacturing Technology　2021/09　Research paper (scientific journal)

Numerical study on the effect of residual stresses on stress intensity factor and fatigue life for a surface-cracked T-butt welded joint using numerical influence function method

Phyo Myat Kyaw, Naoki Osawa, Satoyuki Tanaka, Ramy Gadallah

Welding in the World　2021/08/21　Research paper (scientific journal)

A crack propagation simulation for a steel CHS T-joint employing an advanced shell-solid finite element modeling

S. Tanaka, K. Maeda, H. Takahashi, H. Okada, K. Yagi, N. Osawa

Journal of Marine Science and Technology　Vol. 27　No. 1　2021/06/25　Research paper (scientific journal)

Study on Automation of Weld Bead Inspection Based on Object Detection

Suzuki, Y, Kawamoto, Y, Go, T, Yoshizuka, T, Yasunaga, A, Yamada, T, Miyajima, H, Osawa, N

Conference proceedings, the Japan Society of Naval Architects and Ocean Engineers　Vol. 32　p. 423-426　2021/05

Control of Car Decks Welding Deformation in RO-RO Ships

Junichi Toyoshima, Kiyoharu Hayashi, Mikikazu Murakami, Masanori Sano, Shogo Imasaki, Yasuo Katayama, Hidekazu Murakawa, Naoki Osawa, Sherif Rashed

Lecture Notes in Civil Engineering　Vol. 65 LNCE　p. 273-286　2021　Research paper (international conference proceedings)

Numerical and experimental study on residual stress at the weld root of plug joint

YOSHIHARA Yukihide, OSAWA Naoki

Preprints of the National Meeting of JWS　Vol. 2021　p. 124-125　2021

Fatigue life prediction for 9%Ni steel butt welded joints

Toru Shiratsuchi, Naoki Osawa

International Journal of Fatigue　Vol. 142　p. 105925-105925　2021/01　Research paper (scientific journal)

Study on Fatigue Strength of Welded Joints Subject to Intermittently Whipping Superimposed Wave Load

Naoki Osawa, Luis De Gracia, Kazuhiro Iijima, Norio Yamamoto, Kyosuke Matsumoto

Lecture Notes in Civil Engineering　p. 454-472　2021　Part of collection (book)

Mechanical Evaluation for a Fatigue Fracture Surface generated in Steel T-shaped Tubular Joints with Different Weld Toe Radius

Kengo Maeda, Satoyuki Tanaka, Hiroki Takahashi, Kazuhisa Yagi, Naoki Osawa

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 32　No. 32　p. 141-152　2020/12　Research paper (scientific journal)

Study on the stability of compressive residual stress induced by high-frequency mechanical impact under cyclic loadings with spike loads

Hector Ruiz, Naoki Osawa, Sherif Rashed

Welding in the World　Vol. 64　No. 11　p. 1855-1865　2020/11　Research paper (scientific journal)

The thickness effect of hot spot S-N curves for welded aluminum joints

Toru Shiratsuchi, Naruyoshi Izumi, Tatsuya Imai, Satoru Nishimoto, Yuta Hasegawa, Naoki Osawa

Welding in the World　Vol. 64　No. 9　p. 1521-1534　2020/09　Research paper (scientific journal)

Accurate evaluation of fracture parameters for a surface-cracked tubular T-joint taking welding residual stress into account

Ramy Gadallah, Seiichiro Tsutsumi, Satoyuki Tanaka, Naoki Osawa

Marine Structures　Vol. 71　p. 102733-102733　2020/05　Research paper (scientific journal)

Investigation of thickness and bead profile effects on fatigue strength of welded joints based on relative stress gradient

Toru Shiratsuchi, Naoki Osawa

International Journal of Fatigue　Vol. 134　p. 105520-105520　2020/05　Research paper (scientific journal)

Study on Fatigue Assessment Based on Bayesian Inference of Equivalent Wave Scatter Data

Naoki Osawa, Taiga Mitsuyuki, Akira Tatsumi, Tomohiro Yuzui, Hitoi Tamaru, Masayoshi Oka

Conference Proceedings of JASNOAE　No. 30　2020/05　Research paper (scientific journal)

Bayesian Inference of Hull-girder Bending Moment in an Encountered Short-term Sea State

Akira Tatsumi, Godai Sonoda, Taiga Mitsuyuki, Tomohiro Yuzui, Masayoshi Oka, Naoki Osawa

Conference Proceedings of JASNOAE　No. 30　2020/05　Research paper (scientific journal)

Accurate and efficient method for analyzing mixed-mode SIFs for inclined surface cracks in semi-infinite bodies by using numerical influence function method

Kyaw Phyo Myat, Naoki Osawa, Ramy Gadallah, Satoyuki Tanaka

Theoretical and Applied Fracture Mechanics　Vol. 106　p. 102471-102471　2020/04　Research paper (scientific journal)

Comparative study on stress intensity factors for surface cracks in welded joint and flat plate by using the influence function method

Phyo Myat Kyaw, Naoki Osawa, Ramy Gadallah, Satoyuki Tanaka

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE　Vol. 2　2020　Research paper (international conference proceedings)

A study on the difference in wave statistics based on storm model for the ship structural assessment

Luis de Gracia, Helong Wang, Wengang Mao, Naoki Osawa

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE　Vol. 2　2020　Research paper (international conference proceedings)

A Study on Fatigue Life Improvement of Welded Joints using Elongated Bead Welding with Low Transformation Temperature Welding Material

MATSUZAKI Takuya, YAJIMA Hiroshi, MURAKAWA Hidekazu, MA Ninshu, TSUTSUMI Seiichiro, HIRAOKA Kazuo, OSAWA Naoki, OKADA Koichi, TANINO Tadakazu, SHIGA Chiaki

Journal of High Pressure Institute of Japan　Vol. 58　No. 1　p. 22-38　2020

Study on Equivalent Distributed Stress Determination Technique based on Generalized Matrix Inversion (Part 1) －Analysis of Two-dimensional Edge Cracks based on the Center Cracked Plate’s Weight Function－

Masahiro Toyosada, Kazuki Tanaka, Kyosuke Matsumoto, Satoyuki Tanaka, Naoki Osawa

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 31　No. 0　p. 213-228　2020　Research paper (scientific journal)

Cellular Automaton Analysis Considering Spatial Covariance Structure on Under-film Corrosion

Kazuhiko Shiotani, Naoki Osawa

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 31　No. 0　p. 135-144　2020　Research paper (scientific journal)

Comparison of two statistical wave models for fatigue and fracture analysis of ship structures

