材料工程2025，Vol.53Issue(9)：101-114,14.DOI:10.11868/j.issn.1001-4381.2023.000027
基于三维微观结构的SiCp/AZ91D复合材料裂纹萌生扩展机制
Crack initiation and expansion mechanism of SiCp/AZ91D composites based on three-dimensional microstructure
摘要
Abstract
The cohesive force unit is added to the three-dimensional model of SiC particle-reinforced magnesium matrix composites(SiCp/AZ91D)using the finite element analysis program Abaqus,and the mechanism of crack sprouting extension of SiCp/AZ91D with different particle equivalent sizes and volume fractions under uniaxial compression is investigated.The invention of the cohesive force unit offers a new approach to addressing the issue of crack extension by avoiding the shortcomings of specimens with prefabricated cracks and the singularity of the crack tip.The results show that the yield strength and compressive strength of SiCp/AZ91D are significantly higher than that of the matrix,while the plasticity is decreased.The microcracks of SiCp/AZ91D are first initiated at the junction of particle and matrix and then propagate around the boundary or sharp angle of SiC particles along the direction of maximum shear stress,forming the main crack.The increase in particle equivalent size and volume fraction will accelerate the crack germination and propagation process of SiCp/AZ91D.关键词
SiC/AZ91D/三维有限元/内聚力单元/单轴压缩/裂纹扩展Key words
SiCp/AZ91D/three-dimensional finite element/cohesive unit/uniaxial compression/crack extension分类
通用工业技术引用本文复制引用
梁超群,尧军平,李怡然,肖鹏,陈国鑫,李步炜..基于三维微观结构的SiCp/AZ91D复合材料裂纹萌生扩展机制[J].材料工程,2025,53(9):101-114,14.基金项目
国家自然科学基金(52065046,51661024) （52065046,51661024）
江西省科技重点研发计划(20202BBEL53024) （20202BBEL53024）
