Study On The Changing Mechanism Of Working Rail Stress

Railway transportation is very significant for the development of the nationaleconomy, railway development is related to the national economy and people’slivelihood, rail is one of the indispensable important parts in the railwaytransportation, its quality directly affects the safety of train operation, speed, stabilityand comfort, but the modernization of railway high-speed, heavy-load andhigh-density transport organization make the rail worse and worse, these can affectthe normal operation of the rail. It may lead to the significant losses in the economy,while a major accident may occur and threatening passengers’ safety.This paper is based on the real geometry and boundary conditions of wheel andrail, then using ANSYS to build the model of60kg/m U75V heavy rail and the wearregions of LM and running the ANSYS/LS-DYNA3D software to analysing theinternal stress values and their variation of the heavy rail when repeated wheel rollingand sliding on the heavy rail. And on this basis, we got to analyse the y-stress、z-stressand Von mises stress on both the heavy rail’s sections of z=1250mm and z=1620mmwhen the wheel rolled on the heavy rail ten times as a certain speed and compare thetwo sections of the value and distribution of every stress. And finally it found therelationship between the times that the wheel rolled on the heavy rail and the innerstress values.In order to research the y-stress、z-stress and Von mises stress on both the heavyrail’s sections of z=1250mm and z=1620mm when repeated wheel rolling and slidingon the heavy rail. This paper selected wheel axle loads of25tons,30tons,35tons totake the numerical analysis and got the relationship between wheel axis load and allstress values.In this paper, the contact between wheel and heavy rail takes into account notonly the dynamic contact, but also the effect of sleeper supporting for the rail internalstress and the relation between wheel rolling cycle and internal cumulative residualstress. It possesses theory basis and reference value for prevention of all kinds offailure forms.