Luis De Gracia, Helong Wang, Wengang Mao, Naoki Osawa, Igor Rychlik, Gaute Storhaug

Ocean Engineering　Vol. 187　p. 106161-106161　2019/09　Research paper (scientific journal)

A practical analysis of residual stresses induced by high-frequency mechanical impact post-weld treatment

Hector Ruiz, Naoki Osawa, Sherif Rashed

Welding in the World　Vol. 63　No. 5　p. 1255-1263　2019/09　Research paper (scientific journal)

Influence of preheating flame composition on oxy-hydrogen gas cutting efficiency

Cesar Pinzon, Naoki Osawa, Yuichi Ikegami

Proceedings of the International Offshore and Polar Engineering Conference　Vol. 4　p. 3943-3948　2019　Research paper (international conference proceedings)

A study on welding distortion mitigation by gas heating using a linearized inherent strain method

Hector Ruiz, Naoki Osawa, Sherif Rashed

Proceedings of the International Offshore and Polar Engineering Conference　Vol. 4　p. 3955-3959　2019　Research paper (international conference proceedings)

Numerical investigation on the influence of tensile overload on fatigue life using the interaction integral method

Ramy Gadallah, Seiichiro Tsutsumi, Naoki Osawa

Journal of Japan Society of Civil Engineers, Ser. A2　Vol. 74　No. 2　p. I_137-I_146　2019/01　Research paper (scientific journal)

Influence of Inorganic Zinc Primer on Under-film Corrosion Simulation Parameters Based on Cellular Automaton

Kazuhiko Shiotani, Naoki Osawa, Bin Abdul Halim Azhan, Naoto Nakamura

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 29　No. 0　p. 57-64　2019　Research paper (scientific journal)

Study on the Influence of the Preheating Flame Characteristics and the Oxy-fuel Gas Cutting Performance

Cesar Pinzon, Naoki Osawa, Yuichi Ikegami

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 29　No. 0　p. 135-146　2019　Research paper (scientific journal)

A Study on the Fatigue Damage Estimation with the consideration of Wave-induced Vibrations

Luis Carlos De Gracia, Naoki Osawa, Kazuhiro Iijima, Norio Yamamoto, Hector Ruiz

日本船舶海洋工学会秋季講演会　2018/11

Critical investigation on the influence of welding heat input and welding residual stress on stress intensity factor and fatigue crack propagation

Ramy Gadallaha, Naoki Osawa, Satoyuki Tanaka, Hiroshima Univ, Seiichiro Tsutsumi (Joining, Welding Research Inst, Osaka Universit

Engineering Failure Analysis　Vol. 89　p. 200-221　2018/07　Research paper (scientific journal)

Stability of Compressive Residual Stress Introduced by HFMI Technique

Hector Olmedo Ruiz Valdes, Naoki Osawa, Hidekazu Murakawa, Sherif Rashed

Volume 4: Materials Technology　2018/06/17　Research paper (international conference proceedings)

A Study on the Stochastic Aspects of the Whipping Vibrations in a Container Ship

Luis De Gracia, Naoki Osawa, Kazuhiro Iijima, Toichi Fukasawa, Hitoi Tamaru

Volume 3: Structures, Safety, and Reliability　2018/06/17　Research paper (international conference proceedings)

2018S-GS5-4 A Study on Fatigue Life Improvement of Welded Joint and Fracture Toughness of Weld MetalUsing Low Transformation Temperature Welding Material

Okada Koichi, Osawa Naoki, Ma Ninshu, Tsutsumi Seiichiro, Murakawa Hidekazu, Hiraoka Kazuo, Matsuzaki Takuya, Shiga Chiaki, Yajima Hiroshi

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers　Vol. 26　p. 245-249　2018/05/21

A novel approach to evaluate mixed-mode SIFs for a throughthickness crack in a welding residual stress field using an ffective welding simulation method

Ramy Gadallaha, Naoki Osawa, Satoyuki Tanaka, Hiroshima Univ, Seiichiro Tsutsumi (Joining, Welding Research Inst, Osaka Universit

Engineering Fracture Mechanics　2018/04　Research paper (scientific journal)

Technical Investigation on Drill Pipe Failure

Tomoya Inoue, Kazuyasu Wada, Naoki Osawa, Masahiko Fujikubo, Hiroyoshi Suzuki, Ciro Santus

Journal of the Japan Society of Naval Architects and Ocean Engineers　Vol. 26　p. 183-193　2018/03　Research paper (scientific journal)

A Comparative Study on Fatigue Damage using a Wave Load Sequence Model

Luis De Gracia, Naoki Osawa, Hitoi Tamaru, Toichi Fukasawa

KnE Engineering　Vol. 3　No. 1　p. 160-160　2018/02/11　Research paper (scientific journal)

Study on hot spot S-N curve for welded aluminum joints with various plate thicknesses

Toru Shiratsuchi, Naruyoshi Izumi, Tatsuya Imai, Satoru Nishimoto, Yuta Hasegawa, Naoki Osawa

Proceedings of the International Offshore and Polar Engineering Conference　Vol. 2018-　p. 64-70　2018　Research paper (international conference proceedings)

A Study on the Stochastic Characteristics of Wave Load Sequences including Whipping Vibrations in a Container Ship

Luis DE GRACIA, Naoki OSAWA, Kazuhiro IIJIMA, Toichi FUKASAWA

2017/09　Research paper (international conference proceedings)

Elongated bead weld method for improvement of fatigue properties in welded joints of ship hull structures using low transformation temperature welding materials

C. Shiga, H. Murakawa, K. Hiraoka, N. Osawa, H. Yajima, T. Tanino, S. Tsutsumi, T. Fukui, H. Sawato, K. Kamita, T. Matsuzaki, T. Sugimura, T. Asoda, K. Hirota

WELDING IN THE WORLD　Vol. 61　No. 4　p. 769-788　2017/06　Research paper (scientific journal)

Study on Under-film Corrosion Simulation Method Based on Cellular Automaton (2st Report: Corrosion Simulation of Free Edges in Water Ballast Tanks)

Naoki Osawa, Kazuhiko Shiotani, JFE Steel, Atsushi Takada, National Maritime Research Inst, Seiru Takeno, Shino Katayama, Takuya Oda

J. Japan Soc. Naval Architects and Ocean Engineers　Vol. 25　p. 123-131　2017/06　Research paper (scientific journal)

Study on under-film corrosion simulation of free edges in water ballast tanks

Naoki Osawa, Seiru Takeno, Shino Katayama, Takuya Oda, Azhan Bin Abdul Halim, Kazuhiko Shiotani, JFE Steel, Atsushi Takada, National Maritime Research Inst

