期刊
ENGINEERING FRACTURE MECHANICS
卷 243, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2020.107471
关键词
Crack-tip plasticity; Crack plane displacement; Theoretical modeling; Distributed dislocation technique; Mixed loads; Strain-hardening material
类别
资金
- Material Analysis and Testing Center Office Security Funds [X200191TL200]
- Guangdong Basic and Applied Basic Research Foundation [X200211TL201]
This paper presents a new theoretical model for crack-tip plasticity, suitable for bilinear strain-hardening and perfectly-plastic materials under mixed loads. The developed models are shown to be suitable for strain-hardening materials under mixed loads through comparison with finite element simulations, representing a new progression in the theoretical modeling of crack-tip plasticity.
The crack growth behavior is influenced greatly by the crack-tip plasticity. Most of the existing two-dimensional (2D) theoretical models of crack-tip plasticity are appropriate only for elastic perfectly-plastic materials under simple mode load, which limits the application range. This paper presents a theoretical model based on the distributed dislocation technique (DDT) that can be used at mixed loads with bilinear strain-hardening and perfectly-plastic materials. The problem of a half plane containing an edge crack under uniaxial tensile load or mixed loads is considered in both 2D limit cases: plane stress and plane strain. The theoretical modeling results are compared with finite element simulations. The results show the developed models are suitable for strain-hardening materials under mixed loads, which is a new progress in the theoretical modeling of crack-tip plasticity.
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