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采用试验研究与数值模拟相结合的方法,对SiC_P/Al复合材料的变形损伤进行研究,基于ABAQUS软件的二次开发功能对材料变形过程中的应力状态参数(应力三轴度、柔度系数和Lode参数)进行可视化输出,分析其微观损伤特征。通过试验发现复合材料中轴比较大的颗粒更易断裂,而轴比较小的颗粒倾向于发生界面脱粘,这些是形成裂纹的起源。模拟后发现在颗粒尖角区域及颗粒的聚集处,应力应变通常达到最大值,出现明显应力集中,而且在这些区域的应力状态参数往往也达到峰值,易于微裂纹萌生和扩展。
The deformation damage of SiC_P / Al composites was studied by the combination of experimental research and numerical simulation. Based on the secondary development function of ABAQUS software, the stress state parameters (stress triaxiality, flexibility coefficient and Lode parameters) for visual output, analysis of its microscopic damage characteristics. It has been found through experimentation that the relatively large particles in the composite tend to break more easily, while the particles with smaller axes tend to de-bond at the interface, which are the origins of crack formation. After simulation, it is found that the stress-strain reaches the maximum at the sharp corner of the particle and the agglomeration of the particles, with obvious stress concentration, and the stress state parameters in these areas often reach the peak value, which is easy to initiate and expand the micro-cracks.