Hi all,
[1] In solids, the wave propagation equation is obtained from stress equilibrium equations. We make use of constitutive and strain-displacement relations to convert these equations in terms of displacements
[2] In the above equations we assume that there are no body loads.
[3] The form of solution we assume for displacements is harmonic
[4] Plug these three displacements, u1, u2 and u3 in the equilibrium equations stated in [1].
[5] We end up with an Eigenvalue problem. This is nice.
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