Waves in elastic materials

Waves in elastic materials 

• Many substances can be distorted by applying a force to the materials. Often the materials are elastic under small  perturbations: i.e. the original shape is restored when the force is removed.
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• Forces above the elastic limit cause the material to permanently distort.
   
• The general theory of elastic materials is complicated because in many substances the elastic properties depends on the direction in the material.

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