Effects of porosity on uniaxial compression crack initiation and propagation of SiCp/AZ91D composites
Using the cohesive force model and finite element analysis method,pore defects were introduced into the finite element model of AZ91D magnesium matrix composites reinforced with actual morphology SiCp particles.The effect of different porosity on crack initiation and propagation of the SiCp/AZ91D composites under uniaxial compression was analyzed.The results show that the cracks in the SiCp/AZ91D composites without pores initiate at the junction between the sharp corners of the particles and the matrix,while the cracks in composites with pores initiate at both the matrix pores and the junction between the sharp corners of the particles and the matrix.The higher the porosity of the composites,the lower its compressive strength and yield strength,and the longer the fracture crack length.The increase in porosity leads to an earlier time for crack initiation and fracture in the composites,and accelerates the initiation and propagation of the cracks in the composites until fracture.
cohesive modelfinite element analysisporositycrack propagationcomposites fracture
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