Dependence of sub-critical crack growth on effective stress intensities

✍ Scribed by P.J. Noronha; P.F. Packman

• Publisher: Elsevier Science
• Year: 1978
• Tongue: English
• Weight: 580 KB
• Volume: 10
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(78)90012-7

✦ Synopsis

Abetraet-Sub-criticaI crack growth in hii strength steels exhibit three regions of growth rates. In region I aad II1 the growth is dependent on the stress intensity (computed for a sharp crack tip), while in region II the growth rate appears insensitive to the stress intensity. An investigation of the behavior in region II indicates that the insensitivity may be due to blunting of the crack tip resulting in a lower effective stress intensity. Based on experimental results a ratio for approximation of the effective stress intensity at the crack tip is proposed, and the cause of the anomalous behavior in region II is suggested.