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Anisotropic ElasticityTheory and Applications$
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T. T. C. Ting

Print publication date: 1996

Print ISBN-13: 9780195074475

Published to Oxford Scholarship Online: November 2020

DOI: 10.1093/oso/9780195074475.001.0001

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Linear Anisotropic Elastic Materials

Linear Anisotropic Elastic Materials

(p.32) Chapter 2 Linear Anisotropic Elastic Materials
Anisotropic Elasticity

T. C. T. Ting

Oxford University Press

The relations between stresses and strains in an anisotropic elastic material are presented in this chapter. A linear anisotropic elastic material can have as many as 21 elastic constants. This number is reduced when the material possesses a certain material symmetry. The number of elastic constants is also reduced, in most cases, when a two-dimensional deformation is considered. An important condition on elastic constants is that the strain energy must be positive. This condition implies that the 6×6 matrices of elastic constants presented herein must be positive definite. Referring to a fixed rectangular coordinate system x1, x2, x3, let σij and εks be the stress and strain, respectively, in an anisotropic elastic material. The stress-strain law can be written as . . . σij = Cijksεks . . . . . .(2.1-1). . . in which Cijks are the elastic stiffnesses which are components of a fourth rank tensor. They satisfy the full symmetry conditions . . . Cijks = Cjiks, Cijks = Cijsk, Cijks = Cksij. . . . . . .(2.1-2). . .

Keywords:   acoustic tensor, central inversion, displacements, elastic stiffnesses, hexagonal materials, invariants, material symmetry, orthotropic materials, reflection symmetry, shear modulus

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