Go Ozeki
Tohoku University
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Publication
Featured researches published by Go Ozeki.
Strength, fracture and complexity | 2015
Go Ozeki; A. Toshimitsu Yokobori; Ryuji Sugiura; Michifumi Ito
Ni-base directionally solidified superalloy are used under complex conditions of high temperature creep and fatigue interaction. Under these conditions, the characteristics of load frequency for fracture life show a nonlinear behavior, and these characteristics show various features depending on material, temperature and stress holding time. In this study, crack growth tests were conducted under creep-fatigue interactive conditions with stress holding time, tH using the in-situ observational system for directionally solidified Ni-base superalloy CM247LC. To characterize the load frequency of fracture life for CM247LC, the separate estimation of cyclic dependent from time dependent mechanisms was conducted. Additionally, a developed representation of the characteristic of fracture life under the conditions of creep fatigue interaction based on non-equilibrium science and chaos theory was proposed. Furthermore, verification of the established law of predicting the fracture life under creep-fatigue interactive conditions was conducted.
ASME 2013 Pressure Vessels and Piping Conference | 2013
Go Ozeki; Ryuji Sugiura; A. Toshimitsu Yokobori; Yoshiko Nagumo; Hiroaki Takeuchi; Takashi Matsuzaki
Ni-base directionally solidified superalloy strengthened by γ′ precipitates have been developed as a gas turbine blade. However, it is difficult to detect creep damage such as creep voids by conventional observation techniques. It is important to clarify the creep damage behavior for Ni-base superalloy.In this study, creep crack growth tests for Ni-base directionally solidified superalloy CM247LC were conducted using the in-situ observational system. Additionally, the metallographical investigation was conducted on crept specimen using EBSD analysis and relationship between creep crack growth path and material microstructure were clarified. And, in order to clarify the difference of creep crack growth behavior, the designed two-dimensional elastic-plastic creep finite element analyses were conducted for the model with grain distribution obtained by EBSD analysis.Copyright
Advanced Materials Letters | 2018
Go Ozeki; A. Toshimitsu Yokobori; Toshihito Ohmi; Tadashi Kasuya; Nobuyuki Ishikawa; Satoshi Minamoto; Manabu Enoki
Strength, fracture and complexity | 2017
Go Ozeki; A. Toshimitsu Yokobori; Toshihiro Endo; Fumio Sato; Toshihito Ohmi; Kazuto Sato
Volume 5: High-Pressure Technology; Rudy Scavuzzo Student Paper Symposium and 24th Annual Student Paper Competition; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); Electric Power Research Institute (EPRI) Creep Fatigue Workshop | 2016
Go Ozeki; A. Toshimitsu Yokobori; Takashi Matsuzaki
The Proceedings of the Materials and Mechanics Conference | 2016
A. Toshimitsu Yokobori; Go Ozeki; Yoshiko Nagumo
The Proceedings of the Materials and Mechanics Conference | 2016
Go Ozeki; A. Toshimitsu Yokobori
The Proceedings of Mechanical Engineering Congress, Japan | 2015
Go Ozeki; Toshimitsu Yokobori; Yoshiko Nagumo; Ryuji Sugiura
Journal of Solid Mechanics and Materials Engineering | 2012
Yoshiko Nagumo; A. Toshimitsu Yokobori; Ryuji Sugiura; Go Ozeki; Takashi Matsuzaki
The Proceedings of Conference of Tohoku Branch | 2011
Go Ozeki; Ryuji Sugiura; Yoshiko Nagumo; Hiroaki Takeuchi; Takashi Matsuzaki; A. Toshimitsu Yokobori
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