Progress in the Analysis and Design of Marine Structures　Vol. 25　p. 123-131　2017/05　Research paper (scientific journal)

Evaluation of crack propagation behaviors in a T-shaped tubular joint employing tetrahedral FE modeling

Kazuhisa Yagia, Sanoyasu Shipbuilding, Satoyuki Tanak, oshima U, Takahiro Kawahara, Hiroshima Univ, Kanta Nihei, Kawasaki Technology, Hiroshi Okada (Tokyo, University of Science, NaokiOsawa

International Journal of Fatigue　2017/03　Research paper (scientific journal)

A study on the influence of weather routing on the preciseness of ship structure's fatigue assessment

Luis De Gracia, Hitoi Tamaru, Naoki Osawa, Toichi Fukasawa

Proceedings of the International Offshore and Polar Engineering Conference　p. 957-963　2017　Research paper (international conference proceedings)

Evaluation of stress intensity factor for a surface cracked butt welded joint based on real welding residual stress

Ramy Gadallah, Naoki Osawa, Satoyuki Tanaka

Ocean Engineering　2017/01　Research paper (scientific journal)

Fundamental study on under-film corrosion simulation method based on cellular automaton

Naoki Osawa, Yasuhide Kanou, Yokohama National Uni, Yasumi Kawamura, Yokohama National Uni, Atsushi Takada, National Maritime Research Inst, Kazuhiko Shiotani, JFE Steel, Seiru Takeno, Shino Katayama

Proc. 13th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS'2016)　2016/09　Research paper (scientific journal)

Prediction of Distortion Produced in Welded Structures during Straightening Process Using the Inherent Strain Method

Hector Olmedo Ruiz Valdes, Naoki Osawa, Hidekazu Murakawa (Joini, Welding Research Inst, Osaka Univ, Sherif Rashed, CAE La

Proc. 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016)　2016/06　Research paper (scientific journal)

Uncertainties of Crack Propagation Analysis in Ship Structures

Wengang Mao, Chalmers Univ, Jingxia Yue, C, almers Univ, Da Wu (Chalmers Univ, Luis De Gracia, Naoki Osawa

Proc. 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016)　2016/06　Research paper (scientific journal)

Numerical Estimation on Stress Intensity Factors for Surface Cracks in a Welding Residual Stress Field

Ramy Gadallah, Naoki Osawa, Satoyuki Tanaka

Proc. 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016)　2016/06　Research paper (scientific journal)

Influence of Different Wave Load Sequence Models on Fatigue Life Prediction of Ship Structures Based on Fracture Mechanics Approach

Luis De Gracia, Naoki Osawa, Wengang Mao, C, almers Univ, Daichi Ichihashi

Proc. 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016)　2016/06　Research paper (scientific journal)

Development of Under-Film Corrosion Simulation Method based on Cellular Automaton

Naoki Osawa, Yasuhide Kanou, Yokohama National Uni, Yasumi Kawamura, Yokohama National Uni, Atsushi Takada, National Maritime Research Inst, Kazuhiko Shiotani, JFE Steel, Seiru Takeno, Shino Katayama, Kristov Ivan William

Proc. 35th International Conference on Ocean, Offshore and Arctic Engineering (OMAE2016)　2016/06　Research paper (scientific journal)

Improvement of Prediction Accuracy of Hull Fatigue Life by a Fatigue Damage Sensor under a Storm Model Loading : Prediction method applying frequency distribution data related to ship sailing

Tomohei Kobayashi, Kawasaki Heavy Industries, Yukichi Takaoka(Kawasaki, Heavy Industries, Kanta Nihei, Kawasaki Technology, Naoki Osawa, De Gracia Luis, Daichi Ichihashi

J. Japan Soc. Naval Architects and Ocean Engineers　No. 23　p. 153-167　2016/06　Research paper (scientific journal)

Improvement of Prediction Accuracy of Hull Fatigue Life by a Fatigue Damage Sensor under a Storm Model Loading

Tomohei Kobayashi, Kawasaki Heavy Industries, Yukichi Takaoka(Kawasaki, Heavy Industries, Kanta Nihei, Kawasaki Technology, Naoki Osawa, De Gracia Luis, Daichi Ichihashi

J. Japan Soc. Naval Architects and Ocean Engineers　No. 23　p. 153-167　2016/06　Research paper (scientific journal)

Study on Underfilm Corrosion Simulation Method Based on Cellular Automaton(1st Report)corrosion simulation of coated and scribed steel panels

Naoki Osawa, Yasumi Kawamura, Yokohama National Uni, Yasuhide Kanou, Yokohama National Uni, Atsushi Takada, National Maritime Research Inst, Kazuhiko Shiotani, JFE Steel, Seiru Takeno, Shino Katayama

J. Japan Soc. Naval Architects and Ocean Engineers　No. 23　p. 139-151　2016/06　Research paper (scientific journal)

Study on Fatigue Strength of Welded Joints Subject to High Frequency Superimposed Wave Loadings by Using Plate-Bending-Vibration Type Fatigue Testing Machines

Naoki Osawa, Tetsuya Nakamura, Marin, Norio Yamamoto, ClassNK, Junji Sawamura

J. Japan Soc. Naval Architects and Ocean Engineers　Vol. 22　p. 175-185　2015/12　Research paper (scientific journal)

Development of Advanced Fatigue Strength Improvement Method for Ship's Out-of-Plane Gusset Welded Joints Using Low Transformation Temperature Welding Material

Chiaki Shiga(Joining, Welding Research Inst, Osaka Univ, Kazuo Hiraoka(Joining, Welding Research Inst, Osaka Univ, Hiroshi Yajima, Nagasaki Inst, Applied Science, Tadakazu Tanino, agasaki Inst, Applied Science, Hidekazu Murakawa(Joinin, Welding Research Inst, Osaka Univ, Seiichiro Tsutumi(Joining, Welding Research Inst, Osaka Univ, Naoki Osawa

Proc. 25th Int. Offshore and Polar Engineering Conf (ISOPE2015).　Vol. 2015-January　p. 508-513　2015/06　Research paper (scientific journal)

Experimental Study on Fatigue Strenght of Ship's Welded Joint under Intermittently Hight Frequency Superimposed Loads Considering Actual Encountered Condition

Naoki Osawa, Tetsuya Nakamura, Marin, Norio Yamamoto, ClassNK, Junji Sawamura

Proc. 25th Int. Offshore and Polar Engineering Conf (ISOPE2015).　2015/06　Research paper (scientific journal)

