钢轨核伤容许限度的研究及探伤周期

Study on Critical Crack Size in Rails With Transverse Defect and Crack Detection Cycles

本文应用线弹性断裂力学理论分析计算了U71Mn,50kg/m短轨轨头横向裂纹(又称核伤)在复杂应力状态下的K_Ⅰ及K_Ⅱ应力强度因子,给出了裂纹扩展速率及剩余寿命曲线,确定了钢轨核伤的容许限度及线路探伤的周期,为核伤钢轨的安全性运用提供了理论及试验依据。

This paper in which linear elastic fracture mechanics is applied analyses and calculates the stress intensity factor K_Ⅰ & K_Ⅱ of 50kg/m rail-head transverse defects under complex stress conditions, and gives crack propagation rate and expected life curve of rails with transverse defects. Permissible critical crack size and crack detection cycle are also defined, thus providing the basis for the appraisal of the safe use of rails with transverse defects.