FINITE ELEMENT METHOD STUDY OF THE CRACK/CAVITY INTERACTION IN THE BI-MATERIALS

Abstract The objective of this study is to numerically analyze, using the finite element method (FEM), the effect of a spherical cavity located at the center of the interface between metal and ceramic materials, then at the metal level and finally at the ceramic level. The analysis focuses on evaluating the J-integral along the crack front as a function of the crack size and cavity diameter at the interface. Additionally, the study explores how the position of the defect relative to the interface and its location concerning the crack plane influences the stress distribution. Finite element simulations are performed to calculate the J-integral and the size of the plastic zone at a crack perpendicular to and terminating at a metal/alumina interface. This research provides valuable insights into the mechanical behavior of the interface, offering implications for the design and durability of bi-material structures.