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There are 4 behavioral constraints:
1. the maximum allowable stress shall not be exceeded.
2. The plate will not buckle under the axial compression, Nx, applied by itself or under the in-plane shear loading, Nxy, applied by itself.
3. The minimum free vibration frequency of the unloaded plate shall exceed a minimum allowable value.
4. The maximum normal displacement under the pressure loading shall not exceed an allowable value.
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