(1. 南昌航空大学 轻合金加工科学与技术国防重点学科实验室，南昌330063；
2. Center of Advanced Materials Processing and Manufacturing, The University of Queensland, St Lucia, QLD 4072, Australia)
摘 要: 针对真空压力浸渗制备的单向碳纤维增强铝合金复合材料(CF/Al复合材料)，采用细观力学数值模拟与实验结合的方法研究了其横向拉伸损伤演化和断裂力学行为，并分析了界面对复合材料横向拉伸力学性能的影响。结果表明，基于基体合金延性损伤和界面内聚力损伤本构所建立的细观单胞有限元模型，可以实现CF/Al复合材料横向拉伸弹塑性力学响应的计算和预测。复合材料横向拉伸时先后发生界面损伤、界面失效以及基体损伤累积与失效现象，界面损伤脱粘并诱发基体塑性损伤和失效是导致复合材料横向断裂的主要机理。增加界面强度有利于提高横向拉伸屈服强度和极限强度，界面刚度对极限强度影响不大，但增加界面刚度可有效提高复合材料横向拉伸弹性模量。
关键字: 铝基复合材料；细观力学；单胞；渐进损伤；界面；数值模拟
（1. National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China;
2. Center of Advanced Materials Processing and Manufacturing, The University of Queensland, St Lucia, QLD 4072, Australia）
Abstract:The unidirectional graphite fiber M40J reinforced aluminum alloy composites (CF/Al composites) was fabricated by vacuum assisted pressure infiltration technology. The elastic-plastic mechanical behavior and the damage evolution behavior of composites was evaluated using micromechanics FEM and tensile testing method. According to the numerical simulation and experimental results, the influence of interface property on the mechanical properties of the campsites during transverse tensile process was also analyzed. The results show that the micromechanical representative volume element (RVE) model established can evaluate the stress-strain behavior of the composites in transverse tensile process. The occurrences of initial damage, damage accumulation and failure in the interface and matrix alloy lead to the fracture of the composites. There is an important influence of interface property on the ductile damage evolution and failure of matrix alloy, which eventually determined the transverse fracture mechanical properties of the CF/Al composites.
Key words: aluminum matrix composite; micromechanics; unit cell; progressive damage; interface; numerical simulation
