金属结构的疲劳损伤有限元分析研究

金属材料的疲劳损伤是工程界早已发现的问题，金属结构的疲劳破损问题正日益突出，为了较好地预测金属结构和构件的剩余疲劳强度与疲劳寿命，必须建立疲劳损伤有限元分析模型，来完整描绘其应力场、应变场以及损伤场的变化全过程．针对金属材料的特点，从损伤力学的基本原理出发，通过切实可行的疲劳损伤演化规律实现损伤理论与有限元软件的结合，建立适用于金属结构的疲劳损伤有限元分析模型，最后通过疲劳试验结果与理论计算比较，对模型进行了分析与评价。

Research on the finite element analysis of fatigue damage for metal structures

The fatigue damage of metal materials has been recognized in engineering field for a long time. And the fatigue damage problem of metal structures has become more and more serious. In order to pre-estimate the residual fatigue strength and fatigue lifespan of metal structures or elements better, the finite element analysis model of fatigue damage must be established to describe the whole varying process of stress field, strain field and damage field. From the feature of metal materials, this paper realizes the integration of damage theory with finite element analysis software by a simple, feasible fatigue damage evolutionary rule on the basis of fundamental principles of damage mechanics. Finally, by comparing the calculation results with the experimental ones, the applicability and practicability of the model is appraised.