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J-GLOBAL ID：200901067504099100   Update date: Jul. 08, 2024

Niwa Toshio

ニワ トシオ | Niwa Toshio
Affiliation and department：
National Maritime Research Institute

About National Maritime Research Institute


Job title： Designated Principal Research
Research field  (1)： Marine and maritime engineering
Research keywords  (4)： Fracture Mechanics ,  Mechanics of Materials ,  Corrision ,  Fatigue Strength
Research theme for competitive and other funds  (19)：
  • 2016 - 2020 Effect of stress ratio on fatigue strength and thickness effect of weided joint improved by HFMI
  • 2016 - 2019 Improvement of Fatigue Strength by Laser Irradiation in the Hull Construction
  • 2014 - 2018 Noble estimation procedure of fatigue crack growth under in-plane biaxial or superimposed stress conditions
  • 2012 - 2015 Development of optimum treatment method in the fatigue strength improvement
  • 2012 - 2015 A fundamental study on fatigue life evaluation taking the load sequence of whipping into account.
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Papers (41)：
  • Shuichi Tsumura, Toshiaki Iwata, Toshio Niwa. Thickness effect on fatigue life of HFMI-treated welded joints under negative stress ratio. WELDING IN THE WORLD. 2023. 67. 9. 2261-2272
  • Hitoshi Hayashibara, Ryutaro Fueki, Norio Yamamoto, Tomohiro Sugimoto, Takahiro Ando, Shuichi Tsumura, Yosuke Anai, Chikahisa Murakami, Toshio Niwa, Toshiaki Iwata, et al. Surface Corrosion Fatigue Crack Growth Test in Accelerating Environment Where General Surface Corrosion Proceed in Parallel. Volume 3: Materials Technology; Pipelines, Risers, and Subsea Systems. 2023
  • Shuichi Tsumura, Yosuke Anai, Takahiro Ando, Toshiaki Iwata, Toshio Niwa. Improvement Effect of Fatigue Strength by HFMI Treatment under the Negative Stress Ratio Condition. Journal of the Japan Society of Naval Architects and Ocean Engineers. 2021. 34. 51-61
  • Yosuke Anai, Yoshihisa Tanaka, Toshio Niwa. Corrosion Fatigue Properties of High Tensile Steel Plates (YP40 steel) for a Ship Hull. Journal of Marine Science and Technology. 2020. 32. 109-115
  • M. Morishita, K. Gotoh, Y. Anai, S. Tsumura, T. Niwa. Fatigue surface crack growth behaviour in a flat plate and an out-of-plane gusset welded joints under biaxial cyclic loadings with different phases. Journal of Marine Science and Technology. 2020. 26. 1-18
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MISC (42)：
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Books (1)：
  • Fatigue Life Prediction for Steel Structures
    Kyoritsu Shuppan Co., Ltd.. 2001
Lectures and oral presentations  (14)：
  • A Study on Effect of Improvement in Fatigue Strength and the Thickness Effect by HFMI Treatment under Negative Stress Ratio Condition
    (Conference Proceedings, The Japan Society of Naval Architects and Ocean Engineers 2020)
  • A Study on Effect of Improvement in Fatigue Strength Effect by HFMI Treatment under Negative Stress Ratio Condition
    (Conference Proceedings, The Japan Society of Naval Architects and Ocean Engineers 2019)
  • Numerical Simulation of Fatigue Surface Crack Propagation under in-plane Biaxial Cyclic Loading with Different Phases
    (Conference Proceedings, The Japan Society of Naval Architects and Ocean Engineers 2018)
  • Shape Evolution of Fatigue Surface Crack under In-plain Biaxial Cyclic Loading
    (Conference Proceedings, The Japan Society of Naval Architects and Ocean Engineers 2017)
  • Thickness Effect on Fatigue Strength of Welded Joint Improved by UIT
    (The National Meeting of JWS 2017)
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Education (2)：
  • 1984 - 1986 Nagaoka University of Technology Graduate School of Engineering Mechanical System Engineering Division
  • 1982 - 1984 Nagaoka University of Technology Faculty of Engineering Mechanical Design and Production Engineering Department
Professional career (2)：
  • Doctor(Engineering) (Kyushu University)
  • Master of Engineering (Nagaoka University of Technology)
Work history (10)：
  • 2022/04 - 現在 National Maritime Research Institute Designated Principal Researcher
  • 2019/07 - 2022/03 National Maritime Research Institute Industrial System Engineering Department Director
  • 2018/04 - 2022/03 National Maritime Research Institute Senior Director for Research
  • 2016/04 - 2019/07 National Maritime Research Institute Core Manufacturing Technology Department Director
  • 2009/08 - 2019/07 National Maritime Research Institute Head of Research Group
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Awards (1)：
  • 2014/06 - OMAE2013 Best Paper Award Material Technology Symposium Fatigue crack propagation under biaxial tensile loading -Effect of the phase difference on biaxial loading-
Association Membership(s) (3)：
The Society of Materials Science, Japan ,  Japan Welding Sciety ,  The Japan Society of Naval Architects and Ocean Engineering
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