重载列车E级钢钩舌疲劳裂纹扩展条件及寿命预测  

Prediction of Fatigue Crack Growth Condition and Lifetime on Coupler Guard Arm Area of E Grade Steel of Burden Strain

作　　者：李晓慧[1] 谢基龙[1] 

机构地区：[1]北京交通大学机械与电子控制工程学院,北京100044

出　　处：《北京交通大学学报》2006年第4期102-104,108,共4页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金资助项目(19771070)

摘　　要：对重载列车E级钢钩舌进行了应力分析,导出了钩腕面裂纹的应力强度因子表达式.采用我国20 000 t列车车钩载荷谱,对钩腕面疲劳裂纹扩展的条件及扩展寿命进行了预测,并确定钩腕面裂纹的临界断裂尺寸,计算所得钩舌寿命与列车实际运行年限相一致.The stress of E-grade steel coupler knuckle was analyzed and the expression of stress intensity factor of the cracks on the coupler knuckle wrist area was given. Adopting 20000t coupler knuckle load spectrum, the condition and lifetime of fatigue crack growth on the area of coupler guard arm were predicted. The critical facture dimension of cracks on the area of coupler guard arm was also calculated. The life calculated is in accord with the practice servicing life.

关 键 词：钩舌 扩展寿命 应力强度因子 扩展门槛值 临界裂纹尺寸 

分 类 号：U270.34[机械工程—车辆工程]