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Variational methods in irreversible thermoelasticity: theoretical developments and minimum principles for the discrete form

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Abstract

A variational approach for fully coupled dynamic irreversible thermoelasticity is developed for continua, which considers both the conservative and dissipative character in terms of mixed variables. By introducing a consistent variational scheme for the spatial and temporal discretization of the governing equations, a mixed continuum element is established under the Hamiltonian-Lagrangian formalism. The proposed method leads to the development of minimum principles in discrete form with the proper selection of state variables and temporal action sum operators. Consequently, this novel mixed variational formulation can provide the basis for a class of optimization-based methods for irreversible thermomechanics. Several applications are considered to demonstrate the robustness of the proposed variational approach, including transient dynamic response of thermoelastic media due to surface heating caused by ramp- and step-type heat fluxes, and a sequence of laser pulses.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, University at Buffalo, State University of New York, Buffalo, NY, 14260, USA

    Georgios Apostolakis & Gary F. Dargush

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  1. Georgios Apostolakis
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  2. Gary F. Dargush
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Correspondence to Gary F. Dargush.

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Apostolakis, G., Dargush, G.F. Variational methods in irreversible thermoelasticity: theoretical developments and minimum principles for the discrete form. Acta Mech 224, 2065–2088 (2013). https://doi.org/10.1007/s00707-013-0843-0

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  • DOI: https://doi.org/10.1007/s00707-013-0843-0

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