Search for: wheel-rail-contact
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    Stress Analysis & Life Assessment of Alestum Locomotive's Wheels using Analytical Techniques

    , M.Sc. Thesis Sharif University of Technology Shayannejad, Mohammad (Author) ; Adib Nazari, Saeed (Advisor)
    In this thesis contact problem between wheel and rail has been studied. Also rolling contact fatige (RCF) has been studied in detail. Unlike previous studies that have focused on FEM solution, in this study the problem has been formulated based on analytical methods. Evaluating the loads in wheel-rail contact zone is necessary to find the defects. This thesis presents the evaluation of the stress field inside elastic rolling bodies with an elliptic area of contact. This kind of model can be applied to wheel-rail contact mechanics. The problem has been solved for two main models: with friction and without friction. The results have shown that shear stress reaches the maximum magnitude... 

    Considering the Ctability of Train Movement Based on Wagons Arrangement

    , M.Sc. Thesis Sharif University of Technology Taheri Heravi, Reza (Author) ; Sayyadi, Hassan (Advisor)
    The main popuse of this Thesis is investigating of the different wagon arrangement effect on stability of the train set. So to gain this goal, one train with 10 wagons has been simulated. The model of the each wagon is Nonlinear with 40 DOF. 3 of the wagons are heavy and make 3 different kinds of arrangement by putting them at first, middle and the end of the train (HLL, LHL and LLH arrangements). Then these three arrangements have been simulated on two differen tracks and conditions, 1st Accelerating on curved track (320 R) with positive slope and 2nd decelerating on curved track with negative slope.We suppose that the contact is singular point and aslso contact equations have bben solved... 

    Rolling Contact Fatigue under Influence of Residual Stresses

    , M.Sc. Thesis Sharif University of Technology Masoudi Nejad, Reza (Author) ; Farahi, Gholamhossin (Advisor)
    Rolling contact fatigue (RCF) phenomena is important in reducing the fatigue life and increasing the cost of maintenance. Accurate prediction of crack growth on wheels and the influence of residual stresses by FEM modeling can affect the maintenance planning. Therefore, investigation of rolling contact fatigue and its effect on rolling members life seem necessary. The first step to solve a rolling contact fatigue problem is the residual stress determination. In this research, wheel/rail contact is assumed. A bandage wheel with accurate geometry using finite element method is studied. For this purpose, a 3D elastic-plastic finite element model in ANSYS is conducted using model. The...