Abstract
The stress-strain curves were measured by the method of the uniaxial tension test. The theoretical stress-strain relation derived on the basis of generalized thermodynamics was tested by experiments. The material constants were determined from the best fitting of the experimental data with the stress-strain relation. It is shown that the material constants are temperature dependent.

Key words
elastic stress tensor, inelastic stress tensor, Cauchy stress tensor, Young's modulus, Poisson's ratio, yield stress

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