Crack initiation caused by repeated local heating events – Modelling of possible mechanisms
Paper i proceeding, 2015

Thermally initiated damage mechanisms by short-term local surface heating of a rail or wheel have been examined. A Finite Element (FE) model incorporating phase transformation from near pearlitic steel to austenite, and then to martensite was built to examine developing strength and residual stress fields. The FE model also incorporates thermal contraction on tempering of the martensite by following heat pulses. The material is modeled as isotropic, but with properties varying with phase, temperature and tempering state. Different thermal sequences that could cause crack initiation are examined.

stud

martensite

residual stress

phase transformation

RCF crack cluster

squat

fatigue crack initiation

thermal damage

Finite element model

Författare

Johan Ahlström

Chalmers, Material- och tillverkningsteknik, Materialteknologi

Proceedings of the 10th International Conference on Contact Mechanics and Wear of Rail/Wheel Systems (CM2015).

Drivkrafter

Hållbar utveckling

Styrkeområden

Transport

Materialvetenskap

Fundament

Grundläggande vetenskaper

Ämneskategorier

Annan materialteknik