Three-Dimensional Finite Element Model for Evaluation the Stress Intensity Factors for Different Fracture Modes of Homogeneous Bimaterial

Abstract

The failure of cracked components is governed by the stresses in the vicinity of the crack tip. The singular stress contribution is characterized by stress intensity factors. The stress intensity factors depend on the geometry of the component and on loading condition. This paper addresses the evaluation of stress intensity factors (SIFs) of opening, shearing and tearing modes for compact tension specimens for bonding homogeneous materials. The aim of this work is to find the optimal pre-cracked length, crack notch radius and crack notch angle in order to eliminate the effect of them on the SIF and then on the Fracture toughness. To achieve this goal, a three-dimension finite element analysis (FEA) model using ANSYS program is constructed for specimens made of homogeneous materials such as stainless steel bonding with epoxy as a filler material. The effects of notch angle, notch tip radius and pre-crack length on the stress intensity factors are studied for different fracture modes. The results for the stress intensity factors KI , KII and KIII are obtained using linear elastic fracture mechanics (LEFM) approach.