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采用有限元法建立了M50钢滑滚摩擦副的弹塑性接触模型,在接触应力约为4.0GPa、线速度约为50m·s-1的高速重载工况下,分析了其等效应力、剪切应力场与表层塑性变形,研究了摩擦因数与相对滑动速度对M50钢滑滚摩擦副接触行为的影响,并对比了M50钢双滚子滑滚试验中的表层塑性变形。计算结果表明:M50钢摩擦副的最大接触应力和椭圆接触区长、短轴长度的有限元分析结果与Hertz理论计算结果的偏差分别为2.66%、0.26%、6.43%;当摩擦因数由0.1增加到0.5时,最大等效应力的位置由摩擦副次表层约0.5mm处逐渐向接触表面发展;摩擦副表面发生胶合失效时的摩擦因数大于0.3,接触表面最大等效应力大于1 700 MPa;胶合失效发生时,M50钢摩擦副的应力和塑性应变具有特定的方向性,表现在滑滚比分别为0.12、0.15条件下,接触点处线速度较高的表面最大等效应力分别达到2 847、2 689 MPa,产生较大的塑性应变,最大值分别达到0.062、0.061,而线速度较低的表面最大等效应力分别为2 269、2 101 MPa,产生的最大塑性变形相对较小,分别为0.040、0.039。
The elastic-plastic contact model of M50 steel sliding friction pair was established by using finite element method. Under high-speed and heavy-load conditions with contact stress of about 4.0GPa and linear velocity of about 50m · s-1, the equivalent stress, Shear stress field and plastic deformation of the surface, the influence of friction factor and relative sliding velocity on the contact behavior of the friction pair of M50 steel was studied, and the plastic deformation of the surface of the M50 steel in the double-roller sliding test was contrasted. The calculated results show that the maximum contact stress and the contact length of elliptical contact area between M50 steel friction pair and the Hertz theoretical calculation result are 2.66%, 0.26% and 6.43% respectively. When the friction coefficient increases from 0.1 At 0.5, the maximum equivalent stress position gradually developed from the sub-surface layer of friction pair to the contact surface. The friction factor of the friction pair surface was greater than 0.3 and the maximum equivalent stress of the contact surface was more than 1700 MPa. When failure occurs, the stress and plastic strain of the M50 steel friction pair have a certain directionality, and the maximum equivalent stress of the surface with higher linear velocity at the contact point reaches 2 847 when the roll-roll ratio is respectively 0.12 and 0.15. 2 689 MPa, the maximum plastic strain is larger than 0.062,0.061, while the maximum equivalent surface stress of the low linear velocity is 2 269,2 101 MPa, respectively. The maximum plastic deformation is relatively small 0.040, 0.039.