Nμmerical Simulation Of Mechanical Properties Of Sicp/Al Composites Prepared By High Pressure Torsion

SiCp/Al composites have been widely used in the fields such as aerospace,vehicleengineering and marine engineering because of its excellent overall performance suchas high specific strength,low thermal expansion coefficient and good thermalconductivity ratio.As a result,scholars at home and abroad have made certainachievements on the basic research of SiCp/Al composites and the results are mainlyfocused on the preparation processes and strengthening mechanisms of SiCp/Alcomposites.However,there are few researches about the nμmerical simulation of themechanical properties of SiCp/Al composites.In this paper,the SiCp/Al composites are prepared using high pressure torsion processand the paper describes the calculation of the quality of the composite powder,highpressure torsion test and tensile tests and so on. The finite element model of SiCp/Alcomposites is established by the software MARC and the paper describes the geometricmodeling,meshing,constitutive relations,setting of contact relationship and boundaryconditions in the procedure of establishing the finite element model of SiCp/Alcomposites.Then the deformational behavior and mechanical properties of SiCp/Alcomposites are nμmerically simulated. The paper studies the influence of SiC particleson the deformation behavior of composite materials,the stress and strain distribution ofcomposite materials and the mechanical properties(stress-strain curve,elasticmodulus,yield strength)of composite materials.The simulation results show that the strain distribution is uneven under differentdeforming condition. With the increasement of the applied strain the plastic deformationarea gradually spreads from the region far away from the interface between SiC particleand alμminμm matrix to the region near the interface. There exists a certain straingradient in the composites and the direction of the equivalent strain of alμminμm matrixis roughly45°to the direction of the applied load. Polygonous SiC particles bear largerload,which can improve the strength of the composite material. The elastic modulus ofcircular SiC particle reinforced alμminμm matrix composites is higher than that ofpolygonous SiC particle reinforced alμminμm matrix composites. The stress-straincurve of the composite material has significantly increased with the increasement of thecontent of SiC particle in the plastic deformation stage in the single-particle model. Thestress-strain curve of the composite material doesn’t show obvious changing trend withthe increasement of the side nμmber of SiC particle and the stress-strain curves of the composite materials have some intersect with each other in the deformation stage in themultiple particle model. The yield strength of the SiCp/Al composite material is highwhen the side nμmber of SiC particle is small and the content of SiC particle is high inthe single particle model.