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Zimmermann and Rolfes write: “Fig. 2 explains what is meant by permitting [local skin] postbuckling under ultimate load. Two load-shortening curves of an axially compressed stiffened panel are shown. First buckling (local buckling of the skin between the stringers) and collapse (maximum load) are indicated by dots and crosses, respectively. The design for Weight 1 is dominated by a statement as to limit load (here: first buckling load is close to limit load), which presently is common practice. The design for reduced Weight 2 is dominated by a statement concerning ultimate load (ultimate load is a bit less than collapse load). To go further into the post[local]buckling regime without loss of structural life requires improved, fast and reliable procedures for analysis and design of stiffened fibre composite panels.”
FROM:
R. Zimmermann and R. Rolfes (University of Hannover, Institute for Structural Analysis, Appelstr. 9A, D-30167 Hannover, Germany), “POSICOSS—improved postbuckling simulation for design of fibre composite stiffened fuselage structures”, Composite Structures, Vol. 73, No. 2, pp. 171-174, May 2006
ABSTRACT: The European Commission was funding within its fifth Framework Programme the project POSICOSS, which coped with the demand to design fibre composite fuselage structures for postbuckling under ultimate load. The main objective of the work was the development of improved, fast and reliable procedures for postbuckling analysis and design of fibre composite stiffened panels of future fuselage structures. They were essential, because so far postbuckling calculations were extremely time consuming and as such not applicable for design. Another substantial objective was the creation of comprehensive experimental data bases for the purpose of validation. The paper presents an introduction to the POSICOSS project; it derives the main objective of the project from the main general objectives for the design of the next generation of aircraft structures, and it summarizes the work done. The results achieved are only touched, because details of them can be found by consulting the references given.
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