研究了35CrMoA合金钢在接触应力为150 MPa,等效应力幅值为400 MPa时方形和菱形路径下的微动疲劳特性,包括循环应力响应特征、疲劳寿命、微动斑及微动疲劳断口的形貌特征。结果表明,方形路径下,35 CrMoA钢经缓慢循环软化、快速软化到达最后的稳定阶段,而菱形加载下,材料快速软化之后直接到达稳定阶段；两种路径下的疲劳寿命差别不大；方形加载的滑移区较宽,粘着区较窄,而菱形加载则相反；方形路径下裂纹垂直于试样表面扩展,而菱形加载路径下的微裂纹是曲折的,沿与轴线成一定角度的方向上扩展。
In this paper,the fretting fatigue behavior of 35CrMoA was studied at 150 MPa contact stress and 400 MPa equivalent stress amplitude under square and diamond paths.This included cycle stress response char-acters,fatigue life,morphological characteristics of fretting spot and the failure fracture.The result shows:un-der square path,35CrMoA reached the stage of stability through slow and rapid softening,while under diamond path,it reached the final stage only through rapid softening;The fatigue life have little difference under those two paths;Under square path,the slip region is wide,and the stick region is relatively narrow,but opposite under diamond path;The crack extension perpendicular to the sample surface under square path,but for dia-mond path,the micro crack is tortuous,and extension to a certain angle with axis.
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