IMPERFECTION-SENSITIVITY OF CYLINDRICAL PANELS UNDER COMPRESSION USING KOITERS IMPROVED POSTBUCKLING THEORY

This paper deals with the use of Koiter's improved postbuckling theory in axial buckling of integrally stiffened cylindrical panels. Acording to Koiter's improved theory, the postbuckling coefficients are evaluated at the actual applied load rather than at the classical buckling load. Substantial positive shift of the postbuckling is found which indicates that the imperfection-sensitivity predicted by Koiter's 1945 general theory may significantly overestimate the degrading effects of these imperfections. Such a positive shift is especially crucial in studying mode interactions such as local and overall buckling mode interactions of stringer-reinforced cylindrical shells.