Elastic scalar invariants in the theory of defective crystals

Abstract
In the context of a continuum theory of crystals with defects, the elastic scalar invariants are functions of the lattice vectors and their spatial gradients which remain invariant under elastic changes of state. In particular, the lattice components of the dislocation density tensor are prototypical of elastic scalar invariants of the first order, in the sense that any such invariant which depends just on the lattice vectors and their first spatial gradient turns out to be a function of those components. More generally, a representation theorem for elastic scalar invariants of arbitrary finite order is proven.

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