Numerical Study on Heat Straightening Process for Welding Distortion of a Stiffened Panel Structure

Juan Blandon (Joining, Welding Research Inst, Osaka Univ, Naoki Osawa, Sano Masanori, Naikai Zosen, Sherif Rashed(CAE Lab, Hidekazu Murakawa (Joi, Welding Research Inst, Osaka Uni

Proc. 25th Int. Offshore and Polar Engineering Conf (ISOPE2015).　2015/06　Research paper (scientific journal)

Development of Fe(II) Fluorescent Indicator for Underfilm Corrosion Monitoring of Water Ballast Tank

Naoki Osawa, Atsushi Takada, National Maritime Research Inst, Takashi Kojima, National Maritime Research Inst, Sho Takano, Shino Katayama, Seiru Takeno

Proc. 25th Int. Offshore and Polar Engineering Conf (ISOPE2015).　2015/06　Research paper (scientific journal)

Characterization and Numerical Simulation of Corroded Surface of Coated Steel Plates in Water Ballast Tank

Yasumi Kawamura, Yokohama National Uni, Yasuhide Kanou, Yokohama National Univ, Naoki Osawa, Norio Yamamoto, ClassNK, Kazuhiko Shiotani, JFE Steel, Kazuyuki Kashima, Nippon Steel, Sumitomo Metal, Shinji Sakashita, Kobe Ste, Kenji Katoh, loyd's Register Japa, Sho Takano

Proc. 25th Int. Offshore and Polar Engineering Conf (ISOPE2015).　2015/06　Research paper (scientific journal)

Onboard Study on Deterioration of Coated Steel in Water Ballast Tank

Shinji Sakashita, Kobe Steel, Kazuhiko Shiotani, JFE Steel, Kazuyuki Kashima, Nippon Steel, Sumitomo Metal, Satoshi Murakoshi, Mitsui, O.S.K. Lines, Keita Fukunaga, YK Line, Tsutomu Baba, Chugoku Marine Paints, Akira Takai, Marine Coatin, Atsushi Takada, National, Maritime Research Inst, Naoki Osawa

Proc. 25th Int. Offshore and Polar Engineering Conf (ISOPE2015).　2015/06　Research paper (scientific journal)

Development of Fe(II) Fluorescent Indicator for Under-Film Corrosion Monitoring of Epoxy-coated Steel Panels

Naoki Osawa, Atsushi Takada, National Maritime Research Inst, Takashi Kojima, National Maritime Research Inst, Sho Takano

J. Japan Soc. Naval Architects and Ocean Engineers　Vol. 21　p. 93-99　2015/05　Research paper (scientific journal)

Numerical Study on Cyclic Crystalline Slip Deformation of Polycrystalline Metallic Material by Homogenization Method

Naoki Osawa, Noritaka Saito

Proc. 24th Int. Offshore and Polar Engineering Conf (ISOPE2014).　2014/06　Research paper (scientific journal)

Experimental Study on High Frequency Effect on Fatigue Strength of Welded Joints by Using Plate-Bending-Vibration Type Fatigue Testing Machines

Naoki Osawa, Tetsuya Nakamura, Marin, Norio Yamamoto, ClassNK, Junji Sawamura

Proc. 33rd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2014)　2014/06　Research paper (scientific journal)

Study on the relationship between the heat transfer characteristics of preheating gas and cutting performance of oxyfuel gas cutting

Naoki Osawa, Junji Sawamura, Yuichi Ikegami, Airwater Inc, Kazue Yamaguchi

Welding International　2014/04　Research paper (scientific journal)

NUMERICAL STUDY ON MECHANICAL CHARACTERISTIC OF HEAT SOURCE FOR LINE HEATING

Blandon Juan, Sano Masanori, Osawa Naoki, Rashed Sherif, Murakawa Hidekazu

Preprints of the National Meeting of JWS　Vol. 2014　p. 314-315　2014

Experimental Study on High Frequency Effect on Fatigue by Using the New High Speed Fatigue Testing Machine

Naoki Osawa, Tetsuya Nakamura, Marin, Norio Yamamoto, ClassNK, Junji Sawamura

Proc. 12th International Symposium on Practical Design of Ships and Other Floating Structures (PRADS2013)　2013/10　Research paper (scientific journal)

Analysis of Crack Retardation Effects and Crack Path in Ship Structure Members on Different Routes

Fredhi Agung Prasetyo, Wengang Mao(Chalmers University, Tomohei Kobayashi, Kawasaki Heavy Industirs, Naoki Osawa, Jonas W. Ringsberg, Chalmers University

Proc. 13th Int. Conf. on Fracture (ICF13)　2013/06　Research paper (scientific journal)

A comparison of two wave models and their influence on fatigue damage in ship structures

Wengang Mao(Chalmers University, Fredhi Agung Prasetyo, Jonas W. Ringsberg, Chalmers University, Naoki Osawa

Proc. 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2013)　2013/06　Research paper (scientific journal)

Development of a new fatigue testing machine for high frequency fatigue damage assessment

Naoki Osawa, Tetsuya Nakamura, Marin, Norio Yamamoto, ClassNK, Junji Sawamura

Proc. 32nd International Conference on Ocean, Offshore and Arctic Engineering (OMAE2013)　2013/06　Research paper (scientific journal)

Study on the Relationship between the Heat Transfer Characteristics of Preheating Gas and Cutting Performance of Oxyfuel Gas Cutting

Naoki Osawa, Junji Sawamura, Yuichi Ikegami, Airwater Inc, Kazue Yamaguchi

quarterly journal of the Japan Welding Society　2013/03　Research paper (scientific journal)

Study of Heattransfer During Piercing Process of Oxyfuel Gas Cutting

Naoki Osawa, Junji Sawamura, Yuichi Ikegami, Naoya Okamoto

Welding in the World　2013/03　Research paper (scientific journal)

Study on Preciseness of Load History Generation based on Storm model for Fatigue Assessment of Ship Structure Members

Fredhi Agung Prasetyo, Naoki Osawa, Tomohei Kobayashi, Kawasaki Heavy Industries

Proc. 22th Int. Offshore and Polar Engineering Conf (ISOPE2012).　2012/07　Research paper (scientific journal)

Study on the Effect of Storm Duration Fluctuation on the Accuracy of Fatigue Assessment of Ship Structural Member

Fredhi Agung Prasetyo, Naoki Osawa, Junji Sawamura

Proc. 21th Int. Offshore and Polar Engineering Conf (ISOPE2011).　2011/06　Research paper (scientific journal)

Study on the preciseness of hot spot stress of web-stiffened cruciform welded joints derived from shell finite element analyses

