The stability of composite material stiffened conical shells under uniform axial compression and with classical clamped boundary conditions is investigated. The effects of stiffeners are uniformly distributed over the whole surface of the shell, and the shell is treated as an equivalent orthotropic shell. A method of solution is developed by using energy principles and Rayleigh-Rize approximations. It is shown that the approach proposed in this paper is practical, effective and satisfactory.
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