Preprint Article Version 1 This version is not peer-reviewed

# Relative Lagrangian Formulation of Finite Thermoelasticity

Version 1 : Received: 25 August 2017 / Approved: 27 August 2017 / Online: 27 August 2017 (11:36:35 CEST)

How to cite: Liu, I.; Teixeira, M.G. Relative Lagrangian Formulation of Finite Thermoelasticity. Preprints 2017, 2017080095 (doi: 10.20944/preprints201708.0095.v1). Liu, I.; Teixeira, M.G. Relative Lagrangian Formulation of Finite Thermoelasticity. Preprints 2017, 2017080095 (doi: 10.20944/preprints201708.0095.v1).

## Abstract

Besides the Lagrangian and the Eulerian descriptions, the motion of a body can also be expressed relative to the present configuration of the body, known as the relative motion description. It is interesting to consider such a relative motion description in general to formulate the basic system of field equations for solid bodies. In doing so, when the time increment from the present state is small enough, the nonlinear constitutive equations can be linearized relative to the present state so that the resulting system becomes linear. This will be done for thermoelastic materials with a brief comment on the exploitation of entropy principle in general. Relative Lagrangian formulation is based on the well-known small-on-large'' idea, and can be implemented for solving problems with large deformation in successive incremental manner. Some applications of such a formulation in numerical simulations are briefly reviewed.

## Subject Areas

relative Lagrangian formulation; thermoelastic solid; small on large; successive linear approximation; boundary value problem