Towards thermomechanics of fractal media |
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Authors: | Martin Ostoja-Starzewski |
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Affiliation: | (1) Department of Mechanical Science & Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, 61801, U.S.A. |
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Abstract: | Hans Ziegler’s thermomechanics [1,2,3], established half a century ago, is extended to fractal media on the basis of a recently introduced continuum mechanics due to Tarasov [14,15]. Employing the concept of internal (kinematic) variables and internal stresses, as well as the quasiconservative and dissipative stresses, a field form of the second law of thermodynamics is derived. In contradistinction to the conventional Clausius–Duhem inequality, it involves generalized rates of strain and internal variables. Upon introducing a dissipation function and postulating the thermodynamic orthogonality on any lengthscale, constitutive laws of elastic-dissipative fractal media naturally involving generalized derivatives of strain and stress can then be derived. This is illustrated on a model viscoelastic material. Also generalized to fractal bodies is the Hill condition necessary for homogenization of their constitutive responses. |
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Keywords: | Random media viscoelastic material fractional calculus |
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