Vliv reziduálního pnutí na statické chování kolejnice

Abstract

The issue of track-bridge interaction is relatively broad and includes wide range of input parameters, which are currently under investigation as part of research projects focused on this problem. Measurement of existing bridge structures, rails, numerical models and so forth are under investigation.

The issue of track-bridge interaction is relatively broad and includes wide range of input parameters, which are currently under investigation as part of research projects focused on this problem. Measurement of existing bridge structures, rails, numerical models and so forth are under investigation. One of the parameters that have an influence on longitudinal resistance of the rail is the residual stress field in it. For the past years residual stresses were under investigation mainly because they have a big influence on the fatigue resistance of the rail which is one of the failure modes for the steel rail. The primary purpose of this study is to investigate the influence of the residual stresses on flexural behaviour of the rail. Bending resistance of two specimens will be experimentally studied: new rail with residual stresses and heat treated piece with relieved residual stresses. Finite Element Model (FEM) will be developed to simulate the test. Map of residual stresses is introduced in numerical model of the rail and it is based on the evaluation and analysis of a number of researches that were done in this area. In order to check compatibility of the chosen pattern with our specimens, residual stresses in an additional - third specimen will be checked according to simplified procedure described in EN 13674-1 Annex C.