Fracture Mechanics Study on Stress Corrosion Cracking Behavior under Corrosive Environment

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概要

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• This paper deals with applicability of non-linear fracture mechanics to crack growth by stress corrosion cracking (SCC) under large-scale yielding and in a plastically deformed area. Crack growth test by compact tension specimen is carried out to evaluate crack growth rate under small-scale and large-scale yielding conditions. To evaluate the crack growth behavior from a crack initiated in a plastically deformed area, crack growth test is also carried out for a very short pre-crack in a plastically deformed four-point bending specimen. Conventional stress intensity factor (<I>K</I>) and equivalent stress intensity factor (<I>K</I><SUB>J</SUB>) defined by <I>J</I> integral are used as fracture mechanics parameters which characterize the crack growth rate. On <I>da/dt</I>-<I>K</I> diagram, a data band shows wide scatter, especially the crack growth rate in a plastically deformed area is higher than that under small-scale yielding condition. On the other hand, <I>da/dt</I>-<I>K</I><SUB>J</SUB> diagram exhibits narrower scatter on a data band than <I>da/dt</I>-<I>K</I> diagram. The equivalent stress intensity factor is appropriate for characterization of crack growth rate by SCC under small-scale yielding through large scale yielding conditions and in a plastically deformed area.

著者

• Tohgo Keiichiro

  Department Of Iron And Steel Engineering Nagoya University

• Fujii Tomoyuki

  Department Of Applied Biological Chemistry The University Of Tokyo

• Shimamura Yoshinobu

  Department Of Mechanical Engineering And Science Tokyo Institute Of Technology

• HIRANO Takashi

  Nuclear Power Division, IHI Corporation

• ISHIZUKA Naohiro

  Graduate School of Engineering, Shizuoka University

• TAKANASHI Masahiro

  Research Laboratory, IHI Corporation

• ITABASHI Yu

  Research Laboratory, IHI Corporation

• NAKAYAMA Gen

  Research Laboratory, IHI Corporation

• SAKAKIBARA Yohei

  Research Laboratory, IHI Corporation

• Nakayama Gen

  Research Institute, Ishikawajima-Harima Heavy Industries Co., Ltd.

• FUJII Tomoyuki

  Department of Mechanical Engineering, Shizuoka University

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