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Sequential simulation of thermal stresses in disc brakes for repeated braking
Department of Mechanical Engineering, Jönköping University, Jönköping, Sweden.
Department of Mechanical Engineering, Jönköping University, Jönköping, Sweden.ORCID-id: 0000-0001-6821-5727
2013 (engelsk)Inngår i: Proceedings of the Institution of mechanical engineers. Part J, journal of engineering tribology, ISSN 1350-6501, E-ISSN 2041-305X, Vol. 227, nr 8, s. 919-929Artikkel i tidsskrift (Fagfellevurdert) Published
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Abstract [en]

In this paper, an efficient sequential approach for simulating thermal stresses in brake discs for repeated braking is presented. First, a frictional heat analysis is performed by using an Eulerian formulation of the disc. Then, by using the temperature history from the first step of the sequence, a plasticity analysis with temperature dependent material data is performed in order to determine the corresponding thermal stresses. Three-dimensional geometries of a disc and a pad to a heavy truck are considered in the numerical simulations. The contact forces are computed at each time step taking the thermal deformations of the disc and pad into account. In such manner, the frictional heat power distribution will also be updated in each time step, which in turn will influence the development of heat bands. The plasticity model is taken to be the von Mises yield criterion with linear kinematic hardening, where both the hardening and the yield limit are temperature dependent. The results show that during hard braking, high compressive stresses are generated on the disc surface in the circumferential direction which cause yielding. But when the disc cools down, these compressive stresses transform to tensile residual stresses. For repeated hard braking when this kind of stress history is repeated, we also show that stress cycles with high amplitudes are developed which might generate low cycle fatigue cracks after a few braking cycles.

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London, United Kingdom: Sage Publications, 2013. Vol. 227, nr 8, s. 919-929
Emneord [en]
Eulerian framework, frictional heat, thermal stresses, disc brake, repeated braking
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URN: urn:nbn:se:oru:diva-48271DOI: 10.1177/1350650113481701ISI: 000321702800014Scopus ID: 2-s2.0-84884572691OAI: oai:DiVA.org:oru-48271DiVA, id: diva2:904436
Tilgjengelig fra: 2016-02-18 Laget: 2016-02-15 Sist oppdatert: 2018-05-26bibliografisk kontrollert

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Rashid, AsimStrömberg, Niclas

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