T型过渡圆弧长度对铁路车轴疲劳性能的影响研究

Impact of the Length of T Shaped Transition on Fatigue Behavior of Railway Axles

研究了非动力车轴T型过渡圆弧长度C对车轴轮座微动参量,微动疲劳SWT参数和过渡圆弧最大主应力的影响,并根据EN 13103-2017校核了车轴过渡圆弧设计的合理性。研究发现:车轴轮座接触压应力、摩擦剪切应力随着C的增加而减小,轴向滑移幅值随着C的增加而增加。微动疲劳SWT参数随着C增加而增加,减小C可以缓解车轴微动疲劳损伤。针对该研究车轴,当C由35 mm增至42 mm时,T型过渡圆弧处最大主应力先减小,此后几乎不变,最大值位置由两段圆弧内切点向轴身侧转移。仿真计算得到的C;略小于标准建议值,车轴设计满足EN 13103-2017对车轴过渡圆弧设计的要求。

The influence of the T-shaped transition length C of the non-powered axle on the fretting parameters,SWT parameter and the maximum principal stress were investigated.Then,the transition design was checked according to EN 13103-2017.It was found that the contact pressure and frictional shear stress decreased with an increase of C,and the axial slip range increased with an increase of C.SWT parameter increased with an increase of C,and reducing C can alleviate fretting fatigue damage of the axle.When C increased from 35 mm to 42 mm,the maximum principal stress at the T-shaped transition first decreased,and then almost remained unchanged.The position of the maximum value shifted from the inner tangent point of the two radii to the side of the axle body.The C;calculated using FE simulation was slightly smaller than that obtained by EN13103-2017,and the axle design met the requirements of EN 13103-2017 for the transition design.