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Understanding the effects of stress on the coefficient of thermal expansion

Le, QX; Torero, JL; Dao, VTN; (2019) Understanding the effects of stress on the coefficient of thermal expansion. International Journal of Engineering Science , 141 pp. 83-94. 10.1016/j.ijengsci.2019.05.016. Green open access

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Abstract

Important coupled effects of stress and temperature change have long been recognised and taken into account in models assessing the performance of solid materials. However, due to incomplete understanding, existing models used for concrete are essentially empirical and lack rational basis. This limits their predictive capability and applicability range. In this paper, fundamental thermodynamics and continuum mechanics laws are used to obtain an expression that quantitatively predicts the effects of stress on the coefficient of thermal expansion. The newly-defined thermal expansion coefficient is then used to develop a rational model, which is shown to be capable of reliably quantifying the coupling effects of stress and temperature change. Good agreement between the model predictions, available data and observations is obtained. Equally important, all parameters of the developed model can be determined using simple tests. This enables a wide adoption of the model in practical engineering applications. While this paper uses data for concrete, the proposed model is developed from first principles and using fundamental physical laws. The model should thus be applicable to a wide range of solid materials.

Type: Article
Title: Understanding the effects of stress on the coefficient of thermal expansion
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ijengsci.2019.05.016
Publisher version: https://doi.org/10.1016/j.ijengsci.2019.05.016
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Thermal expansion coefficient, Load-induced thermal strain, Coupling effects, Fundamental physical laws, Hooke's law
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10078620
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