德B_(21)型机冷车车轮径向崩裂和踏面横向裂纹的失效分析  

The Feliure Analysis about the Radial Breekings and Lateral Treed Crackles on Wheeis of the Germeny-mode Mechanical Retrigsrator Cars Type B_(21)

作　　者：卢观健[1] 张颖智[1] 朱德才 

机构地区：[1]铁道部科学研究院金化所

出　　处：《铁道车辆》1993年第7期6-10,4,共5页Rolling Stock

摘　　要：通过对B_(21)型机冷车车轮伤损概况和伤损车轮的性能、断口金相、残余应力等检验分析,指出该车轮径向崩裂和踏面横向裂纹的伤损性质是属于热疲劳裂纹。制动工况不当是产生热影响层和疲劳裂纹的主要原因。建议对B_(21)型机冷车的制动系统和制动工况进行检查分析,改善车轮制动条件。By in apection and analysis of the general condition of the damaged wheels,their performances, frscture metallograph, and the residual stresses,it is pointed out that the radial brakings, and lateral tread crackings are thermal fatigue cracks. The inadepuats braking conditions are the main cause to produce heat-effected metal layer and fatigue crackings. It is suggested that the braking system and its operating condition of the mechanical refrigerator car type B_(21) should be inspected and analysed.the breakiug condition of wheels should be improved.

关 键 词：冷藏力 车轮 裂纹 失效分析 

分 类 号：U272.503.3[机械工程—车辆工程]