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Thermomechanical fatigue of brake disc materials--results from modelling and experiments

Gaël Le Gigan (Institutionen för tillämpad mekanik, Dynamik) ; Roger Lundén (Institutionen för tillämpad mekanik, Dynamik) ; Tore Vernersson (Institutionen för tillämpad mekanik, Dynamik)
Proceedings EuroBrake 2012 p. EB2012-MS-31.
[Konferensbidrag, refereegranskat]

The loads and the material response of a brake disc in the actual braking situation are complicated to analyse. In order to study thermomechanical fatigue, test specimens having controlled boundary conditions are regularly employed. In the present paper, results from analytical modelling, finite element modelling and experiments are analysed and compared for a constrained TMF test. Standard rheological material models, adapted to account for the tension-compression asymmetry with respect to yield for the studied gray cast iron, are used to study investigate the specific TMF test set-up. It is found that the stress evolution during testing can be well described using the studied models. Assessment of fatigue laws from the literature gives mixed results, highlighting the importance of finding damage parameters for the actual studied material.

Nyckelord: disc braking, cast iron alloy, thermal stress, thermomechanical fatigue, analytical modelling, FE analysis, laboratory experiments



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Denna post skapades 2012-12-13. Senast ändrad 2013-06-03.
CPL Pubid: 167683