granules;  composite materials;  Interface: damage;  Micromechanics;  Modulus of elasticity

In order to predict the effective elastic properties of granular reinforced composites with interfacial debonding, a spherical particle composite model with defective interface was established by Eshelby micromechanical theory and Dvorak transformation field analysis (TFA), and the effective tangential modulus and total secant modulus of three-phase granular composites were given. Based on the Weibull probability function, a damage model is established to describe the evolution of the weakened interface between particles and substrates. Using the verification of literature experimental data, reasonable model parameters were selected, and the numerical test results were compared with the experimental results to prove the rationality of the micromechanical elastic damage model.