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基于复合材料扫描电镜图像,通过图像处理和识别技术,建立复合材料真实微观结构有限元模型,利用该微观模型对SiCp/2024Al复合材料在准静态与动态下的力学性能进行研究。结果表明,SiCp/2024Al复合材料在准静态与动态下的力学性能有显著差异,随着应变率增大,复合材料的弹性模量、屈服强度、流动应力均增大,在高应变率下复合材料出现应变软化现象;在动态压缩过程中,高体积分数SiCp/2024Al复合材料其承载机理与低体积分数复合材料不同;SiCp/2024Al复合材料在加载过程中同时受到应变硬化、应变率硬化作用,并随着增强体SiC颗粒体积分数增大,应变率敏感率随之增加。
Based on the SEM images of composite materials, a real microstructure finite element model of composite material was established by image processing and recognition technology. The mechanical properties of SiCp / 2024Al composite under quasi-static and dynamic conditions were studied by using the microscopic model. The results show that the mechanical properties of SiCp / 2024Al composites are significantly different under quasi-static and dynamic conditions. As the strain rate increases, the elastic modulus, yield strength and flow stress of the composites increase, In the process of dynamic compression, the loading mechanism of SiCp / 2024Al composites with high volume fraction is different from that of low volume fraction composites. SiCp / 2024Al composites are subject to strain hardening and strain rate hardening during loading, And as the volume fraction of SiC particles increases, the sensitivity of strain rate increases.