The Elastic Constants for Specimens Possessing Orthorhombic Symmetry

2 The Elastic Constants for Specimens Possessing Orthorhombic Symmetry 

There are three independent shear moduli Gi = 1/ 44, G2 = I/S55 and G3 = l/see corresponding to shear in the 23, 13 and 12 planes respectively. For a sheet of general dimensions, torsion experiments where the sheet is twisted about the 1, 2 or 3 axis will involve a combination of shear compliances. This will be discussed in greater detail later, when methods of obtaining the elastic constants are described. 

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