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Universality in anisotropic linear anelasticity

Abstract:
In linear elasticity, universal displacements for a given symmetry class are those displacements that can be maintained by only applying boundary tractions (no body forces) and for arbitrary elastic constants in the symmetry class. In a previous work, we showed that the larger the symmetry group, the larger the space of universal displacements. Here, we generalize these ideas to the case of anelasticity. In linear anelasticity, the total strain is additively decomposed into elastic strain and anelastic strain, often referred to as an eigenstrain. We show that the universality constraints (equilibrium equations and arbitrariness of the elastic constants) completely specify the universal elastic strains for each of the eight anisotropy symmetry classes. The corresponding universal eigenstrains are the set of solutions to a system of second-order linear PDEs that ensure compatibility of the total strains. We show that for three symmetry classes, namely triclinic, monoclinic, and trigonal, only compatible (impotent) eigenstrains are universal. For the remaining five classes universal eigenstrains (up to the impotent ones) are the set of solutions to a system of linear second-order PDEs with certain arbitrary forcing terms that depend on the symmetry class.
Publication status:
Published
Peer review status:
Peer reviewed

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Publisher copy:
10.1007/s10659-022-09910-7

Authors

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Institution:
University of Oxford
Division:
MPLS
Department:
Mathematical Institute
Oxford college:
St Catherine's College
Role:
Author
ORCID:
0000-0002-6436-8483


Publisher:
Springer
Journal:
Journal of Elasticity More from this journal
Volume:
150
Pages:
241-259
Publication date:
2022-07-13
Acceptance date:
2022-06-16
DOI:
EISSN:
1573-2681
ISSN:
0374-3535


Language:
English
Keywords:
Pubs id:
1265200
Local pid:
pubs:1265200
Deposit date:
2022-06-24
ARK identifier:

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