Paris公式疲劳常数测定的有限元法

基于材料疲劳常数测定的经济性和对疲劳问题的有限元模拟研究,采用了高精度二次单元来建模,并对裂尖单元进行了奇异退化、对裂尖局部进行了网格细化;基于材料的塑性累积特性,采用随动强化材料模型,以材料抗拉强度作为裂纹开裂准则;通过有限元对实例进行了模拟分析,并与试验值进行了对比,说明了本模拟方法的精度和可靠性,为疲劳问题的有限元模拟提供了一定的借鉴。

The Fatigue Constant of Paris Formula Gained by Finite Element Method

Considering the expenditure of the material fatigue constant achieved through experiment and fatigue problem researched with finite element method ,this paper has adopted high precision quadratic element to build the finite element model, has conducted singular degeneration on the crack tip and mesh detailing on part crack tip. Since the metal has a property of plastic accumulation, adopting following aggrandizement material model, the material tensile strength was defined as crack propagation norm. In this paper, an actual example is analyzed and compared with the experiment,which can verify the accuracy and the reliability of the finite element method. So, it can supply a good reference for the fatigue problem researched with the finite element simulation method.