On the transition from void collapse to void coalescence

Abstract eng:
Void behavior of a ductile solid subjected to deformations with low or negative triaxiality (void collapse) is different from that with high triaxiality (void coalescence). We examine the critical strain-to-onset of void collapse and void coalescence via homogenizationbased micromechanics analyses. Cells are subjected to a full range of the Lode parameter L and triaxiality T are obtained. Numerical results show that the loci are discontinuous functions of T , with the existences of transition zone separating loci of strain-to-onset of void collapse and that of void coalescence; within the zones neither of the two void behaviors is predicted at low triaxiality. Stress state dependence of void collapse and void coalescence are investigated and presented in the form of charts, analogous to phase diagrams; they illustrate and distinguish clearly, in the T − L space, regions in which void collapse, void coalescence and neither of the two are possible.

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