I-DIC-based identification strategy of failure criteria: application to titanium and nickel-based alloys

摘要

Integrated digital image correlation (I-DIC) is used to probe three different failure criteria on two high performance alloys. The approach consists of two steps. First, the mechanical state of each analyzed test is determined as best as possible by calibrating the parameters of a given elastoplastic law. Thin and thick samples are studied, which induce totally different states of equivalent plastic strain. Second, the state of stresses on the actual fractured surface is assessed by post-processing the 3D finite strain simulations of the I-DIC framework. These data are used to analyze different local criteria. It is found that a maximum eigen stress criterion is well adapted to the studied materials.