Experimental Study on the Formation and Evolution of Wheel Polygon under Different Contact Parameters

doi:10.3901/JME.2023.15.185

Abstract

Abstract: The wheel polygon formation rule under different wheel/rail contact parameters (normal force, slip ratio, rotational speed) is studied using the WR-1 wheel/rail rolling wear machine. The wheel/rail vibration characteristics during the rolling process is analyzed, and the hardening and damage rule of polygon wheel samples are explored. The results show that when the normal force, slip ratio and rotational speed are small, the wheel-rail vibration is stable and the no obvious polygon is produced on the wheel sample. With the increase in normal force, slip ratio and rotational speed, the obvious main vibration frequency is generated, and the vibration amplitude increase with the time. The polygon is generate gradually on the wheel samples. The polygonal wave depth increase with increasing the normal force and slip ratio. After the test, the hardness of the wheel sample decreased gradually with the depth, and the hardness of the wheel sample without polygon had no obvious fluctuation in the peripheral direction. The hardness of the polygon wheel sample changed with the profile. The hardness of the crest region is low, but the hardness of the trough region is high, and the thickness of the plastic deformation layer in the trough region is obviously greater than that in the crest region. Fatigue wear was the main damage of the trough region of polygonal wheel samples and non-polygonal wheel samples, and there are a large number of spalling pits on the surface of the crest region. The length and depth of the cracks at the crest and trough are significantly reduced and the crack angle is significantly increased compared with the non-polygonal wheel samples. The surface of polygonal wheel samples could be subjected to repeated wheel-rail impact-crushing actions, and the increase in normal force and slip ratio could make the impact-crushing actions more severe and the polygon of wheel more serious. The results could provide guidance for further understanding the mechanism of wheel polygon formation and the suppression measures.

Key words: wheel polygon, contact parameters, hardening, wear, rolling contact fatigue

CLC Number:

TH117

DING Haohao, ZHU Tingfeng, HUANG Jinwei, ZHANG Hua, CHEN Yong, LIN Qiang, WEN Zefeng, WANG Wenjian. Experimental Study on the Formation and Evolution of Wheel Polygon under Different Contact Parameters[J]. Journal of Mechanical Engineering, 2023, 59(15): 185-196.

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