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| Effects of Wheel and Rail Wear on Wheel/Rail Contact Behavior in Turnout Zone |
| WANG Ping，LIU Zhe |
| (MOE Key Laboratory of High - speed Railway Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031， China) |
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Abstract Research purposes :For the serious wear problems happened between wheel and switch rail， the actual profiles of worn LM type wheel and worn switch rail in the operating routes have been measured by the Shanghai Meichi station as test background. Based on the wheel - rail contact traces princij^le and finite element theory， the contact problem between wheel and switch rail was solved， and the effects of worn profiles on wheel and switch rail^s contact geometry relationship，contact stress， size of contact patch and Von Mises stress were analyzed， which provides the theoretical basis for the profiles optimization and grinding of switch rail. Research conclusions :( 1) Because of the worn profiles of wheel and switch rail，the distribution of wheel - rail contact points have been changed，the wheel load transition range has been shorten and the amplitude and fluctuation of wheel - rail contact vertical irregularity have been increased，which has increased the wheel - rail interaction and makes the wear damage more serious in turnout zone. (2) The wear can improve the contact comfort between the wheel and rail，and reduce the wheel - rail contact stress and Von Mises stress. (3) The maximum Von Mises stress of the switch rail occurs within the range from 2. 7 mm to 4. 5 mm under the rail surface， where the contact fatigue cracks can be easily generated. (4) The research results can provide the guidance for the profiles optimization of switch rail.
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Received: 02 September 2015
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2016, Vol. 33 
