基于试验验证的磨耗型钢轨波磨形成机理

Formation Mechanism of Worn Profile Rail Corrugation Based on ExperimentalVerification

摘要:

对磨耗型钢轨微观接触斑范围内的波磨产生机理进行了研究，提出了钢轨波浪型磨耗的微观波长锁定扩展机制，分析了波磨在此机制的作用下的形成机理.设计研制了小比例的双模拟轮滚动试验台对此波磨形成机制理论进行试验验证并进行了相应的线路试验，试验台可测出不同载荷作用情况下的横向蠕滑力，试验验证了不同正压力下的蠕滑力蠕滑率变化规律，结合线路试验的波磨区段黏滑振动特征，验证了理论分析的波磨微观形成机理，所验证的形成机理理论可用于解释实际工程中的多种波磨现象.

Abstract:

This paper presents a study on microscopic mechanism of the weartype rail corrugation and proposes a wavelength locking mechanism of worn profile rail corrugation. The microscopic formation mechanism of rail corrugation was analyzed under this wavelength locking mechanism. A smallscaled roller rig with two simulation wheels has been designed to verify this formation mechanism of the rail corrugation by experimental and the corresponding line tests were also carried out. The lateral creep forces at variable loadings can be measured in this test rig. The creep forces vs. creepage rate curves have been obtained under variable loadings. The results have compared against with the micro mechanism of rail corrugation proposed. It is proved that the theoretical analysis of the microscopic mechanism of wear type rail corrugation. Therefore, this validated theory can be used to explain phenomenon of many types of rail corrugations.