FE simulation of a cord-rubber composite tube subjected to bending due to operational loads on a railroad reverse curve with extremely low curve radius at sub-zero temperature

摘要

The aim of this study is to examine railw ay brake tubes subjected to bending due to operation on a railroad reverse curve with extremely low curve radius in case of critical load cases at -40°C. Firstly, kinematic simulation has been performed in order to determine the input prescribed displacements of the FE simulation. Then, FE model is presented for the critical positions, without and with internal pressure. Stress and strain states have been analysed. Finally, a standard deflection test has been carried out along with the FE model of the deflection test based on the material model of the FE model of bending for experimental validation. Tsai-Hill failure indices are lower than 1 and equivalent stresses in rubber liners are lower than tensile strength of rubber for all load cases, so material failure is not imminent regarding such extreme operating conditions. With internal pressure applied, maximum failure indices tend to be lower. The deflection test results are in good agreement with the corresponding FE model deflection results, validating FE model of operation (reverse curve, -40°C).