Possibilities of improving the local stability of stiffened and integral composite structures

Stiffened and integral composite constructions are widely used in modern rocket and space engineering. Local buckling of composite plates compressed along their long sides can cause failure of such structures. At present, there are no design methods that take into account all peculiarities of load-bearing shells made of composite materials. This paper presents calculation formulas derived to investigate the local buckling of the elements of stiffened composite panels and shells under various boundary conditions. The buckling coefficients of stiffened elements are presented and the numerical analysis of various types and structures of stiffened elements is performed. The application of the compromise optimization to provide simultaneous global and local stability of composite structures is discussed. It is shown that the use of advanced composites can considerably increase the load-bearing capacity of shells if the design of stiffened elements is optimal.

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