低周疲劳的结构应变法在铁路货车上的工程应用
Engineering application of structural strain method of low cycle fatigue in railway freight carbody
邵文东 1赵尚超 2李强 3裴宪军 4马巧艳 2李向伟2
作者信息
- 1. 北京交通大学,机械与电子控制工程学院,北京, 100044;中车齐齐哈尔车辆有限公司,齐齐哈尔, 161002
- 2. 中车齐齐哈尔车辆有限公司,齐齐哈尔, 161002
- 3. 北京交通大学,机械与电子控制工程学院,北京, 100044
- 4. 东南大学,机械工程学院,南京, 211189
- 折叠
摘要
为了开展铁路货车车体焊接结构的低周疲劳寿命预测,详细推导了理想弹塑性结构应变计算理论,基于计算理论进行了程序设计,并通过焊接接头试验进行了验证.进一步开展了平面应变焊接接头模型的仿真计算结果和结构应变法计算结果的对比,探讨结构应变法的使用条件.最后,将虚拟台架与结构应力变结合开展了快捷货车的低周疲劳寿命分析的工程应用.结果表明:提出的低周疲劳的结构应变方法及其计算程序,当结构应力与屈服强度的差值在 150 MPa以内时,理想弹塑性结构应变计算结果与实际结果一致,能够解决铁路货车低周疲劳寿命预测问题;当结构应力与屈服强度差值超过 150 MPa后,随着结构应力的增加,误差也增加.该文的研究为低周疲劳的结构应变法工程推广应用提供了良好的技术支撑.
Abstract
In order to solve the problem of low cycle fatigue life prediction of welded structure of railway freight car body,firstly,the structural strain calculation theory of low cycle fa-tigue under different yield states is derived,and the program is designed based on the calculation theory.and the theoretical verification is completed through the welded joint test.Secondly,in order to further illustrate the applicability of struc-tural strain method calculation theory of low cycle fatigue,the plane strain finite element model and structural strain theory are compared;finally,the engineering application of low cycle fatigue life analysis of express freight car is carried out by combining virtual bench with structural stress strain.The res-ults show that the structural strain method and program based on low cycle fatigue can solve the problem of low cycle fa-tigue of railway freight cars when the stress of welded struc-ture is higher than the yield strength 150 MPa,and the result of plane strain model is consistent with that of structural strain theory,but after exceeding the yield strength 150 MPa,the er-ror increases with the increase of structural stress.The re-search in this paper provides a good technical support for the popularization and application of structural strain method in low cycle fatigue.
关键词
铁路货车/低周疲劳/结构应变法/虚拟试验台Key words
railway freight car/low cycle fatigue/structur-al strain method/virtual test rig引用本文复制引用
基金项目
中车原创技术十年培育专项(2022CYY007)
出版年
2024
NETL
NSTL
万方数据