The dynamic instability analysis of truncated conical shell subjected to periodic in-plane load is investigated using C deg two-nodded shear flexible shell element. The present model accounts for in-plane and rotary inertia effects. The boundaries of he principal instability region obtained here are conveniently represented in the non-dimensioanl excitation frequency - non-dimension load amplitude plane. The influences of various parameters such as cone orthotropicity, cone angle, ply-angle and elastic edge restraint on dynamic stability are brought out.
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