Naoki Osawa, Norio Yamamoto(ClassNK, Tetsuji Fukuoka(Mitsui Shipbuilding, Engineering, Junji Sawamura, Hiroshi Nagai, Shingo Maeda

Marine Structures　2011/02　Research paper (scientific journal)

Study on the accuracy of Influence Factor Method when applied to surface cracks in a welded joint of a ship structure

Naoki Osawa, Junji Sawamura, Shota Okada, Kei Shigeta, Tomohide Tsuji

Proceedings of the International Offshore and Polar Engineering Conference　p. 51-58　2011　Research paper (international conference proceedings)

Study on the Preciseness of Hot Spot Stress of Web-Stiffened Cruciform Welded Joints Derived by Shell Finite Element Analyses

Naoki Osawa, Norio Yamamoto(ClassNK, Tetsuji Fukuoka(Mitsui Shipbuilding, Engineering, Junji Sawamura, Hiroshi Nagai, Shingo Maeda

J. Japan Soc. Naval Architects and Ocean Engineers　2010/12　Research paper (scientific journal)

Study of Heat Transfer during Preheating for Piercing of Oxyfuel Gas Cutting

Naoki Osawa, Junji Sawamura, Yuichi Ikegami, Airwater Inc, Naoya Okamoto

quarterly journal of the Japan Welding Society　Vol. 28　p. 427-435　2010/12　Research paper (scientific journal)

Study on the accuracy of influence factor method when applied to surface cracks in a welded joint of a ship structure

Naoki Osawa, Junji Sawamura, Shota Okada, Kei Shigeta, Tomohide Tsuji

J. Japan Soc. Naval Architects and Ocean Engineers　Vol. 12　p. 201-208　2010/12　Research paper (scientific journal)

Numerical Modeling for Ship Maneuvering in Level Ice

Junji Sawamura, Hiroyuki Tsuchiya, Takashi Tachibana, Naoki Osawa

Proceedings of The 20th IAHR International Symposium On Ice　2010/07　Research paper (international conference proceedings)

Numerical Investigation for the Bending Failure of Wedge-Shaped Floating Ice

Junji Sawamura, Takashi Tachibana, Hiroyuki Tsuchiya, Naoki Osawa

Proceedings of The 20th IAHR International Symposium On Ice　2010/07　Research paper (international conference proceedings)

Development of a structural hot spot stress estimation technique based on shell fe analysis for ship structural details under the real load

Naoki Osawa, Norio Yamamoto, Tetsuji Fukuoka, Junji Sawamura, Hiroshi Nagai, Shingo Maeda

11th International Symposium on Practical Design of Ships and Other Floating Structures, PRADS 2010　Vol. 2　p. 1033-1043　2010　Research paper (international conference proceedings)

フリーエッジ形状とエッジ膜厚保持率の関係の数値解析

澤村淳司, 大沢直樹, 菊澤遼平

日本船舶海洋工学会講演会論文集　2009/06

Development of a simple estimation method for fatigue crack growth rate

Naoki Osawa, Junji Sawamura, Hiroshi Asai, Masaki Kuwahara

Proceedings of the International Offshore and Polar Engineering Conference　p. 422-428　2009　Research paper (international conference proceedings)

Comparative study on estimation techniques for local stress of web stiffened cruciform connections

Naoki Osawa, Junji Sawamura, Tsutomu Fujiwara, Hiroshi Nagai

Proceedings of the International Offshore and Polar Engineering Conference　p. 240-245　2009　Research paper (international conference proceedings)

An Application to Welded Joints of the Crack Inspection System by Using Magnetic Properties

Kiyoshi Hashimoto, Naoki Osawa, Junji Sawamura, Hiroshi Asai

Proc. 18th International Offshore and Polar Engineering Conference　2008/07　Research paper (international conference proceedings)

GA-based Heat Input Estimation Technique for Simulation of Shell Forming by Line-Heating

Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura, Hironori Tanaka

Proc. 18th International Offshore and Polar Engineering Conference　p. 285-290　2008/07　Research paper (international conference proceedings)

Numerical Study on the Fatigue Crack Propagation Behavior in Flattened Martensite Dual Phase Steel

Naoki Osawa, Daiki Ueno, Ryo Shimoike, Kiyoshi Hashimoto, Kiyotaka Nakashima, Tetsuro Nose

Proc. 18th International Offshore and Polar Engineering Conference　Vol. 6　p. 387-387　2008/07　Research paper (international conference proceedings)

2008K-G7-2 Study on the Effect of Misalignment on the Fatigue Strength of a Welded Joint in Actual Ship Structures

Osawa Naoki, Sawamura Junji, Fujiwara Tsutomu

Conference Proceedings The Japan Society of Naval Architects and Ocean Engineers　Vol. 7　p. 109-112　2008

Numerical Study on the Fatigue Crack Propagation Behavior in Flattened Martensite Dual Phase Steel

Naoki Osawa, Daiki Ueno, Ryo Shimoike, Kiyoshi Hashimoto, Kiyotaka Nakashima, Tetsuro Nose

Journal of The Japan Society of naval Architects and Ocean Engineers　2007/12　Research paper (scientific journal)

Study on the Relationship between Shell Stress and Solid Stress in Fatigue Assessment of Ship Structure

Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura, Tohei Nakai, Shota Suzuki

Proc. 10th Symposium on Practical Design of Ships and Other Floating Structures　Vol. 2　p. 1142-1149　2007/09　Research paper (international conference proceedings)

Estimate Method of Hotspot Stress for Ship Structural Members Based on FE Analysis

Norio Yamamoto, Naoki Osawa, Koji Terai

Proc. 10th Symposium on Practical Design of Ships and Other Floating Structures　2007/09　Research paper (international conference proceedings)

Study on the Alternatives to the Secondary Surface Preparation in Protective Coatings

Naoki Osawa, Koichiro Umemoto, Yukinori Nambu, Tatsuya Kuramoto

Proc. International Symposium on SHIPBUILDING TECHNOLOGY (ISST 2007) - Fabrication and Coatings -　2007/09　Research paper (international conference proceedings)

Study on the relationship between shell stress and solid stress in the vicinities of ship's welded joints

Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura, Tohei Nakai, Shota Suzuki

Proc. 17th International Offshore and Polar Engineering Conference　2007/07　Research paper (international conference proceedings)

Study on shell-solid coupling FE analysis for fatigue assessment of ship structure

Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura, Tohei Nakai, Shota Suzuki

Marine Structures　Vol. 20　p. 143-163　2007/07　Research paper (scientific journal)

