摘要
将考虑荷载作用次序的损伤曲线法与考虑荷载相互作用的疲劳损伤法相结合,修正了非线性疲劳损伤累积模型,提出基于非线性疲劳损伤累积的钢轨疲劳裂纹萌生-磨耗共存发展预测方法,并与其他线性和非线性疲劳损伤累积模型的预测结果进行对比.结果发现:非线性疲劳损伤累积模型计算的累积损伤高于线性疲劳损伤累积模型的结果,其中非线性疲劳损伤累积修正模型得到的损伤累积最大,相应的裂纹萌生寿命最小;对U75V热处理钢轨来说,非线性疲劳损伤累积修正模型预测的裂纹萌生寿命为车轮通过次数约2.58×105次,裂纹萌生于钢轨次表面,距离钢轨表面深度约2.12mm,平均磨耗发展率为2.90μm/万次;Miner线性疲劳累积模型预测的裂纹萌生寿命接近现场观测值的上限,非线性疲劳损伤累积修正模型预测的裂纹萌生寿命接近观测结果中值.
The nonlinear fatigue damage cumulative model was modified by combining the damage curve method considering the order of loading sequence and the fatigue damage method considering the interaction of the load.Based on nonlinear fatigue damage cumulation,aprediction method for coexistence of fatigue crack initiation and wear of rail was proposed and compared with the linear and nonlinear fatigue damage cumulative models.It was found that the cumulative damage calculated by the nonlinear fatigue damage cumulative model was higher than that of the linear fatigue damage cumulative model,in which the cumulative damage of the modified nonlinear fatigue damage model was the largest and the corresponding head check initiation life was the smallest.Taking the U75 Vheat-treated rail as the research object,results of the modified nonlinear fatigue damage cumulative model showed that head check initiation life was 2.58×105 and head check initiated at sub-surface of rail,which was 2.12 mm deep to the rail top and the average wear rate was2.90μm every ten thousand times.The results of Miner linear fatigue cumulative model were close to the upper limit of the observed results and that of the modified nonlinear fatigue damage cumulative model were close to the median of observation results.
引文
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