Generic separating sets for three-dimensional elasticity tensors

Abstract : We define what is a generic separating set of invariant functions (a.k.a. a weak functional basis) for tensors. We produce then two generic separating sets of polynomial invariants for 3D elasticity tensors, one made of 19 polynomials and one made of 21 polynomials (but easier to compute) and a generic separating set of 18 rational invariants. As a byproduct, a new integrity basis for the fourth-order harmonic tensor is provided.
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Submitted on : Wednesday, June 26, 2019 - 3:59:16 PM
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Rodrigue Desmorat, Nicolas Auffray, Boris Desmorat, Boris Kolev, Marc Olive. Generic separating sets for three-dimensional elasticity tensors. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, Royal Society, The, In press, 475 (2226), pp.20190056. ⟨10.1098/rspa.2019.0056⟩. ⟨hal-01966221v2⟩

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