.sic_p / Al Dynamic Mechanical Properties Of The Numerical Simulation And Test Research

The particles reinforced metal-matrix composites (PMMCs) have been focused by many researchers for their excellent mechanical properties and widely applications. The mechanical responses of the PMMCs SiC_p/AI under the effect of different factors have been studied in this article using the finite element method and experimental test.A three-dimensional cubic unit cell was employed according to the real micro-structure of the particles reinforced metal-matrix composites. There are different numbers of spherical SiC particles embedded in the unit cell. The positions of the particles in the unit cell were determined by random function. The stress-strain behavior of the matrix material was assumed to be elastic-plastic one power-law stain rate hardening. The particles were assumed to be ideal elastic. The simulation results showed that the mechanical response of the PMMCs was affected evidently by the strain rate, particle size and particle volume fraction. The smaller the diameter of the particle is. the better the reinforced effect is when the volume fraction of the particles is constant. The flow stress increases with increasing of the particle volume fraction and strain rates.The dynamic properties of SiC_p/AI were tested using the split Hopkinson compressive bars system. Metallographic specimens were prepared by sectioning the deformed composite bar along the bar axis and transverse to the bar axis (axis and transverse sections). The damage evolving information of the particles was observed by microscope. We found that the damage of the particles was affected by the particle volume fraction and strain rate. With the strain increasing. the damage evolution of the particles became se\ere. Finally an analytical model based of the model developed by Li and Ramesh was used to estimate the mechanical behaviors of the SiC_p/AI with different particle volume fraction at the high strain rate. The model was able to provide a reasonable estimate of the flow stress of the composite material.