Abstract: The regularity of bending of 100 m U75V steel straight rail during cooling process before straightening has been calculated by analyzing the boundary conditions of cooling of 100 m rail and using three-dimensional instantaneous non-linear finite element method. Results show that the bending deformation of the straight steel rail during cooling process is a repeat-cycling process, but the rail eventually is bent to the rail head ； with considering the friction between steel rail and cooling bed, after the straight steel rail finishing cooling the deforming feature of rail is straight at middle part, bent at both ends and scope of bent ends covering 18 m.

Key words: 100-m U75V Steel Rail, Bending of Rail before Straightening, Finite Element Method

摘要： 通过研究百米钢轨冷却的边界条件,采用三维瞬态非线性有限元法计算分析了百米U75V平直钢轨矫直前冷却过程中的弯曲变形变化规律。结果表明,平直钢轨在冷却过程中的弯曲变形是一个循环反复的过程,但钢轨最终是弯向轨头的;在考虑钢轨与冷床摩擦作用的情况下,平直钢轨终冷后,其变形特点是中间平直、两端弯曲,端部弯曲范围约为18 m。

关键词: 百米U75V钢轨, 矫直前钢轨弯曲度 , 有限元法