A finite element ductile failure simulation method using stress-modified fracture strain model

• Published in: Engineering fracture mechanics Vol. 78; no. 1; pp. 124 - 137
• Main Authors: Oh, Chang-Sik, Kim, Nak-Hyun, Kim, Yun-Jae, Baek, Jong-Hyun, Kim, Young-Pyo, Kim, Woo-Sik
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01-01-2011; Elsevier
• Subjects: Ductile fracture simulation; Exact sciences and technology; Finite element analysis; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); Physics; Solid mechanics; Stress-modified fracture strain; Structural and continuum mechanics; Stress-modified fracture strain; Ductile fracture simulation; Finite element analysis; Notched test piece; Bursting test; Structure integrity; Experimental study; Test bar; Modeling; Triaxial stress; Tension test; Finite element method; Ductile material; Ductile fracture; Crack
• ISSN: 0013-7944; 1873-7315
• DOI: 10.1016/j.engfracmech.2010.10.004

This paper proposes a new method to simulate ductile failure using finite element analysis based on the stress-modified fracture strain model. A procedure is given to determine the stress-modified fracture strain as a function of the stress triaxiality from smooth and notched bar tensile tests with FE analyses. For validation, simulated results using the proposed method are compared with experimental data for cracked bar (tensile and bend) tests, extracted from API X65 pipes, and for full-scale burst test of gouged pipes, showing overall good agreements. Advantages in the use of the proposed method for practical structural integrity assessment are discussed.