圆柱/平面径向微动磨损特性及其对疲劳寿命的影响

从微动磨损特性出发,建立圆柱/平面微动磨损分析模型,通过ANSYS计算接触面的接触应力状态和接触面的相对滑移量,得到接触面的接触半径和微动磨损状况.将微动磨损条件下的疲劳寿命划分为微动磨损阶段、疲劳裂纹萌生和裂纹扩展3个阶段,给出接触疲劳应力下3个阶段的疲劳寿命计算方法,结合圆柱/平面径向微动磨损实例进行疲劳寿命估算.结果表明,接触面的应力集中导致裂纹萌生点,将单次施载的磨损量工况下疲劳寿命进行比较,得出微动磨损使构件的疲劳寿命降低,无微动磨损下疲劳寿命约为107.

Radial fretting wear characteristics of cylindrical/planar surface and its influence on fatigue life

Commencing from the fretting wear characteristics,an analysis model of cylindrical/planar fretting wear was established.The surface contact radius and fretting wear conditions were obtained by calculating the contact stress state and relative slippage of contact surfaces with ANSYS.The fatigue life under fretting wear conditions was divided into three stages,namely the stage of fretting wear,fatigue crack initiation,and crack propagation.The fatigue life calculation method was given for these three stages under the action of contact fatigue stress,Taking an actual cylindrical/planar radial fretting wear as the example the fatigue life was evaluated.The result showed that the stress concentration on the contact surface resulted in the initiation of the cracks.Comparing the fatigue life under the condition of single loading,it was found that the fretting wear made component fatigue life reduced,The fatigue life was about 107 for the case of fretting-free wear.