| U71Mn钢轨焊缝处核伤扩展寿命的估算 |
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| 引用本文： | 马昌红.U71Mn钢轨焊缝处核伤扩展寿命的估算[J].铁道学报,2011(11):76-79. |
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| 作者姓名： | 马昌红 |
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| 作者单位： | 山东交通学院数理系; |
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| 摘 要： | 根据包兰线银川段U71Mn 50kg/m钢轨运营情况,在应力比R为0.1、0.5条件下对钢轨轨头焊缝处材料进行三点弯曲疲劳裂纹扩展速率测试。采用七点递增多项式法进行回归分析,得出其裂纹扩展速率材料常数C和m。按照50kg/m钢轨实际尺寸建立模型,利用ANSYS有限元分析软件计算其轨顶动弯应力,并根据Paris公式对焊缝处钢轨进行使用寿命估算。相同运营情况下,若核伤由可探测范围(核伤直径不小于10mm)扩展至核伤面积占轨头面积的30%,则应力比为0.1时,容许通过总质量不超过8.65Mt,运营时间不超过87d;应力比为0.5时,容许通过总质量不超过6.28Mt,运营时间不超过63d。研究成果可为确定线路探伤周期和正确评价钢轨运营现状提供依据。
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| 关 键 词： | 焊缝 裂纹扩展速率 核伤 疲劳寿命 动弯应力 |
Life Evaluation of U71Mn Rails at the Position of Welds with Corewound Propagation |
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| MA Chang-hong.Life Evaluation of U71Mn Rails at the Position of Welds with Corewound Propagation[J].Journal of the China railway Society,2011(11):76-79. |
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| Authors: | MA Chang-hong |
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| Institution: | MA Chang-hong(Department of Mathematics and Physics,Shandong Jiaotong University,Jinan 250023,China) |
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| Abstract: | According to the transport conditions of U71Mn 50kg/m rails in the Yinchuan section of the Baolan Railway Line,the fatigue crack propagation rate of welds at rail heads was tested by three-point bending experiments under different stress ratios of 0.1 and 0.5.The coefficients of the material of the tested fatigue crack propagation speed ratios were obtained by regression analysis with the seven point incremental polynomial method.The ANSYS FEM models were built on the basis of the real measurements of the 5... |
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| Keywords: | welds crack propagation rate corewound for rail fatigue life dynamic bending stress |
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