Effects of temperature, initial stress intensity factor and loading speed on the crack branching in delayed failure

✍ Scribed by Nakasa Keijiro; Takei Hideo; Yoshida Motoharu

• Publisher: Elsevier Science
• Year: 1980
• Tongue: English
• Weight: 951 KB
• Volume: 13
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(80)90095-8

✦ Synopsis

The relation between diffusion behavior of hydrogen atoms and crack branching in delayed failure was discussed.

The hypotheses that diffusion paths of hydrogen atoms at crack tip broaden with increase of stress intensity factor K, and that crack branching occurs when hydrogen atoms diffuse through the position where stable cracks are to nucleate, can well explain the facts that crack branching occurs when K reaches to a certain value, K,,, and that K,, increases with increase of temperature. The initial stress intensity factor and loading speed do not actually influence K,,, which can also be explained by the above hypotheses.