Engineering application of structural strain method of low cycle fatigue in railway freight carbody
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.
railway freight carlow cycle fatiguestructur-al strain methodvirtual test rig
NETL
NSTL
万方数据
