Al／Al_2Cu自生复合材料弹塑性变形的晶体细观力学模拟

SIMULATION OF ELASTO-PLASTIC DEFORMATION OF In-Situ Al-Al_2Cu COMPOSITE BY CRYSTALLINE MACRO-MICRO MECHANICAL APPROACH

从晶体细观力学出发建立了金属基复合材料的本构模型，以Ａｌ－Ａｌ２Ｃｕ自生复合材料为模型材料，并依据各组元材料的单晶体变形－受载曲线，用数值法模拟计算了其拉伸变形过程，得到了与实验结果相符的应力－应变曲线，研究了变形过程中基体和增强相之间的应力分布规律、基体的滑移变形规律、以及相间间距和界面影响区的作用．结果表明，晶体细观力学方法用于金属基复合材料的分析和设计，能全面系统定量地细致反映组元材料性质和分布等因素对复合材料宏观力学性能及局部变形不均匀特性的影响．

A crystalline macro-micro mechanical approach is developed to analyze the mechanical behaviour of metal matrix composite numerically,on the basis of the data of single crystal deformation. The tensile deformation is simulated in particular using a model system Al-Al2Cu in-situ composite. The calculated stress-strain curves agree well with the experiment result by Davidson et al. The initiation and growth of matrix slip deformation and the inhomogeneous distribution and variation of the stress in the specimen especially near the interface are obtained.The effect of matrix/ reinforcement interface and interlamellar spacing λ on the stress-strain behaviour of metal matrix composite are investigated. It is shown that the crystal macro-micro mechanical approach, which can provide some useful information to insight into the deformation mechanism, is very helpful to analyze and design the mechanical properties of metal matrix composite