Experimental and numerical study of progressive failure of ductile metals

The investigation of progressive failure of ductile metals is valuable for accelerating the application of ductile metals and reducing the physical experiments burden. In this paper, a modified three-stress-invariant ductile fracture model is proposed based on continuum damage mechanics, where the e...

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Bibliographic Details
Published in:Hang kong cai liao xue bao 2013-02, Vol.33 (1), p.93-99
Main Authors: Liu, Chao, Sun, Qin, Liu, Yan-Jie, Fan, Xue-Ling
Format: Article
Language:Chinese
Subjects:
Crack initiation
Damage
Ductile fracture
Ductility
Failure
Finite element method
Mathematical analysis
Mathematical models
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Summary:The investigation of progressive failure of ductile metals is valuable for accelerating the application of ductile metals and reducing the physical experiments burden. In this paper, a modified three-stress-invariant ductile fracture model is proposed based on continuum damage mechanics, where the effects of hydrostatic pressure and Lode angle on damage variable are considered. To predict the progressive failure behavior of ductile metals, a series of experiments have been conducted for high strength aluminum 2A12-T4 sheets and the proposed model is implemented into quasi-static finite element method through a compilation of user's material subroutine VUMAT of the commercial finite element platform ABAQUS. The ductile fracture model is validated by comparing between experimental data and numerical results. It is shown that the proposed ductile fracture model can accurately and effectively predict the whole damage process of ductile metals including crack initiation, propagation and final fracture.
ISSN:1005-5053
DOI:10.3969/j.issn.1005-5053.2013.1.016