重载铁路钢轨磨耗状态下的轮轨法向接触特性

Wheel Rail Normal Contact Characteristics of Heavy Haul Worn Rails

摘要:

基于三维弹性体滚动接触理论，对法向接触问题最小余能方程的影响系数和法向间隙进行修正，使其更适用于非平面接触问题的求解.以某重载铁路通过总重达100 Mt的CHN75型面磨耗钢轨为对象，车轮选取LMA系列原始型面，利用修正后的接触模型，研究在30 t轴重作用下的轮轨法向接触特性.结果表明：轮对横移量对轮轨接触特性影响较大，横移量在+12～+14 mm轮轨接触状态变化显著；其中，横移量在+12.9～+13.2 mm时出现两点接触，横移量增大至+14 mm时出现车轮轮缘和钢轨轨距角的接触.

关键词:轮轨接触; 接触应力; 磨耗

Abstract:

Based on Kalker’s three-dimensional elastic rolling contact theory, the influence coefficient and the normal distance in the minimum complementary energy function were modified, making it proper for solving non-planar contact problems. Using the modified contact model, the wheelrail normal contact characteristics at 30 t axle load was studied with a 100 million gross traffic tonnage of CHN75 profile worn rail and an LMA original profile wheel. The results show that the wheel-set lateral displacement has a significant impact on the contact characteristics. Remarkable changes of contact state can be seen at +12mm to +14mm. Twopoint contact occurs at +12.9mm to +13.2mm, and the contact between wheel flange and rail gauge corner occurs at +14mm.

Key words:wheelrail contact; contact stress; wear