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Thermomechanical fatigue of grey cast iron brake discs for heavy vehicles
Chalmers Univ Technol, Sweden.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Chalmers Univ Technol, Sweden.
Chalmers Univ Technol, Sweden; AF Ind AB, Sweden.
2019 (English)In: Proceedings of the Institution of mechanical engineers. Part D, journal of automobile engineering, ISSN 0954-4070, E-ISSN 2041-2991, Vol. 233, no 2, p. 453-467Article, review/survey (Refereed) Published
Abstract [en]

The development of fatigue life assessment models for vehicle components exposed to thermomechanical fatigue supports the establishing of adequate maintenance intervals that neither cause unnecessary vehicle downtime, nor jeopardize the function of the components. In modern automotive applications, braking is closely related to safety and is commonly performed with disc brakes. Failure here may result in structural damage or even breakdown and loss of lives. In the present work, the cyclic response of grey cast iron is analysed and the fatigue life of brake discs made from this material is studied by use of four different fatigue life assessment models: the Smith-Watson-Topper model, the Coffin-Manson model and two mechanism-based damage models. Results from isothermal and thermomechanical experiments on uniaxially loaded specimens are used for calibration of the models. Finally, the models are used to assess the life of a brake disc for a simulated brake dynamometer experiment. It is found that the fatigue model parameters that are calibrated using different sets of isothermal uniaxial test data show a substantial spread. A comparison with results from full-scale brake rig experiments shows that predictions by any of the models that have been calibrated using data from a well-designed thermomechanical test are in reasonable agreement with the estimated crack initiation phase for actual brake disc lives. It can be concluded that it is not sufficient to calibrate the studied fatigue life models using isothermal uniaxial tests for predictions of thermomechanical fatigue lives.

Place, publisher, year, edition, pages
SAGE PUBLICATIONS LTD , 2019. Vol. 233, no 2, p. 453-467
Keywords [en]
Disc braking; cast iron; fatigue life assessment models; laboratory experiments; thermomechanical fatigue
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-155587DOI: 10.1177/0954407017739723ISI: 000459888000022OAI: oai:DiVA.org:liu-155587DiVA, id: diva2:1297823
Note

Funding Agencies|government agency VINNOVA in the area Vehicle Development of the FFI Programme [2012-03662, 2012-03625]; Transport Area of Strength at Chalmers

Available from: 2019-03-21 Created: 2019-03-21 Last updated: 2019-05-10

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Norman, Viktor
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CiteExportLink to record
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Citation style
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