金属基复合材料热机械疲劳加载模型的数值解法和应用

论述考虑涂层效应的纤维增强金属基复合材料的热机械加载模型的数值解法和工程应用实例.热机械加载三层细观力学模型归纳为一阶常微分方程组的初值问题,在考虑数值求解的方法时采用经典的4阶Runge-Kutta法.对细观模型层间应力分配系数的确定,进行详细讨论.选择常用的铝基复合材料,计算其在温度循环和机械应变循环同相位和反相位两种情况下材料总体和各组分的力学响应.计算得到材料涂层处的应力状态以其对复合材料整体热机械加载性能的影响.

NUMERICAL SOLUTION OF MECHANICAL MODEL OF FIBER REINFOCED MMCs UNDER CYCLIC THERMOMECHANICAL LOADING

The numerical methods and applications of a micromechanical model with coating effects for fiber-reinforced metal matrix composites are concerned. The three-layer model of thermomechanical loading is reduced to a set of the ordinary differential equations of one order. Numerical solution algorithms are developed based on the classical fourth order Runge-Kutta method. The determination of the stress partitioning factor between the layers is investigated in detail. Use of the model is illustrated by means of an example involving Al metal matrix composites(MMCs) during the procedure of cyclic thermomechanical loadings. Mechanical response of the total and parts of the material is calculated under the superposition of temperature cycle and mechanical strain cycle in in-phase or out-of-phase. The stress in the coating is obtained as well as it's influence on the thermomechanical behavior of the material.