Yielding behavior of particle reinforced metal matrix composite

Based on the large strain axisymmetric elasto-plastic finite element and the law of mixture, the analytical expressions between the elastic modulus, the yielding stress and the tangent modulus of composite and the stress strain partition parameter were derived. A new method for defining the yield behavior of particle reinforced metal matrix composite (PRMMC) was proposed. The effects of the particles shape (sphere, unit cylinder, ellipse) and the material structure parameters (particle volume fraction, particle end spacing) on the deformation behavior of PRMMC were investigated. It was demonstrated that the method to describe the yielding behavior of composite by examining the variation of the second derivative of the stress-strain partition parameter can be used for both PRMMC and short fiber reinforced metal matrix composite. The effects of particles shape and the material structure parameters on initial yielding behavior are shown more appropriately by this new method. The predicted proportion limit is in good agreement with the experiment.