Micromechanical predictions of thermo-mechanical properties of sintered composites

摘要

The thermo-mechanical properties of sintered composite materials are analyzed theoretically and the predictions are compared with experimental data. The theory used here is based on Eshelbys equivalent inclusion method, which allows solving the three-dimensional elastic problem by assuming ellipsoidal fillers to be embedded in an infinite elastic body. The analytical model for the calculations was constructed starting from the accurate microstructural observation of the composites microstructure. With this model, we analyzed how the thermal and mechanical properties of a composite depend on the volume fraction of the fillers, defects (pores, cracks and interface debonding between matrix and fillers), the orientation of the fillers and the residual stress in the matrix induced by the mismatch of the thermal expansion coefficients of the matrix and the fillers, and the shape memory-effect of the fillers. The theoretical predictions arc in good agreement with the experimental data, and help us to understand the thermo-mechanical behavior of sintered composite materials.