Elastic, thermal expansion, plastic and rheological processes – theory and experiment

Asszonyi, Csaba and Csatár, Attila and Fülöp, Tamás (2016) Elastic, thermal expansion, plastic and rheological processes – theory and experiment. PERIODICA POLYTECHNICA-CIVIL ENGINEERING, 60 (4). pp. 591-601. ISSN 0553-6626

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Abstract

Rocks are important examples for solid materi- als where, in various engineering situations, elas- tic, thermal expansion, rheological/viscoelastic and plastic phenomena each may play a remarkable role. Nonequilibrium continuum thermodynamics provides a consistent way to describe all these as- pects in a unified framework. This we present here in a formulation where the kinematic quantities al- low arbitrary nonzero initial (e.g., in situ) stresses and such initial configurations which – as a con- sequence of thermal or remanent stresses – do not satisfy the kinematic compatibility condition. The various characteristic effects accounted by the ob- tained theory are illustrated via experimental results where loaded solid samples undergo elastic, ther- mal expansion and plastic deformation and exhibit rheological behaviour. From the experimental data, the rheological coefficients are determined, and the measured temperature changes are also explained by the theory.

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