A bifailure specimen for accessing failure criteria performance

Many engineering ductile materials, such as metals, show inelastic behavior with corresponding large deformations. For these materials, the prediction of failure, defined as local material separation, is still nowadays a scientific challenge. Failure initiation, its locus and evolution, has been discussed extensively in recent literature. This work presents a bifailure specimen, especially developed to evaluate failure criteria at high and low triaxiality. In order to explore further the failure phenomenon, uncoupled models are numerically implemented in an explicit finite element code. Simulations were performed and do indicate that, for the studied examples, uncoupled models are not capable of correctly predicting failure. (C) 2015 Elsevier Ltd. All rights reserved.