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 thestresses in the vicinity of the crack tip. The singular stresscontribution is characterized by stress intensity factors. The stressintensity factors depend on the geometry of the component and onloading condition. This paper addresses the evaluation of stressintensity factors (SIFs) of opening, shearing and tearing modes forcompact tension specimens for bonding homogeneous materials. Theaim of this work is to find the optimal pre-cracked length, cracknotch radius and crack notch angle in order to eliminate the effect ofthem on the SIF and then on the Fracture toughness. To achieve thisgoal, a three-dimension finite element analysis (FEA) model usingANSYS program is constructed for specimens made of homogeneousmaterials such as stainless steel bonding with epoxy as a fillermaterial. The effects of notch angle, notch tip radius and pre-cracklength on the stress intensity factors are studied for different fracturemodes. The results for the stress intensity factors KI , KII and KIII areobtained using linear elastic fracture mechanics (LEFM) approach