期刊
COMPUTATIONAL MECHANICS
卷 57, 期 1, 页码 149-167出版社
SPRINGER
DOI: 10.1007/s00466-015-1225-3
关键词
Phase-field model; Finite strains; Ductile fracture; Elasto-plastic solids; Finite element
资金
- European Research Council, ERC [279439]
In this paper, a phase-field model for ductile fracture previously proposed in the kinematically linear regime is extended to the three-dimensional finite strain setting, and its predictions are qualitatively and quantitatively compared with several experimental results, both from ad-hoc tests carried out by the authors and from the available literature. The proposed model is based on the physical assumption that fracture occurs when a scalar measure of the accumulated plastic strain reaches a critical value, and such assumption is introduced through the dependency of the phase-field degradation function on this scalar measure. The proposed model is able to capture the experimentally observed sequence of elasto-plastic deformation, necking and fracture phenomena in flat specimens; the occurrence of cup-and-cone fracture patterns in axisymmetric specimens; the role played by notches and by their size on the measured displacement at fracture; and the sequence of distinct cracking events observed in more complex specimens.
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