关键词: 微动疲劳, 应力强度因子, 有限元, 循环应力, 接触压力, 摩擦因数

Abstract: A global finite element model and sub-model of fretting fatigue of alumium alloy column and plan contact is performed using the commercial code ABAQUS. The effectiveness of the model is validated through a comparison of analytical solution and numerical solution. In the reconstruction of the sub-model with the fracture mechanics code FRANC2D/L, the fretting pad portion is substituted by its equivalent stresses in contact region, which include the normal stress and shear stress. Stress intensity factors (SIFs) are obtained for different influence factors. The results show that cyclic bulk stress has a dominant effect on SIF, which increases as the cyclic bulk stress amplitude increases. Within the depth affected by fretting fatigue, SIF increases as the values of the parameters (the contact load P , the friction coefficient f and the ratio Q/(fP) , where Q is tangential stress) increase. Of these parameters, the ratio Q/(fP) has the most significant effect on SIF, followed by the contact load P , while the coefficient of friction f has the least effect on SIF. Beyond this depth affected by fretting fatigue, these parameters have relatively little effect on SIF.

Key words: fretting fatigue, stress intensity factor, finite element, cyclic bulk stress, contact load, friction coefficient