Rolling contact stress in aluminothermic weld joints plays a crucial role in rail rolling contact fatigue issues.In this study,static tensile tests were conducted to investigate the fundamental mechanical properties of parent rail material and weld metal.The Chaboche plastic constitutive equation was adopted to describe the mechanical response of both materials in the plastic regime.Utilizing ABAQUS software,the temperature field and residual stress field during the aluminothermic welding process were calculated.A finite element computational model was established to analyze rolling contact stress between wheel and rail,integrate the assessment of weld residual stress with the calculation of rolling contact stress in the weld zone.This led to the proposal of a method for calculating rail-wheel rolling contact stress that accounts for the presence of welding residual stress.Lastly,the characteristics of the local stress field within the weld were analyzed.The results show that:(1)The edges of the weld bear higher contact pressures compared to the center,and the presence of residual stress exacerbates rolling contact stress and contact pressure at the weld edges.(2)As the number of wheel revolutions increases,plastic strain accumulates in the weld,consequently influencing the evolution of rail fatigue damage.
aluminothermic weldingwelding thermal processweld residual stressrolling contact stressfinite element
NETL
NSTL
万方数据
