摘要
利用MMS-2A型微机控制摩擦磨损试验机研究了不同轴重下轮轨摩擦磨损性能。结果表明:随着轴重的增加,轮轨间的摩擦系数呈增大趋势,且轴重越大,摩擦系数趋于稳定后的波动系数越小,车轮和钢轨的磨损加剧,但轮轨材料硬度值的差异会导致磨损量的增幅差异;轮轨间接触应力的增加,会导致晶体滑移线向材料里层滑移深度增加,塑性变形层加厚;随着轴重的增加,车轮材料的磨损机制由黏着磨损逐渐向疲劳裂纹方向转变,钢轨材料主要变现为疲劳磨损,由疲劳短裂纹向疲劳长裂纹及多层剥落磨损转变。
The wear and damage characteristics of wheel/rail at different axle loads were investigated using a MMS-2A wheel / rail rolling wear testing apparatus. The results showed that the rolliag friction coefficient would increase with the increase of axle loads. The larger the axle load is ,the smaller the fluctuation coefficient of friction coefficient after it tended to be stabilized,and it will aggravation the wear of wheel/rail at the same time. However, the hardness of wheel/rail materials will result in the difference of the wear volume growth. The increasing of wheel-rail contact stress led to the crysted slip line slipping mare deeply frarn the surface, therefore the plastic deformation thickness increased. With the increasing of axle loads ,the surfiwe damage of wheel specimen transformed from adhesion damage to fatigue cracks. However,the rail surface damage is dominated by fatigue wear,it transformed from short fatigue cracks to long fatigue cracks and deep delamination.
出处
《机械设计与制造》
北大核心
2017年第8期36-38,共3页
Machinery Design & Manufacture
基金
国家自然科学基金项目(51405395)
河北省高等学校科学研究计划项目(QN2015257)
廊坊市科学技术研究与发展计划项目(2015011024)
北华航天工业学院博士科研基金项目(BKY201408)
关键词
轴重
摩擦
磨损量
塑性变形
疲劳裂纹
Axle Load
Friction
Wear Volume
Plastic Deformation
Fatigue Crack
