Crack branching in delayed failure

✍ Scribed by K. Nakasa; H. Takei

• Book ID: 103068503
• Publisher: Elsevier Science
• Year: 1979
• Tongue: English
• Weight: 694 KB
• Volume: 11
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(79)90133-4

✦ Synopsis

The condition for crack branching in delayed failure was investigated on the basis of energy consideration, and the effect of diffusion behavior of hydrogen atoms on the crack branching was discussed.

The branching angle predicted from the present theory well agreed with the experimental value. The stress intensity factor at crack branching, Kis, is dependent on the diffusion velocity of hydrogen atoms, i.e. branching appears to occur when the moving velocity of the position with tri.axial tensile stress reaches the upper limit value of diffusion velocity of hydrogen atoms. The time to crack growth initiation is actually independent of stress intensity factor when the cracl~ branching occurs, probably because the diffusion velocity of hydrogen atom has a certain upper limit value.