STUDY ON THE ENERGY RELEASE RATE FOR THE PARTICLE/MATRIX INTERFACE AND CRITICAL PARTICLE SIZE OF FUNCTIONALLY GRADIENT MATERIALS

The study on the energy release rate for cracks propagating of particle and matrix interface in Functionally Gradient Materials (FGM) was carried out. The thermal stress for the matrix particle interface was calculated using Double Layer Embedment model, also the relation between the stress and metal volume fraction was obtained,and then the energy release rate and the change of critical particle size(radius) in the graded layers were given.