摘要
钢轨接头螺栓的疲劳失效与断裂使铁路运输的可靠性、安全性下降,是阻碍高速铁路发展的重要因素.因此,研究钢轨螺栓的疲劳性能具有重要的现实意义.首先通过预紧力矩与预紧力的转换公式,把预加载的螺栓力矩转换成预紧力,研究了在不同预紧扭矩作用下,预紧扭矩对钢轨接头螺栓疲劳失效特性的影响;其次通过理论计算,选择出最佳螺栓扭矩.最后在钢轨接头螺栓的三维实体模型基础上,施加已计算出的最佳预紧扭矩,用ANSYS Workbench疲劳分析模块对螺栓进行疲劳寿命估算.以上研究都说明钢轨接头螺栓最大的变形发生在螺母与钢轨夹板接触处的第一圈螺纹牙处.
Due that the fatigue failure and rail joint bolt breakage decrease the railway transport reliability and safety,the fatigue property of rail bolt impacts significantly on high-speed railway development.Firstly,the pre-loading bolt torque is converted into pre-tightening force via transformation formula of tightening torque and pre-tightening force by investigating the tightening torque into rail joint bolt fatigue failure under different pre-tension actions.Secondly,the preferred bolt torque is selected by theoretical calculations.Finally,based on three-dimensional solid model of rail joint bolt,the fatigue life is estimated using ANSYS WorkbenchTM fatigue analysis module.Therefore,it is indicated that the maximum bolt deformation occurs at contact areas of the first lap thread between nuts and rail plywood.
出处
《中国工程机械学报》
北大核心
2016年第2期104-108,共5页
Chinese Journal of Construction Machinery
基金
国家自然科学基金资助项目(51275079)
辽宁省百千万人才工程培养经费资助项目(2014921018)
