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- Title
Unified characterisation of in-plane and out-of-plane constraint based on crack-tip equivalent plastic strain.
- Authors
YANG, J.; WANG, G. Z.; XUAN, F. Z.; TU, S. T.
- Abstract
ABSTRACT Constraint can be divided into two conditions of in-plane and out-of-plane, and each of them has its own parameter to characterize. However, in most cases, there exists a compound change of both in-plane and out-of-plane constraint in structures, a unified measure that can reflect both of them is needed. In this paper, the finite element method (FEM) was used to calculate the equivalent plastic strain ( ɛp) distribution ahead of crack tips for specimens with different in-plane and out-of-plane constraints, and the FEM simulations based on Gurson-Tvergaard-Needleman (GTN) damage model and a small number of tests were used to obtain fracture toughness for the specimens with different constraints. Unified measure and characterisation parameter of in-plane and out-of-plane constraints based on crack-tip equivalent plastic strain has been investigated. The results show that the area APEEQ surrounded by the ɛp isoline ahead of crack tips can characterize both in-plane and out-of-plane constraints. Based on the area APEEQ, a unified constraint characterisation parameter Ap was defined. It was found that there exists a sole linear relation between the normalised fracture toughness JIC/Jref and regardless of the in-plane constraint, out-of-plane constraint and the selection of the ɛp isolines. The unified JIC/ Jref−reference line can be used to determine constraint-dependent fracture toughness of materials. The FEM simulations with the GTN damage model (local approach) can be used in obtaining the unified JIC/ Jref−reference line for materials with ductile fracture.
- Subjects
SURFACE cracks; CONSTRAINTS (Physics); FRACTURE mechanics; DAMAGE models; SIMULATION methods &; models
- Publication
Fatigue & Fracture of Engineering Materials & Structures, 2013, Vol 36, Issue 6, p504
- ISSN
8756-758X
- Publication type
Article
- DOI
10.1111/ffe.12019