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以承受旋转弯曲载荷下的空心轴和轴套过盈装配体为研究对象,应用有限元法建立了接触模型,分别计算了不同过盈量、不同载荷、不同空心度和不同摩擦系数下,接触面上某一接触线的接触状态(黏着区、滑移区、张开区)和应力分布情况.引入修正系数对接触状态的判定公式进行了修正,并研究了各参数对修正系数的影响.结果发现:黏/滑交界点和滑/开交界点附近易产生微动裂纹;随着弯曲载荷的增大,接触面上的滑移区间大小不变,但其分布位置逐渐向接触中心移动;过盈量越大,接触面间发生磨损区间越小;轴的空心度不影响黏着区的大小,但控制着滑/开交界点位置;摩擦系数对法向接触应力值的影响较小,但切向应力值却随其增大而增大.
In order to bear the hollow shaft and sleeve interference assembly under the rotating bending load, the contact model was established by finite element method. The contact models were calculated with different interferences, different loads, different hollownesses and different friction coefficients The contact states (adhesion zone, slip zone, open zone) and the stress distribution of a certain contact line on the surface are corrected by introducing the correction factor, and the influence of each parameter on the correction factor is studied. The results show that fretting cracks tend to occur in the vicinity of the viscous / slip boundary and the slip / inflection point. With the increase of the bending load, the size of the slip region on the contact surface remains the same, but its distribution gradually moves toward the contact center. The larger the interference is, the smaller the abrasion interval between the contact surfaces is. The hollowness of the shaft does not affect the size of the adhesion zone, but it controls the position of the slip / contact point. The friction coefficient has little influence on the normal contact stress value Tangential stress increases with the increase.