A material is of coaxial type if the Cauchy stress tensor T and the strain tensor B are coaxial for all deformations. Clearly a hyperelastic material is of coaxial type if and only if it is isotropic. Here we present a weaker definition of materials of coaxial type. Anisotropic materials may be of a coaxial type in a weak sense if for a given specific B we have that TB = BT. We denote these materials B-coaxial. We show that for transverse isotropic materials weak coaxial constitutive equations may be characterized using universal relations. We discuss the impact of B-coaxial materials in the modeling of soft tissues. We conclude that B-coaxial materials are a strong evidence that in real world materials two anisotropic invariants are always necessary to model in a meaningful and correct way single fiber reinforced materials.

On the use of universal relations in the modeling of transversely isotropic materials

PUCCI, Edvige;SACCOMANDI, Giuseppe
2014

Abstract

A material is of coaxial type if the Cauchy stress tensor T and the strain tensor B are coaxial for all deformations. Clearly a hyperelastic material is of coaxial type if and only if it is isotropic. Here we present a weaker definition of materials of coaxial type. Anisotropic materials may be of a coaxial type in a weak sense if for a given specific B we have that TB = BT. We denote these materials B-coaxial. We show that for transverse isotropic materials weak coaxial constitutive equations may be characterized using universal relations. We discuss the impact of B-coaxial materials in the modeling of soft tissues. We conclude that B-coaxial materials are a strong evidence that in real world materials two anisotropic invariants are always necessary to model in a meaningful and correct way single fiber reinforced materials.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11391/1202878
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