هادي امامي ممقاني

Rail welded joints are one of the most important and sensitive parts of the railway tracks which are always under different loadings during the operation. These different loads cause rail and welded joints to fatigue. Local irregularities on rail welded joints are one of the most important reasons of dynamic impact on rail welded joints and affect the rail weld fatigue life. In this study, in order to eva‎luate the rail weld fatigue life under the effect of dynamic impacts which produced by local irregularities on rail welded joints, an analytical algorithm consisting of moving (Train) and fixed subsystems (Track) modeled using Multi Body Dynamics (MBD) and Finite Elements Method (FEM) and connected by nonlinear contact between wheels and rail in order to eva‎luate the Wheel-Rail interaction force caused by rail weld local irregularities. In the following, a rail welded joint model in Abaqus presented in order to dynamic analysis and investigate the bending stress and fatigue life in rail welded joints. Increasing Wheel-Rail interaction force up to 130%, bending stress up to 35% and decreasing rail weld fatigue life up to 38% under the effect of irregularities long wavelength depth in rail welded joints, are the most important results in present study. Also, by studying the local irregularities geometry, it appears that the irregularity short wavelength has no effect on rail weld fatigue life in low speeds and irregularities short wavelength depth has much less effect on rail weld fatigue life than irregularity long wavelength depth. Since the reason of creating the irregularity long wavelength are irregularity short wavelength, rail weld fatigue life can be increased by controlling the irregularity short wavelength depth.

جوش درز ريل , عمر خستگي , اندركنش خط و قطار , ناهمواري موضعي

rail welded joint , fatigue life , Train - Track interaction , Local irregularity

Hadi Emami

Dr. Mohammadzade