Bio: A. Böhmer is an academic researcher from Technical University of Berlin. The author has contributed to research in topics: Shakedown & Residual stress. The author has an hindex of 1, co-authored 1 publications receiving 23 citations.
TL;DR: In this paper, the authors show that the kind of hardening observed for rail steel has a considerable influence on the shakedown limit and the residual stresses provide the structure to shake down to pure elastic behaviour in subsequent load cycles up to a shakedown.
Abstract: Sliding friction between railway wheels and rails results in elevated contact temperatures and gives rise to severe thermal stresses at the wheel and rail surfaces. The thermal stresses have to be superimposed on the mechanical contact stresses. Due to the distribution of stresses, the rail surface is generally subjected to higher stresses than the wheel surface. The elastic limit is reduced and yield begins at lower mechanical loads. During the first cycles of plastic deformation, the material hardens and residual stresses build up. The residual stresses provide the structure to shake down to pure elastic behaviour in subsequent load cycles up to a shakedown limit. The kind of hardening observed for rail steel has a considerable influence on the shakedown limit. The shakedown limit is dropped to lower mechanical loads due to the thermal stresses in the rail surface as well. This might cause structural changes in the rail material and rail damage.
TL;DR: In this article, the effect of decarburisation on rolling contact fatigue and wear was investigated under water-lubricated rolling/sliding contact, and it was found that the wear rate of the rail disc increased while that of the wheel disc decreased.
TL;DR: In this paper, a finite element method (FEM) was used to study thermal-elastic-plastic deformation and residual stress after wheel sliding on a rail, where the consideration of sliding contact between the wheel and the rail was restricted to a two dimensional contact problem.
TL;DR: In this paper, the effects of friction coefficient and slip/roll ratio on the wear rate and rolling contact fatigue are investigated, and frictional heating effects have been found to increase the rate of damage accumulation by ratcheting, leading to increased wear and tendency for rolling contact fatigues.
TL;DR: In this paper, a coupled thermomechanical modeling procedure for the wheel-rail contact problem was presented and the flash-temperature and stress-strain responses when thermal effects are present.
TL;DR: In this paper, a multi-step FE modeling strategy has been proposed to predict the temperature evolution, thermo-mechanical response, surface fatigue life and wear behaviors in railway rail for multi wheel passages.