Australian Digital Theses Program

Thesis Details
Title	Studies on Wheel/Rail Contact – Impact Forces at Insulated Rail Joints
Author	Pang, Tao
Institution	Central Queensland University
Date	2008
Abstract	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. 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 static analysis and the results transferred to dynamic analysis for impact simulations. The explicit FE method was employed in the dynamic analysis. The Lagrange Multiplier method and the Penalty method for contact constraint enforcement were adopted for the static and dynamic analyses respectively. The wheel/rail contact-impact in the vicinity of the end post is exhibited via numerical examples from the FE modelling. The wheel/rail contact impact mechanism is investigated. The strain gauged experiments which consist of a lab test and a field test are reported. The signature of the strain time series from the field test demonstrates a plausible record of the dynamic responses due to the wheel/rail contact impact. By using the experimental data, both the static and the dynamic FE models are validated. It is found that the stiffness discontinuity of the IRJ structure causes a running surface geometry discontinuity during the wheel passages which then causes the impact in the vicinity of the end post. Through a series of sensitivity studies of several IRJ design parameters, it is shown that the IRJ performance can be effectively improved with optimised design parameters.
Thesis	01Front.pdf 186.5 Kb 02Chapter1.pdf 20.2 Kb 03Chapter2.pdf 1991.2 Kb 04Chapter3.pdf 179.3 Kb 05Chapter4.pdf 1511.4 Kb 06Chapter5.pdf 1060.2 Kb 07Chapter6.pdf 1631.7 Kb 08Chapter7.pdf 110.7 Kb 09Chapter8.pdf 21.4 Kb 10References.pdf 34.8 Kb 11_Pang_Complete_IRJ_Impact_Forces_Thesis-2007.pdf 6767.6 Kb