孔隙率对SiCp/AZ91D复合材料单轴压缩裂纹萌生及扩展的影响
Effects of porosity on uniaxial compression crack initiation and propagation of SiCp/AZ91D composites
陈国鑫 1尧军平 1李步炜 1梁超群 1李怡然1
作者信息
- 1. 南昌航空大学航空制造工程学院,江西南昌 330063
- 折叠
摘要
使用内聚力模型及有限元分析方法,在含实际形貌SiCp颗粒增强AZ91D镁基复合材料有限元模型中引入孔隙缺陷.分析不同孔隙率对SiCp/AZ91D复合材料在单轴压缩情况下的裂纹萌生及扩展的影响.结果表明:无孔隙的SiCp/AZ91D复合材料裂纹萌生在颗粒尖角与基体交界处,含孔隙的复合材料在基体孔隙以及颗粒尖角与基体交界处均会萌生裂纹,复合材料的孔隙率越高,其抗压强度和屈服强度越低,断裂裂纹长度越长,孔隙率的增加使得复合材料的裂纹萌生和断裂的时间提前,加速了复合材料裂纹萌生扩展直至断裂.
Abstract
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.
关键词
内聚力模型/有限元分析/孔隙率/裂纹扩展/复合材料断裂Key words
cohesive model/finite element analysis/porosity/crack propagation/composites fracture引用本文复制引用
基金项目
国家自然科学基金(52065046)
国家自然科学基金(51661024)
江西省科技重点研发计划(20202BBEL53024)
出版年
2024
NETL
NSTL
万方数据