Chapter 3 described the elastic behavior of isotropic materials — those whose properties are identical in every direction. Single-crystal materials and some polycrystalline materials with a preferential alignment of the crystallites in one direction are not isotropic. For example, the sapphire crystal in Fig. 1.6 has different physical properties, such as refractive index or elastic modulus, along the c and a axes. This Appendix tells how we describe the mechanical properties of anisotropic materials such as sapphire.
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