Development of Heat Input Estimation Technique for Simulation of Shell Forming by Line-Heating

Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura, Jun Kikuchi

Computer Modeling in Engineering & Sciences　Vol. 20　No. 1　p. 43-53　2007/01　Research paper (scientific journal)

Study on the Relationship between the Crack Propagation Rate and the Cyclic Softening Characteristics of Ship Structural Steel

Naoki Osawa, Daiki Ueno, Ryo Shimoike, Kiyoshi Hashimoto, Akinori Inai

Journal of The Japan Society of naval Architects and Ocean Engineers　No. 4　p. 257-267　2006/12　Research paper (scientific journal)

Numerical Estimation of Torsional Deformation of a Ship Longitudinal Frame Formed by Gas Heating

Naoki Osawa, Hajime Kaminaga, Motohisa Onoe, Hidekazu Murakawa, Kazuhiko Tani

Proc. 16th International Offshore and Polar Engineering Conference　2006/05　Research paper (international conference proceedings)

Numerical evaluation of welded toe cracks for ship structures

Junji Sawamura, Naoki Osawa, Kiyoshi Hashimoto, Hiroshi Chousokabe, Tetsuji Toshimitsu

Proceedings of the International Offshore and Polar Engineering Conference　p. 376-379　2006　Research paper (international conference proceedings)

Research on development of a non-destructive crack inspection system by using magnetic properties

Kiyoshi Hashimoto, Naoki Osawa, Junji Sawamura, Hiroki Wada, Hideyuki Mori, Yoshiteru Tanaka

Proceedings of the International Offshore and Polar Engineering Conference　p. 86-91　2006　Research paper (international conference proceedings)

Thermal-Elasto-Plastic F.E. Analysis of Torsional Deformation of Ship Longitudinal Frame Produced by Gas Heating

Naoki Osawa, Hajime Kaminaga, Motohisa Onoe, Hidekazu Murakawa, Kazuhiko Tani, Masashi Nao

J. Soc. Naval Architects, Japan　2005/05　Research paper (scientific journal)

Temperature History Estimation for Face Repetitive Heating during Twisting Process of Ship Longitudinal Frame

Naoki Osawa, Motohisa Onoe, Kazuhiko Tani, Masashi Nao, Hajime Kaminaga, Hidekazu Murakawa

J. Soc. Naval Architects, Japan　2005/05　Research paper (scientific journal)

Three-dimensional Numerical Investigation on Thickness-through Fatigue Crack Closure

Yoshikazu Ohno, Naoki Osawa, Yasumitsu Tomiita, Kiyoshi Hashimoto

J. Soc. Naval Architects, Japan　2004/12　Research paper (scientific journal)

Numerical Evaluation of S.I.F. of Surface Crack on Weld Bead using Automated Meshing Software and Incompatible Meshing

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Kenji Nakata

Proc. Welding Structure Symposium 2004　2004/11

Study on Fatigue Design Loads for Ships based on Crack Growth Analysis

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, YeHong Wang

Journal of ASTM International　2004/10　Research paper (scientific journal)

Improvement of the Accuracy of Heat Input Estimation during Line Heating Process by using Regularization Method

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Jun Kikuchi

Proc. 9th Symposium on Practical Design of Ships and Other Floating Structures　p. 974-981　2004/09　Research paper (international conference proceedings)

Development of Heat Input Estimation Technique for Line-Heating Process based on Inverse Heat Conduction Analysis

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Kiyoshi Matsuoka(Mitsubishi Heavy, Industries, Ltd, Jun Kikuchi

Proc. 14th International Offshore and Polar Engineering Conference　2004/05　Research paper (international conference proceedings)

The Study of Fatigue Design Method based on Fatigue Crack Growth Analysis (3rd Report)

Koji Terai, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Yehong Wang

J. Soc. Naval Architects, Japan　No. 193　p. 49-56　2003/12　Research paper (scientific journal)

Study of fatigue crack nucleation process by crystalline FE analysis

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto

Journal of Marine Schience and Technology　2003/12　Research paper (scientific journal)

Three-dimensional Numerical Investigation on Thickness-through Fatigue Crack Closure

Tetsuji Miyashita, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Yoshikazu Ohno

Proc. 13th International Offshore and Polar Engineering Conference　2003/05　Research paper (international conference proceedings)

A New Approach to Fatigue Strength Evaluation of Ship Hull (2nd Report)

YeHong Wang, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Koji Terai

Proc. 13th International Offshore and Polar Engineering Conference　2003/05　Research paper (international conference proceedings)

The Study on Fatigue Design Method based on Fatigue Crack Growth Analysis (2nd Report)

Koji Terai, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa

J. Soc. Naval Architects, Japan　No. 192　p. 555-562　2002/12　Research paper (scientific journal)

Improvement of the Accuracy of Heat Input Estimation Technique based on Inverse Heat Conduction Analysis by the Introduction of Regularization Method

Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto

J. Soc. Naval Architects, Japan　Vol. 192　p. 519-529　2002/12　Research paper (scientific journal)

Study on Setting the Conditions of Initial Cracks for Fatigue Strength Evaluation of Welded Structures

Yehong Wang, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa

J. Soc. Naval Architects, Japan　No. 192　p. 545-553　2002/12　Research paper (scientific journal)

Study on the Combustion Model and Turbulent Model for Thermal-Flow Analysis of Impinging Jet Flame during Line Heating Process

Junji Sawamura, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto

J. Soc. Naval Architects, Japan　No. 192　p. 531-543　2002/12　Research paper (scientific journal)

Study on the Estimation Method of Heat Input during Gas Heating Process Accompanied by Non Line Heating

Yasumitsu TOMITA, Naoki OSAWA, Kiyoshi HASHIMOTO

Proc. Welding Structure Symposium 2002　2002/11

A Study on Heat Transfer to Steel Plate from Combustion Flux in Line Heating

Yoshihiro Deguchi(Mitsubishi Heavy Industries, Lt, Tsuyotoshi Yamaura(Mitsubishi Heavy, Industries, Ltd, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura

Proc. 10th International Symposium on Flow Visualization　2002/08　Research paper (international conference proceedings)

A New Approach to Fatigue Strength Evaluation of Ship Hull

Y. H. Wang, K. Terai, Y. Tomita, K. Hashimoto, N. Osawa

Proc. 12nd International Offshore and Polar Engineering Conference　2002/05　Research paper (international conference proceedings)

Study on Estimation Method of Heat Transfer during Line Heating Process by using Inverse Heat Conduction Analysis

