Research field (2)：
Material fabrication and microstructure control
, Machine materials and mechanics
Research keywords (7)：
Hydrogen embrittlement
, Metal fatigue
, FEM
, 疲労限度
, 材料強度学
, 共振疲労
, Fracture mechanics
Research theme for competitive and other funds (2)：
2019 - 2022 Mechanism of hydrogen-induced creep in precipitation-hardened Ni-based superalloys
2017 - 2019 Mechanism of shear-mode fatigue fracture on precipitation hardened alloys used for high pressure hydrogen environment
Papers (33)：
Sungcheol Park, Yuya Tanaka, Saburo Okazaki, Yusuke Funakoshi, Hideto Kawashima, Hisao Matsunaga. Role of grain boundaries and precipitates in small, fatigue crack-growth resistance of additively-manufactured, Ni-based superalloy 718 under torsional cyclic loading. Materials Letters. 2023. 350
Yuya Tanaka, Sungcheol Park, Saburo Okazaki, Hisao Matsunaga. Criteria for determining the fatigue limit of Ni-based superalloy 718, considering the competition between opening- and shear-mode fatigue crack-growth. Engineering Fracture Mechanics. 2023. 109500-109500
Sungcheol Park, Yuya Tanaka, Saburo Okazaki, Yusuke Funakoshi, Hideto Kawashima, Hisao Matsunaga. Inferior fatigue resistance of additively-manufactured Ni-based superalloy 718 and its dominating factor. International Journal of Fatigue. 2023. 107801-107801
Naoaki Nagaishi, Yuhei Ogawa, Saburo Okazaki, Hisao Matsunaga. Fatigue limit of circumferentially notched metastable austenitic stainless steel under positive/negative stress ratios: Synergistic effects of notch-root mechanistic singularity and phase transformation. International Journal of Fatigue. 2022. 165. 107229-107229
Yuhei Ogawa, Keiichiro Iwata, Saburo Okazaki, Masami Nakamura, Kazuki Matsubara, Osamu Takakuwa, Hisao Matsunaga. Fatigue crack-growth retardation after overloading in gaseous hydrogen: Revisiting the effect of hydrogen on crack-tip plastic-zone development. Materials Letters. 2022. 308
Yuhei Ogawa, Osamu Takakuwa, Saburo Okazaki, Saburo Matsuoka, Hisao Matsunaga. Change of crack initiation and propagation modes in hydrogenrelated failure of a precipitation-strengthened NI-based superalloy 718 under internal and external hydrogen conditions. American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP. 2019. 6B-2019
Kevinsanny, Saburo Okazaki, Osamu Takakuwa, Yuhei Ogawa, Koichi Okita, Yusuke Funakoshi, Junichiro Yamabe, Saburo Matsuoka, Hisao Matsunaga. Effect of defects and hydrogen on the fatigue limit of Ni-based superalloy 718. Procedia Structural Integrity. 2019. 19. 312-319
NAKAMURA Masami, OKAZAKI Saburo, SATO Shinji, OGAWA Yuhei, SATO Toyoyuki, TANAKA Shunya, MATSUNAGA Hisao, MATSUOKA Saburo. Effect of hydrogen on SSRT fracture process of 309Mo and 309LMo weld metals. Preprints of the National Meeting of JWS. 2019. 2019. 0. 18-19
Change of crack initiation and propagation modes in hydrogen-related failure of a precipitation-strengthened Ni-based superalloy 718 under internal and external hydrogen conditions
(2019)
