Elastic-plastic fracture analysis of finite bodies—II. Conditions of fracture initiation

✍ Scribed by Ma Fashang; Kuang Zhen-Bang

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 697 KB
• Volume: 48
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(94)90180-5

✦ Synopsis

The normal and triaxial stresses on untracked ligament for different specimens were analyzed by large deformation plane strain finite element analysis (FEM) at their fracture loads, and the critical characteristic parameters (J. Q, k) of the stress field established in Part I [Fashang Ma and Zhen-Bang Kuang, En,qr:ng Fracfurc Mech. 48, 7277737 (1994)] were determined by fitting. Using several continuum damage mechanics (CDM) models and the present stress field, the conditions of the initiation of elasticcplastic

fracture growth for different specimens were discussed in detail, and it was verified by experimental data that the critical conditions suggested in this paper are independent of specimen geometry and of the ratios of crack depth a to specimen width )1' when an appropriate microscopic model for fracture initiation is adopted. When characteristic parameters of the stress field k = I and Q = 0, the present conditions will reduce to the well-known elastic-plastic single parameter fracture criteria.