Crack Path Stabilisation and T-Stress Estimation in Connection with the Global Approach for Inclined Notches

摘要

In this paper, we investigate the effects of non-singular stress (T-stress) on the mixed mode loading (I + II) near notch-tip field's elastic compression-sensitive under plane stress and small scale yielding conditions. The crack path is estimated for three different shapes of notches using the Maximum Tangential Stress (MTS) approach. Constraint induced by the notch depth, shape of defaults and the notch-tip stress field in laboratory specimens is examined by Finite Element Analysis, and the effect of the deformation on modified (HRR) singularity stress field are discussed. The Volumetric Method (VM) criterion for compression and/or tension sensitive materials is described by a linear combination of the effective stress and the Notch Stress Intensity Factor. The results of our finite element computations based on a two-parameter fracture mechanics formulation show that the T stress has significant effects on the sizes, the shapes of the plastic zones and the crack path.