Comparison of Meso Finite Element Modeling Methods for Particle Reinforced Metal Matrix Composites

Taking TiB₂ particle reinforced iron matrix composites prepared by in-situ formation method as research object, the parameters of power hardening model of matrix were determined by nano indentation test and finite element inverse analysis. The two-dimensional meso real structure model and body cell model with particle random distribution were established, and then the uniaxial tensile test was simulated. The true stress-true strain curve was calculated by equivalent macro method, and the simulation of the two models were compared. The effect of boundary condition on the simulation was discussed. The results show that boundary conditions had little effect on the simulated true stress-true strain curve during uniaxial tension. The true stress-true strain curves by simulating uniaxial tension with the two models had little difference, which were consistent with test results, and the relative error was less than 5%. The error of elastic modulus and yield strength by simulation with real structure model was smaller than that with body cell model. The local microscopic equivalent stress field and strain field of matrix and particle by simulation with different models were obviously different.