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).
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Hållbar utveckling
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Transport
Materialvetenskap
Fundament
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