A calculation model and boundary element method simulation for 3-D blunt cracks

✍ Scribed by Yongyuan Zhang; Guohua Ruan

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 541 KB
• Volume: 47
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(94)90090-6

✦ Synopsis

Al&met-The boundary element method (BEM) simulation for 3-D blunt crack problems is studied. A calculation model for 3-D blunt cracks is established based on the plane strain analogy. The displacement and stress fields near the crack front are calculated by a 3-D BEM computer program and then the stress intensity factor (SW) along the crack front can be obtained using the crack tip opening displacement. Both the validation of the model and convergence of the grid pattern are examined numerically. The SIF values are calculated for 3-D plates with a through blunt crack and a surface blunt crack. The results show that when p/a Q 0.1 the model is valid, and furthermore when p/a d 0.03 a blunt crack is nearly equivalent to a sharp crack. When P/U > 0.1, however, the model is invalid and the stress concentration factor (SCF) of a 3-D notch is useful.