The Finite Element Numerical Analysis Of Mechanics Properties Of Particle-reinforced Magnesium Composite Material

In recent years, metal matrix composites developed rapidly as a new engineering material,it gets increasing attention because of superior performance. SiC particles reinforcedmagnesium matrix composite material is a high specific strength and high specific stiffnessand other excellent mechanical properties, becoming the most-watched material. It can be usedin aerospace, military, automotive, electronics, sports and other fields. But basic research isstill very weak for SiC particle reinforced magnesium matrix composites, so exploring themechanical behavior has important implications for the application of composite materials.In this paper, the model of SiC particle reinforced magnesium matrix composites materialhas been established by the APDL function in ANSYS finite element analysis software, thenmechanical properties of composite material was numerical simulated by uniaxial tensileload．Analyze the composite particles randomly distributed in the three-dimensional model，different particle number, particle shape, particle volume fraction effect on the mechanicalproperties of magnesium matrix composites. The simulation results show, under the samevolume fraction, as the number of particles is increased, the yield strength of the compositedecreased, but when the number of particles exceeds a certain amount, has little effect on themechanical properties of the composite material. Particle shape is more acute, enhanced effectis more obvious, yield stress value become greater. However, spherical particles can reducestress concentration, thereby reduce the possibility of damage. In the same condition ofreinforced particles size, with the increase of volume fraction of particles, particles are easy togather, this place is easy to damage.The element birth and death module of ANSYS is used to realize the simulation ofparticle reinforced magnesium matrix composites crack propagation, under the action of loadstep, according to the calculation of ANSYS results determine element of birth and death. Intwo-dimensional random particles as the research model, the crack propagation path is shownby means of showing all live elements with no the death elements, at this time the trend ofspreading along the focus on tensile direction of crack, crack is easy to produce betweenparticles and particles. Without considering the interface problem, matrix damage plays adecisive role to the damage of composite materials. Three dimensional random particulate reinforced magnesium matrix composites model isestablished by ANSYS, the elastic modulus of the composite increased with the volumefraction increasing; finite element method was applied to reach elastic modulus of differentreinforcement volume fraction, its value fall in between series modal and parallel modalcalculate the results, with the value was very close to me experimental values, which showsthat the finite element method to predict the elastic modulus is more accurately. With volumefraction increasing, series model predict deviation of the elastic modulus deviation rise.