纤维增强铝基复合材料热残余应力细观力学模型

Micromechanics model of the thermo-residual stress for fiber reinfoced aluminum matrix composites

从复合材料内部组分的细观力学关系入手 ,建立了基底 /涂层 /纤维三层力学模型。该核型能够分析有涂层的连续纤维增强金属基复合材料在温度和机械载荷同时变化下的应力应变关系 ,并可用于计算铝基复合材料的制造热残余应力状态。算例分析表明 :涂层的物理性能对复合材料的整体力学性能有很大影响。在涂层上 ,有些残余应力分量远高于基底和纤维处的状况。涂层的弹性模量不同 。

In view of the different parts of composition, a three-layer micromechanical model of matrix/coat/fiber is established. It can be used to analyze the stress-strain relationship of fiber-reinforced metal matrix composites with coating material under a super-position of thermal and mechanical loads. In this paper the model is applied to calculate the thermo-residual stress in production of a fiber-reinforced aluminum matrix composite. The physic behavior of the coating material plays an important role in the total mechanical characteristics. Some components of the residual stress in the coat is much greater than that in the matrix and fiber. The transversal stress is obviously influenced by varying the axial modulus of elasticity of the coating material.