Kiyoshi Matsuoka, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto

J. Kansai Soc. Naval Architects, Japan, 237,pp.255-261　2002/03　Research paper (scientific journal)

Study on Mathematical Model for Turbulent Combustion in the Impinging Jet Flame during Line Heating Process

Junji Sawamura, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto

Proceedings of the International Offshore and Polar Engineering Conference　Vol. 12　p. 247-252　2002　Research paper (international conference proceedings)

Study on Heat Transfer Phenomena between the Combustion Flow Field and the Heating Plate during Line Heating Process (3rd Report)

Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto

J. Soc. Naval Architects, Japan, 190, pp. 479-488　Vol. 190　p. 479-488　2001/12　Research paper (scientific journal)

Study on Combustion Analysis in the Impinging Jet Flame during Line Heating Process

Junji Sawamura, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto

J. Soc. Naval Architects, Japan, 190, pp. 489-497　No. 190　p. 489-497　2001/12　Research paper (scientific journal)

Study on Fatigue Crack Initiation Process by Using Crystalline FEM Analysis (4th Report)

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto

J. Soc. Naval Architects, Japan, 190, pp. 539-551　No. 190　p. 539-551　2001/12　Research paper (scientific journal)

The Study of Fatigue Design Method based on Fatigue Crack Growth Analysis

Koji Terai, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa

J. Soc. Naval Architects, Japan, 190, pp. 531-557　No. 190　p. 531-537　2001/12　Research paper (scientific journal)

Study on Heat Transfer between Gas Flame and Plate during Line-heating Process

Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Nobutaka Shinkai, Junji Sawamura

Proc. 8th Symposium on Practical Design of Ships and Other Floating Structures, pp. 389-396　2001/09　Research paper (international conference proceedings)

Fatigue Design Method of Ship Structural Members Based on Fatigue Crack Growth Analysis

K. Terai, Y. Tomita, K. Hashimoto, N. Osawa

Proc. 11th International Offshore and Polar Engineering Conference, IV, pp. 589-594　2001/06　Research paper (international conference proceedings)

Experimental Study on Thermo-Flow Field during Gas Flame Heating

Nobutaka Shinkai, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura

Proc. 11th International Offshore and Polar Engineering Conference, IV, pp. 595-601　2001/05　Research paper (international conference proceedings)

A Study on Fatigue Crack Growth under Considering Coalescence of Multiple Surface Cracks

YeHong Wang, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Koji Terai

Proc. 15th Asian Technical Exchange and Advisory Meeting on Marine Structures, pp. 319-328　Vol. 319　2001/05

Study on Heat Transfer Phenomena between the Combusion Flow Field and the Heating Plate during Line Heating Process (2nd Report)

Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Nobutaka Shinkai, Junji Sawamura, Daisen Tsubouchi(Choryo Design Lt, Yoshihiro Deguchi, Mitsubishi Heavy Industries

J. Soc. Naval Architects, Japan, 188, pp. 579-587　2000/12　Research paper (scientific journal)

Study on Analysis of Thermo-Flow Field in Moving at Heat Source during Line-Heating Process S

Nobutaka Shinkai, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura

J. Kansai Soc. Naval Architects, Japan, 234, pp. 229-235　No. 13　p. 125-128　2000/09　Research paper (scientific journal)

Fatigue Strength Evaluation of Ship Structural Members based on Fatigue Crack Growth Analysis

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Kouji Terai

Proc. the International Conference on Ship and Shipping Research (NAV2000), pp. 10.4.1-10.4.11　2000/09

Study on Constitutive Model of Cycling Hardening Process

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto

Proc. 13th European Conference on Fracture, pp. D7.1-D7.8　2000/09

Study on Heat Transfer Phenomena between the Combusion Flow Field and the Heating Plate during Line Heating Process

Junji Sawamura, Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Nobutaka Shinkai

J. Soc. Naval Architects, Japan, 187, pp. 373-381　Vol. 190　No. 190　p. 479-488　2000/06　Research paper (scientific journal)

Study of FEM Simulation of Cyclic Plastic Behavior of Face-Centered Cubic Crystal (F.C.C.) Crystalline Materials: 4th Report

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto

Proc. 9th International Offshore and Polar Engineering Conference (ISOPE-2000), IV, pp. 195-202　2000/05　Research paper (international conference proceedings)

Numerical Analysis of Heat Flux on Combustion Flow Field During Line-Heating Process -1st Report: Heat Flux for Spot Heating

Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Junji Sawamura, Nobutaka Shinkai

Proc. 9th International Offshore and Polar Engineering Conference (ISOPE-2000), IV, pp. 156-160　2000/05　Research paper (international conference proceedings)

Study on Simulation of Cyclic Plastic Behavior of Ship Structural Polycrystalline Metallic Materials under Cyclic Loading Conditions (6th Report) ---Calculation of Cyclic Slip Deformation Behavior based on the Micro mechanical Dislocation Model ---

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Nobuyuki Yamaga, Reiko Yamada

J. Kansai Soc. Naval Architects, Japan, 233, pp. 135-140　No. 233　p. 135-140　2000/03　Research paper (scientific journal)

Study on Fatigue Crack Initiation Process by Using Crystalline FEM Analysis (3rd Report)

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Nobuyuki Yamaga, Reiko Yamada

J. Soc. Naval Architects, Japan, 186, pp. 535-544　No. 186　p. 535-544　1999/12　Research paper (scientific journal)

Numerical Simulation of Magnetic Hysteresis Properties Based on Landau-Lifshiz-Gilbert Equation

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Yasuo Yamada

Proc. 5th Far-East Conference on Nondestructive Testing (FENDT'99), pp. 137-144　1999/11

Numerical Analysis of Combustion Flow Field during Line-Heating Process

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Junji Sawamura, Nobutaka Shinkai

J. Kansai Soc. Naval Architects, Japan, 232, pp. 155-161　No. 232　p. 155-161　1999/09　Research paper (scientific journal)

Study on Approximate Method to Analyze Thermo-Flow Field During Line-Heating Process

Yasumitsu Tomita, Naoki Osawa, Kiyoshi Hashimoto, Nobutaka Shinkai

Proc. 9th International Offshore and Polar Engineering Conference (ISOPE-99), IV, pp. 181-186　1999/06　Research paper (international conference proceedings)

Study of FEM Simulation of Cyclic Plastic Behavior of Face-centered Cubic Crystal (F.C.C.) Crystalline Materials: 3rd Report

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto

Proc. 9th International Offshore and Polar Engineering Conference (ISOPE-99), IV, pp. 140-145　1999/06　Research paper (international conference proceedings)

