Micromechanical modeling of cyclic elasto-viscoplastic behavior of unidirectional metal matrix composites under elevated temperature

Abstract

In this paper, a new format is proposed for rate-dependent cyclic behavior of unidirectional metal matrix composites, which combines the cyclic elasto-viscoplastic constitutive model with the parametric finite-volume direct averaging micromechanics theory (FVDAM). The cyclic constitutive model provides the capability of simulating materials rate-dependency for the FVDAM theory, and the FVDAM theory’s ability of calculating responses of composites makes it a suitable solution for the title problem. To verify the effectiveness of the proposed model, both experimental data and numerical simulations are adopted for comparison. The experimental data of unidirectional SCS-6/Timetal21S was compared with the simulation results of FVDAM, with a good agreement. A finite-element method (FEM) based unit cell model is constructed using ABAQUS; and both homogenized responses and local fields are compared. The excellent correlations prove the effectiveness of the proposed model. The effect of fiber orientations is also revealed. The generated results indicate that the FVDAM is well-suited for simulating the cyclic elasto-viscoplastic behavior of unidirectional metal matrix composites under elevated temperature.