Crack Initiation and Propagation Mechanism of SiC/AZ91D Composites During Uniaxial Tensile Process Based on Three-dimensional Microstructure

doi:10.3901/JME.2024.16.160

Abstract

Abstract: To avoid the drawbacks of pre cracking in specimens and singularity at the crack tip when simulating crack problems based on linear elasticity, it is proposed introducing cohesive elements at the particle interface to simulate and study the crack initiation and propagation mechanism of SiC/AZ91D magnesium based composites under uniaxial tension, providing a new approach to solving crack propagation problems. The results show that the introduction of SiC particles can effectively block the initiation and propagation of cracks. An increase in particle volume fraction or particle size will accelerate the crack propagation process of composite materials, reduce their elongation, and are in good agreement with experimental results; The mechanism of crack initiation and propagation during the tensile process of SiC/AZ91D magnesium based composite material is the initiation of cracks at the interface between particles and matrix, where microcracks connect to form cracks and propagate around the particles, resulting in material fracture.

Key words: SiC/AZ91D magnesium matrix composites, finite element analysis, cohesion model, uniaxial stretching, crack propagation

CLC Number:

TB331

LI Yiran, YAO Junping, LIANG Chaoqun, XIAO Peng, CHEN Guoxin, LI Buwei. Crack Initiation and Propagation Mechanism of SiC/AZ91D Composites During Uniaxial Tensile Process Based on Three-dimensional Microstructure[J]. Journal of Mechanical Engineering, 2024, 60(16): 160-170.

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