Research Article
Free In-Plane Vibrations of Orthotropic Rectangular Plates by Using an Accurate Solution
Table 1
Essential conditions and stiffness matrixes for different boundary conditions.
| Boundary conditions | Corresponding stiffness matrixes (N/m) | Essential conditions |
| Free (F) | | Nxx = Nxy = 0 | Clamped (C) | | | Simply supported 1 (SS1) | | Nxx = 0, | Simply supported 2 (SS2) | | u = 0, Nxy = 0 | Elastic restrained (E) | | |
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