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Proc Math Phys Eng Sci. 2016 Dec;472(2196):20160690. doi: 10.1098/rspa.2016.0690.

The anelastic Ericksen problem: universal eigenstrains and deformations in compressible isotropic elastic solids.

Author information

  • 1School of Civil and Environmental Engineering and The George W. Woodruff School of Mechanical Engineering , Georgia Institute of Technology , Atlanta, GA 30332, USA.
  • 2OCCAM, Mathematical Institute , University of Oxford , Oxford OX1 3LB, UK.

Abstract

The elastic Ericksen problem consists of finding deformations in isotropic hyperelastic solids that can be maintained for arbitrary strain-energy density functions. In the compressible case, Ericksen showed that only homogeneous deformations are possible. Here, we solve the anelastic version of the same problem, that is, we determine both the deformations and the eigenstrains such that a solution to the anelastic problem exists for arbitrary strain-energy density functions. Anelasticity is described by finite eigenstrains. In a nonlinear solid, these eigenstrains can be modelled by a Riemannian material manifold whose metric depends on their distribution. In this framework, we show that the natural generalization of the concept of homogeneous deformations is the notion of covariantly homogeneous deformations-deformations with covariantly constant deformation gradients. We prove that these deformations are the only universal deformations and that they put severe restrictions on possible universal eigenstrains. We show that, in a simply-connected body, for any distribution of universal eigenstrains the material manifold is a symmetric Riemannian manifold and that in dimensions 2 and 3 the universal eigenstrains are zero-stress.

KEYWORDS:

eigenstrain; geometric mechanics; nonlinear elasticity; residual stress; universal deformation

PMID:
28119554
PMCID:
PMC5247530
[Available on 2017-12-01]
DOI:
10.1098/rspa.2016.0690
[PubMed]
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