金属基复合材料损伤细观力学分析

DAMAGE MICROMECHANICAL ANALYSIS OF METAL MATRIX COMPOSITES

通过假定增强颗粒的强度符合Ｗｅｉｂｕｌ分布，利用细观力学的方法分析了金属基复合材料增强颗粒断裂随外载的演化关系，及颗粒的大小、分散程度对其宏观性能的影响。结果表明，增强颗粒的平均尺寸对复合材料的宏观性能有较大的影响。对一种ＳｉＣＰ铝基复合材料，上述理论分析与文献中的实验结果吻合较好。

Based on the secant modulus method and Weibull statistic law, a micromechanical method is advanced to model the matrix plastic deformation and the particulate cracking for metal matrix composites during straining. The influences of the particulate mean size and its scatter on the composite macroscopic behavior are analyzed in details.It is found that the particulate mean size plays a key role in the composite damage properties.The theoretical results for a SiC P/Al composite agree well with the experimental ones in the literature.