Constitutive modelling concerning the effects of particulate shapes for the cyclic deformation of SiCP/6061Al composites at high temperature

摘要

Based on the Eshelby equivalent inclusion theory and the extended Mori-Tanaka method, a new meso-mechanical cyclic visco-plastic constitutive model was obtained to describe the cyclic deformation of SiCP/6061Al composites at high temperature. In the proposed model, a thermal recovery term was introduced into the newly developed non-linear kinematic hardening rule to represent the thermal recovery effect of the matrix alloy produced at high temperature. Meanwhile, the Eshelby tensor for ellipsoidal inclusions with different aspect ratios was employed into the new model to reflect the effect of particle shapes on the cyclic deformation of the composites. Finally, the simulated results of the proposed model to the time-dependent monotonic tension and uniaxial cyclic deformation of SiCP/6061Al composites with different particulate shapes at high temperature was verified to be reasonable by comparing with the corresponding experiment ones and finite element simulations.