Study on fatigue property of T joint using S350EW ultra weathering steel in Green-Giant railway bullet train
In order to quickly and efficiently evaluate the fatigue life of S350EW/BH500EW-Ⅱ welded joint made of super weathering steel and weld wire for"Green Giant"railway bullet train,the fatigue performance of Q350EW/BH500EW-Ⅱ weathering steel T joint was studied by numerical simulation method based on general finite element software platform and special module.The fatigue performance of T joint was measured in practice.The results showd that the developed fatigue life calculation method had high calculation accuracy.The predicted fatigue life of T joint specimens under the loading conditions of 160 MPa,200 MPa and 270 MPa was basically consistent with the experimental results.The results of the supplementary validation experiment under 270 MPa load fall between the predicted values of the two methods,which were the same order of magnitude.Compared with the experimental results of small samples without residual stress,the life predicted by the structural stress method was conservative.This was because the residual stress in the small size fatigue sample was released,and the influence of welding residual stress was ignored.In addition,as the size was reduced,the probability of defects contained in the joint was relatively small,and then the fatigue life calculation results were high.
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