CRACK EXTENSION UNDER MIXED MODE LOADING AT V-NOTCH TIP - PERIDYNAMIC ANALYSIS

摘要

Crack extension is a challenging problem in structural analysis. For homogeneous material, several criteria for crack extension have been developed in the past few decades. The aim of such criteria is to predict the crack nucleation, crack path and the crack stability within a stress concentration region due to geometrical singularity or even a preexisted crack tip. We can name several of these criteria: Maximum hoop stress criterion, Crack Tip Opening (Shear) Displacement CTOD, CSTD, and the most used J integral. These criteria are frequently used as associated to Finite Elements (FE) simulation in order to predict the crack extension. However, the relevance of each criterion in crack path prediction is still a matter of debate in mixed modes (I+II) crack extension and especially when the Mode II shear fracture is dominating. In the other hand, the new development in discrete elements (DE) simulation allows one to observe spontaneous cracks initiation and growth in a solid, without the need of a specific local criterion as in FE simulation.