Numerical Simulation For Cycle Deformation Of Particle Reinforced Metal Matrix Composites Considering The Interface And Thermal Residual Stress

Particle-reinforced metal matrix composites (PRMMCs) are being widely used in machinery manufacturing, aerospace and other fields, the deformation behavior of PRMMCs under cyclic loading had also be concerned by a lot of researchers. During the manufacturing process of the composites, a weak interface layer will form and thermal residual stress will arise duo to the property mismatch between the matrix and the particle. The interface layer and thermal residual stress have a significant effect on the mechanical properties of the composite material. In this paper, based on an advanced constitutive model, the uniaxial tensile and cyclic deformation behaviors of SiCP/6061Al particulate composites are simulated by the finite element software ABAQUS and cohesive element. In the finite element simulation, weak interface and thermal residual stress are considered. The following issues have been addressed in this thesis:1. The cohesive model which can better simulate the behavior of the interface is used to study the effect of the interface on the mechanical properties of composite material. During the simulation, the interface element used the cohesive element of ABAQUS. The uniaxial tensile behavior and the cyclic deformation behavior of the composite material are simulated respectively, and different RVE are used in the simulation. It is shown that the weak interfaces can significantly reduce the tensile properties anti-cyclic deformation ability of the composite material, and the interface is weaker, the greater the amplitude reduced.2. The thermal residual stress was calculated when the composites temperature changed from500℃to20℃. It is shown that, the thermal residual stress in the matrix can reach a high level when the interface is prefect. And plastic strain is produced near the interface of the matrix. But the thermal residual stress reduced when the effect of the weak interface was considered. Considering the thermal residual stress, the uniaxial tensile behavior and the cyclic deformation behavior of the composite material with perfect interface and weak interface are simulated respectively. It is found that, the thermal residual stress reduces the tensile property and anti-cyclic deformation ability, but the weak interface will reduce this effect of the thermal residual.After the above studies, it can be concluded that the tensile property and anti-cyclic deformation capacity of SiCP/6061A1Particle Composite has declined with the weak interface and thermal residual stress considered, and the simulated result was closer to the experiment ones.