Abstract
Stress and strain tensors that arise in the expression of the stress power are called “conjugate variables”. More special is the term “dual variables” which has been introduced in connection with incremental constitutive relations of hypoelasticity and plasticity, where the rates of both tensors arise. We propose a rational rule from which the most natural form of tensor-valued kinematic and dynamic variables (strain and stress tensors) including their corresponding time rates can be deduced. Dual variables and their associated dual derivatives are characterized by the property that apart from the stress power also the incremental stress power is invariant under a group of transformations that corresponds to a set of physically reasonable intermediate configurations. We outline the precursory history of these concepts and then discuss in detail how the invariance properties can be realized in the various stress and strain measures. We finally demonstrate the concept in three different applications: The rate form of the principle of virtual work, the formulation of constitutive relations in viscoelasticity and the formulation of incremental constitutive assumptions of rate-independent plasticity.
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The authors want to thank Professors Kolumban Hutter and Ingo Müller for valuable and most stimulating comments
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Haupt, P., Tsakmakis, C. On the application of dual variables in continuum mechanics. Continuum Mech. Thermodyn 1, 165–196 (1989). https://doi.org/10.1007/BF01171378
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DOI: https://doi.org/10.1007/BF01171378