参数对2A12铝合金微动疲劳局部塑性影响分析

目的研究局部塑性对微动疲劳的影响。方法建立2A12铝合金圆柱/平面微动疲劳有限元模型,考虑塑性作用进行有限元分析,研究微动疲劳参数对局部塑性的影响。结果局部塑性变形发生在试件表面或次表面,最大等效塑性变形随着微动垫半径的减小而增大。随着轴向应力的增加,最大切向应力增加;随着摩擦系数的增加,剪应力的最大值急剧增加,粘着区增加,滑移区减小,但摩擦系数对整个接触区的大小没有影响。结论微动疲劳参数对局部塑性有一定的影响。

Analysis of Impact of Parameters on the Localized Plasticity of 2A12 Aluminum Alloy Fretting Fatigue

Objective To study the effects of localized plasticity on fretting fatigue. Methods The 2A12 aluminum alloy cylindrical/plane fretting fatigue FEA model was established, FEA analysis was performed considering the plasticity, and the effect of fretting fatigue parameters on localized plasticity were studied. Results The results indicated that the localized plasticity occurred on the surface or sub-surface of the sample, and the maximum equivalent plastic deformation increased with decreasing fretting pad radius. With increasing axial stress, the maximum tangential stress increased. With increasing COF, the maximum value of shear stress increased sharply, the stick zone increased and the slip zone decreased, however,COF had no effect on the size of the whole region. Conclusion The parameters of fretting fatigue had certain effects on localized plasticity.