Wheel rail contact thesis

Wheel rail contact thesis


The main target of this study is to assess FE analysis procedure and effective parameters of 3-D rolling contact using FE analysis in low adhesion and low speed conditions in which there is lack of such an.Railway vehicles are fitted with coned wheels to provide a measure of stability, but it can be shown that since the forces between wheel and track are non-conservative.De Pater, "The general theory of the motion of a single wheelset moving through a curve with constant radius and cant," Journal of Applied Mathematics wheel rail contact thesis and Mechanics, vol.The tiny contact zone (approximately 1 cm 2) where steel wheel meets steel rail is fundamental to rail transport.These unique features originate from the wheel–rail guidance system.Various friction coefficients, wavelengths and amplitudes of corrugated rails as well as braking times are considered in this study.SUBJECT TERMS Rolling contact fatigue, RCF, rail gauge corner cracking, wheel tread cracking, monitoring RCF,.The in-service properties therefore vary with depth below the surface and with position across the wheel tread Wiest et al.The research presented in this thesis has identified and developed a sophisticated Wheel/Rail Contact Force for the Bogie Leading Wheel (Type 1) Figure 4.7 Detection of wheel defects 31 1.It means wheel rail contact is not continuous and the contact history in the time domain consist of series of transient contact condition with impact.The results are linked to the observed rolling contact fatigue resistance of railway wheels The research presented in this thesis has identified and developed a sophisticated Wheel/Rail Contact Force for the Bogie Leading Wheel (Type 1) Figure 4.The research that is described in this thesis is based upon the formulation and analysis of mathematical models of railway vehicle and track systems."To investigate the wheel/rail contact impact forces at insulated rail joints (IRJs), a three-dimensional finite element model and strain gauged experiments are employed and reported in this thesis.In recent years similar types of defects—so-called studs—that are visually resembling squats, have started to appear.Three-dimensional (3D) elasto-plastic finite element model (FEM) was used in this thesis to examine the wheel-rail contact on a straight track.A wheel-rail contact formulation for analyzing the nonlinear train-structure interaction that takes into account the wheel and rail geometry is proposed.4 ORGANIZATION OF THE THESIS 38.The tangential force that a braking or tractive railway wheel can exert on a rail is limited by the friction.The first step deals with the problem of the shape ratio; it is proposed to compensate the two main.But in the case of a rolling wheel, something new happens.CHAPTER 2 STEADY STATE RESPONSE OF ELASTICALLY SUPPORTED CONTINUOUS BEAM UNDER A MOVING LOAD/MASS.CHAPTER 2 STEADY STATE RESPONSE OF ELASTICALLY SUPPORTED CONTINUOUS BEAM UNDER A MOVING LOAD/MASS.The research that is described in this thesis is based upon the formulation and analysis of mathematical models of railway vehicle and track systems.The results indicate that, in the wheel-rail contact area, the rail corrugation affects the contact pressure and temperature.

Thesis rail wheel contact


The flash temperature in an asperity of the rail due the wheel–rail rolling contact is investigated.As George Fowler, Senior Investigator at ….To this end, the research described in this thesis is twofold: theoretical; in which the wheel - rail contact is modelled in terms of contact and friction, and., (Logston & Itami, 1980), (Tomberger,.It might seem improbable, but as explained in Section R2020, when the wheel applies a traction force to the rail there is an intermediate stage in which the wheel and rail surfaces flow at different speeds through the contact patch..The 3D wheel/rail contact-impact FE model adopts a two stage analysis strategy in which the wheel-IRJ railhead contact is first established in the.The model considers the wheel and the rail as elastic deformable bodies and requires numerical solution of Navier's elasticity equation.Simulation of this dynamic changing contact and the.To find out more, see our Privacy and Cookies policy.Martin M: The Effect of Geometrical Contact Input to Wheel-Rail Contact Model, Master of Science Thesis, TRITA-SCI-GRU ; 2018:346, KTH, Stockholm, Sweden, 2018.To study the influence of interacting wheel and rail profile topology of standard rail UIC60, the standard wheel profile as per.This leads to the following research questions: 1.The results are linked to the observed rolling contact fatigue resistance of railway wheels Safety and economy of railway traffic is enormously influenced by the contact stress variation caused by wheel rail contact profile changes.Properties determined by correlating the measured friction between wheel and rail and the developed friction model.These parameters always affect wheel-raid contact and their values change significantly during the year Low Adhesion in the Wheel-Rail Contact.The contact between vehicle wheel and rail is a very complex phenomenon that can be considered as an imperfect link because of the high concentrated stresses that occur, the relative sliding of the wheelset with respect to the rail and the presence of dust, rain, sand or even ballast stones.While most of the existing methods treat the contact forces as external forces, the present formulation uses a finite element to model the behavior in the contact interface, based on Hertz's.Some sub-components of the track such., braking or traction) force over the normal force at the wheel-rail contact.8 1B – Rail Bending Moment at Sleeper A (Type 2) Figure wheel rail contact thesis 4.46, In Memory of Joost Kalker, pp.The contact area for this application is very small, well under 1 square inch per wheel Proceedings of the 11th International Conference on Contact Mechanics and Wear of Rail/wheel Systems, CM 2018 has an h-index of 3.Abstract In this work an innovative elastic wheel–rail contact model is presented.The purpose of this thesis is to analyze the fatigue crack growth by three-dimensional modeling, and life estimation in the railway wheel/rail due to the wheel/rail contact under the influence of.Adhesion, or adhesion coefficient, is given by the ratio of the longitudinal tangential (i.4 Wheel-rail contact model 21 1.Simulation of this dynamic changing contact and the.Some sub-components of the track such.Effect of wheel-rail contact point position on the accuracy of dynamometric wheelsets (Ing.It means 3 articles of this conference and proceedings have more than 3 number of citations.The change from a wheel tread–rail head contact to a wheel flange–rail gauge contact usually implies a higher slip component, which can be related to a higher sliding velocity.8 1B – Rail Bending Moment at Sleeper A (Type 2) Figure 4.Simulation of this dynamic changing contact and the.The contact between vehicle wheel and rail is a very complex phenomenon that can be considered as an imperfect link because of the high concentrated stresses that occur, the relative sliding of the wheelset with respect to the rail and the presence of dust, rain, sand or even ballast stones.In contrast to conventional rolling contact fatigue of rails.