利用ABAQUS 软件对316L不锈钢构件的弯曲微动过程进行了有限元模拟, 采用SWT多轴疲劳准则预测了弯曲微动裂纹萌生的位置和构件的疲劳寿命。结果表明: 三维模型模拟显示上表面接触中心沿平板宽度方向的接触压应力分布呈边缘大、中间小的趋势, 但最大值并未出现在最边缘, 而是在非常靠近边缘的地方; 随着弯曲载荷的增大, 边缘最大接触压应力随之增大, 中间压应力则随之降低直至为零, 即随着弯曲载荷的增大, 翘曲现象更加严重; 疲劳裂纹最易萌生于距接触表面约93 μm的次表层, 构件疲劳寿命的预测值与试验结果吻合较好。

The bending fretting process of 316L stainless steel component was simulated by ABAQUS finite element software. The Smith-Watson-Topper (SWT) multiaxial fatigue criterion was applied to predicting bending fretting crack initiation locations and component lifetimes. The 3D simulation results show that the contact pressure stress distribution along the flat width direction on the upper surface of the contact center presented the tendency that the edge value was larger and the central value was small, and the maximum was given near the edge but not at the edge. With the increase of bending load the maximum marginal contact pressure stress increased, while the central pressure stress reduced to zero. That means when the bending load increased, the warping phenomenon would be more severe. The fretting fatigue crack initiated from the subsurface, about 93 μm under the contact surface. The fatigue life prediction results of the SWT parameters were in agreement with experimental results.