Study on Fatigue Crack Initiation Process by Using Crystalline FEM Analysis (2nd Report)

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Katsuya Matsuda, Nobuyuki Yamaga, Reiko Yamada

J. Soc. Naval Architects, Japan, 185, pp. 283-292　No. 185　p. 283-292　1999/06　Research paper (scientific journal)

Study on Fatigue Crack Initiation Process by Using Crystalline FEM Analysis (1st Report)

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Katsuya Matsuda, Nobuyuki Yamaga

J. Soc. Naval Architects, Japan, 184, pp. 347-359　No. 184　p. 670-671　1998/12　Research paper (scientific journal)

Study on Approximate Analysis of Convective Heat Transfer during Line-Heating Process

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Mitsuaki Yoshikawa, Sumitomo Heavy, Industries, Lt, Masafumi Yorozu, Sumitomo Heavy, Industries, Lt, Nobutaka Shinkai, Atsuhiko Kanada

J. Soc. Naval Architects, Japan, 184, pp. 465-472　No. 184　p. 465-472　1998/12　Research paper (scientific journal)

Study of FEM Simulation of Cyclic Plastic Behavior of Face-Centered Crystal (F.C.C.) Polycrystalline Materials: 2nd Report

Naoki Osawa, Yasumitsu Tomita, Kiyoshi Hashimoto, Katsuya Hirose

Proc. 8th International Offshore and Polar Engineering Conference (ISOPE-98), Vol. IV, pp. 347-352　1998/05　Research paper (international conference proceedings)

Study on the Expert System of Fairing Work

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Tomoyoshi Tanida(Kawasaki Heavy, Industries, Lt, Yoshio Kozuki(Kawasaki Heavy, Industries, Lt, Hidekazu Matsuura, Yasuo Yamada

J. Kansai Soc. Naval Architects, Japan,229,pp. 173-179　1998/03　Research paper (scientific journal)

Study on Simulation of Cyclic Plastic Behavior of Ship Structural Crystalline Metallic Materials under Cyclic Loading Conditions (4th Report)

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Taisuke Miyazono, Daisuke Ban

J. Kansai Soc. Naval Architects, Japan,229,pp. 163-172　No. 229　p. 163-172　1998/03　Research paper (scientific journal)

Study on Heat Transfer between Gas Flame and Steel Plate during Line Heating Process

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Nobutaka Shinkai, Junji Sawamura

J. Kansai Soc. Naval Architects, Japan,229,pp. 181-187　1998/03　Research paper (scientific journal)

Study of Deformation Mechanism and Strength Characteristics of Ship Structural Materials under Cyclic Loading Conditions (4th Report)

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Daisuke Ban, Taisuke Miyazono

J. Soc. Naval Architects, Japan,182,pp. 741-750　No. 182　p. 741-750　1997/12　Research paper (scientific journal)

Effects of Static Load on Fatigue Strength of Ship Structure

Wha Soo Kim, Hyndai Heavy, Industries Co, Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa

Proc. 7th International Offshore and Polar Engineering Conference, IV, pp. 565-571　Vol. 565　1997/05　Research paper (international conference proceedings)

Study of FEM Simulation of Cyclic Plastic Behavior of Face-Centered Crystal (F.C.C.) Polycrystalline Materials

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Taira Ozaki, Komatsu Co

Proc. 7th International Offshore and Polar Engineering Conference, IV, pp. 664-671　1997/05　Research paper (international conference proceedings)

Study on Simulation of Cyclic Plastic Behavior of Ship Structural Pollycrystalline Metallic Materials under Cyclic Loading Conditions (3rd Report) -- Calculation of F.C.C. Finite Deformation Rate-Dependent Model --

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Katsuya Hirose

J. Kansai Soc. Naval Architects, Japan, 227, pp. 95-107　No. 227　p. 95-107　1997/03　Research paper (scientific journal)

Material damping property of mild steel SS400B

Sadayoshi Chiaki, Yoshiteru Tanaka, Naoki Osawa, Kiyoshi Hashimoto

Proceedings of the International Conference on Offshore Mechanics and Arctic Engineering - OMAE　Vol. 1　p. 277-283　1997　Research paper (international conference proceedings)

Study of Deformation Mechanism and Strength Characteristics of Ship Structural Materials under Cyclic Loading Conditions (3rd Report)

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Taisuke Miyazono

J. Soc. Naval Architects, Japan, 180, pp. 499-507　No. 180　p. 499-507　1996/12　Research paper (scientific journal)

Study on Simulation of Cyclic Plastic Behavior of Ship Structural Pollycrystalline Metallic Materials under Cyclic Loading Conditions (2nd Report) -- Calculation of F.C.C. 3-dimensional model --

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Taira Ozaki, Kimatsu, Co. L

J. Kansai Soc. Naval Architects, Japan, 226, pp. 117-184　No. 226　p. 177-184　1996/09　Research paper (scientific journal)

Study of Relation between Stress-Strain Response and Fatigue Strength of Metal under Random Loading Conditions (1st Report)

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Yoichi Inada

J. Kansai Soc. Naval Architects, Japan, 225, pp. 201-208　No. 225　p. 201-208　1996/03　Research paper (scientific journal)

Study on Simulation of Cyclic Plastic Behavior of Ship Structural Pollycrystalline Metallic Materials under Cyclic Loading Conditions (1st Report)

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Taira Ozaki

J. Kansai Soc. Naval Architects, Japan, 225, pp. 209-218　No. 225　p. 209-218　1996/03　Research paper (scientific journal)

Nondestructive estimation of fatigue damage for steel by Barkhausen noise analysis

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa

NDT and E International　Vol. 29　No. 5　p. 275-280　1996　Research paper (scientific journal)

Non-destructive Estimation of Fatigue Damage for Steel by Balkhausen Noise Analysis

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa

Proc. 8th Asia-Pacific Conference on Non-destructive Testing, pp.421-428　p. 421-428　1995/12

Studies on the Expert System of Bending Work Using Line Heating

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Yanao Fukuda, Kawasaki Heavy, Industry Ltd, Yoshio Kozuki, Kawasaki Heavy, Industry Lt, Hiroki Wakita

J. Kansai Soc. Naval Architects, Japan, 224, pp. 121-130　Vol. 223　p. 89-94　1995/09　Research paper (scientific journal)

study of fatigue limit under variable-amplitude loading conditions

Yasumitsu Tomita, Kiyoshi Hashimoto, Naoki Osawa, Yoshihiro Nakamura

Proceedings of the Third (1993) International Offshore and Polar Engineering Conference　p. 48-55　1993　Research paper (international conference proceedings)