【摘要】 采用MTS809拉扭复合疲劳试验机、扫描电镜(SEM)研究了接触应力为150MPa时35CrMoA合金钢在菱形加载路径下微动疲劳性能。结果表明:随着等效应力幅值的增加,材料的软化、硬化效果更加明显;剪应力-剪应变滞后回线的面积增大;裂纹萌生源区的面积减小,瞬断区面积与总断面面积的比例增加,瞬断区的撕裂也越严重。微动磨损使表面塑性枯竭,从而形成疲劳裂纹源。更多还原

【Abstract】 The stress controlled fretting fatigue behavior of 35 CrMoA steel under the diamond loading condition was investigated at the contact stress of 150 MPa by MTS809axial/torsional test system and SEM.The results indicate that,with the increase of equivalent stress amplitude,the extent of softening and hardening becomes pronounced;the area of shear stress-strain hysteresis loop increases;the area of crack initiation decreases,the proportion of final fracture in fracture surface region increases,the degree of tearing becomes more serious.The plasticity is exhausted and easy to form crack initiation as a result of fretting wear.更多还原