Numerical analysis on the effects of particle configuration on the damage and mechanical properties of particle reinforced MMCs under dynamic compression

Three finite element (FE) models were constructed based on a typical SEM micrograph of particle reinforced metal matrix composites (PRMMCs) in this paper. These models had similar particle distribution but different particle configuration, and were used to investigate the effects of particle configuration on the damage evolution and mechanical properties of PRMMCs under dynamic compression. The calculating results showed that the damage was pronounced in particle corners and matrix ligaments between closely aligned particles, and it was more severe in the regions of particle clusters. The irregular particles share high loads, and they are prone to be damaged during dynamic deformation of PRMMCs. By smoothing the particle surfaces, the yield strength and initial strain hardening of PRMMCs were reduced, whereas the strain hardening at large strain deformation was enhanced. These effects of particle configuration on the damage and effective properties of PRMMCs were promoted by increasing the strain rates.