Numerical Simulations On The Yielding Behavior Of Particle-reinforced Metal Matrix Composite

Compared to traditional metallic materials, there are many excellent mechanicalproperties for particle-reinforced metal matrix composites (PMMC), such as high yieldingstrength, high modulus, high corrosion resistance and so on. As a result, it has been widelyused in the aerospace, construction, transportation, machinery and many other importantindustrial areas. The introduction of second-phase particles can not only improve themechanical properties but also reduce the material fracture properties and fatigue life.Considering for this, it is necessary to study the influence of the PMMC.Yielding surface and its subsequent evolution play an important role on the theory ofplastic constitutive theory, in most plastic constitutive models, the description of thestress-strain relationships are built based on the conception of yield surface, the yieldsurface shape and its evolution has great scientific significance on material constitutivemodel, and also on the constitutive law of PMMC.Basing on this consideration, in the present work, basing on the homogenizationmethod, the random sequential adsorption (RSA) algorithm was employed to generate theparticle distribution in the particle-reinforced metal matrix composite. Basing onsimulation, the volume fraction of particle, cyclic loading, quenching temperature hasbeen discussed carefully. Most of the work focused on the yield behavior of PMMC，include initial yield behavior and subsequent yield behavior. On the π-plane, the materialof matrix and the defining of yielding stress affecting the initial yield behavior has beendiscussed carefully; the yielding stress and the magnitude of pre-strain affecting thesubsequent yield behavior has been discussed carefully. The appropriate value of yieldingstress has been determined by simulating the subsequent yield surface of matrix. Thedifference of subsequent yield behavior between PMMC and matrix has been discussed.The result shows that, the movement and distortion of yield surface might be caused bythe introduction of residual stress by particles.