<b>Rail Surface Fatigue Assessment Using Numerical Simulation of the Concurrence of Short Crack Propagation and Wear</b>

Abstract

Over the past few years, rail head checking have been found on the gauge corner of heattreated rails. Simulations were carried out of a vehicle running through curves using multibody-dynamics simulation software to comprehend wheel loads, lateral forces and contact positions of the wheel and the rail etc., occurring during these runs. The results of the simulation were input into a finite element analysis algorithm of wheel/rail rolling contact to obtain the stress and traction distributions on the railhead. Finally, the concurrence of short crack propagation and wear on the railhead was simulated to study the effect of the curve radius and grade of steel used for the rails.

Influence mechanism of running sportswear fatigue based on BP neural network

“…The measurement method of bioelectrical signal sEMG (surface myoelectricity) is a comprehensive superposition of the electrical signals emitted by the relevant motor units during muscle contraction at the electrode in time and space, which can objectively and quantitatively reflect neuromuscular activities to a certain extent. sEMG's evaluation of muscle fatigue is mainly divided into two methods: time domain analysis and frequency domain analysis [9,10].…”

<b>The Recent Trends in Research on Contact Phenomena in the Railway System</b>

“…1 (c)). As part of efforts to address longterm deterioration of rails caused by wheel-rail rolling contact, much of which occurs in curved sections, a simulator was developed for analyzing cracking and progress of cracking in rails [5]. This analysis is based on quasi-static analysis to impose stress distribution on wheel-rail contact surfaces on crack-progress analysis.…”