Measurement of residual stresses in rails by neutron diffraction
Measurement of residual stresses in rails by neutron diffraction
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DOI：
10.1016/j.wear.2008.04.047
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发表时间：
2008-10
期刊：
影响因子：
5
通讯作者：
Toshihiko Sasaki;Shunichi Takahashi;Y. Kanematsu;Y. Satoh;K. Iwafuchi;M. Ishida;Y. Morii
中科院分区：
文献类型：
--
作者：
Toshihiko Sasaki;Shunichi Takahashi;Y. Kanematsu;Y. Satoh;K. Iwafuchi;M. Ishida;Y. Morii
滚动接触疲劳损伤是列车在轨道上反复行驶过程中，在轨道上积累的损伤，可能会由于滚动接触疲劳而产生初期裂纹。钢轨故障可能是由于钢轨上的裂纹增长造成的。为了防止此类钢轨失效，需要在精确的工程分析模型的基础上对钢轨内部裂纹的行为进行估计，并在裂纹发展到临界尺寸之前找到钢轨缺陷的检测方法。预计钢轨内残余应力分布对裂纹扩展速度有显著影响。本研究的目的是利用中子应变测量法测量钢轨的残余应力分布。测试样本取自日本一条服务线路使用了约6年（2.22亿吨）的铁轨。中子测量是用日本原子能机构的残余应力分析仪（RESA）进行的。本文介绍了在钢轨纵切片上的中子应变测量结果。
Rolling contact fatigue damage is accumulated in rails during the repeated passage of trains over the rails, and an incipient crack may initiate due to the rolling contact fatigue. Rail failures can occur due to crack growth in the rails. In order to prevent such rail failures, the estimation of the behavior of internal rail cracks is required on the basis of an exact engineering analysis model as well as a method to detect rail defects before the crack grows to critical size. It is expected that the residual stress distribution in a rail has a significant influence on the growth rate of the crack. The purposes of this study are to measure the residual stress distribution in rails utilizing the neutron strain measurement. The test samples were taken from rails used in a service line in Japan for about six years (222 million gross tons). The neutron measurement was conducted using the Residual Stress Analyzer (RESA) at the Japan Atomic Energy Agency (JAEA). This report presents the results of the neutron strain measurements on a longitudinal-cut slice of a rail.