4. Appendix A: Plate vibration
4.1 Propagation wave velocity in solids
In a solid, the coefficient of proportionality between stress and strain is an elasticity constant, usually expressed in N/m2.
We distinguish :
longitudinal modulus of elasticity or Young's modulus E (N/m2) ;
transverse modulus of elasticity or modulus of rigidity G (N/m2).
For all materials, there is a relationship between E and G defined by the Poisson's ratio: .
Moreover, two-dimensional solids have the property of being able to deform by bending.
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Appendix A: Plate vibration
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