期刊
ENGINEERING FRACTURE MECHANICS
卷 182, 期 -, 页码 32-51出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfracmech.2017.06.025
关键词
Shell element; Ductile fracture; Domain of Shell-to-Solid Equivalence; Marciniak-Kuczynski analysis; Localized necking; Hosford-Coulomb; Mesh size sensitivity
类别
资金
- Industrial Fracture Consortium
The implementation of recent progress on stress state dependent ductile fracture models is inhibited by the break-down of shell element solutions whenever through-thickness necking occurs. The concept of the Domain of Shell-to-Solid Equivalence (DSSE) is therefore introduced to capture the onset of localized necking with shell element meshes. As long as the elasto-plastic loading paths lie inside the DSSE, ductile fracture may be predicted with shell elements using exactly the same models as for solid elements. A simple criterion describing the boundary of the DSSE is proposed based on the results from Marciniak-Kuczynski type of localization analysis. It is combined with the stress triaxiality and Lode angle dependent Hosford-Coulomb (HC) fracture initiation model and implemented as a user material subroutine for explicit finite element analysis. The combined DSSE-HC model is validated for a DP780 steel for notched tension, hemispherical punch loading, stretch bending, and V-bending of strips. (C) 2017 Elsevier Ltd. All rights reserved.
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