Micromechanical modeling of void coalescence in ductile solids

Abstract eng:
Recent extensions of an analytical micromechanics-based model for the coalescence of micron scale cavities in ductile materials are reported. For predominately tensile loading, two improved upper-bound models are obtained by considering alternative velocity fields in the limit analysis approach. For combined tension and shear loading, an extension of the original model employing a discontinuous velocity field is presented. Finally, a framework is laid out to develop macroscopic yield criteria for porous ductile solids accounting simultaneously for void growth and coalescence. Here again, solutions are obtained for axially symmetric tensile as well as non-axisymmetric loadings. In all cases, model predictions are compared with supposedly exact results obtained by an efficient method of finite-element based limit analysis.

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