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Minimum stiffness criterion for ring frames of stringer frame stiffened shell structures
https://orcid.org/0000-0003-3927-4909
Abstract Stringer frame stiffened shell structures have been able to establish themselves as primary structures of aerospace applications because of their high ratio of load carrying capacity to weight. Unfortunately, this advantage goes hand in hand with a high level of complexity in the design of such structures. This is due to the many design variables and the complex physical behaviour caused by the interaction of stringer, frame and shell. Despite the many research activities carried out, the behaviour of such a structure under axial compression is not fully understood yet and reliable methods for an efficient calculation are lacking. In particular, the state-of-the-art sizing of frames is still based on an empirical method established in the 1950s. Within this paper, new minimum stiffness criteria are developed for the sizing of frame stiffener of stringer frame stiffened shell structures under axial compression. A novel but not fully reliable sizing method and a novel calculation method for the calculation of the panel instability load serve as a basis. For the derivation of a criterion, two different approaches are chosen and compared to each other. One approach incorporates the frame stiffnesses locally, whereas the other on a global level. Geometrically non-linear finite element analyses are performed to verify the proposed approach. The results reveal that the local consideration of the frame stiffness does not represent the physical behaviour of the shell sufficiently, whereas the minimum stiffness criterion, which incorporates the frame stiffness on a global level, delivers excellent predictions of the minimum frame stiffness.
Highlights Two minimum stiffness criteria based on the real physical behaviour of the shell. Local incorporation of frames not sufficient to describe global buckling. Global buckling calculation insufficient using the classic smeared stiffener theory. Derived method shows superior prediction capability of the minimum frame stiffness.
Minimum stiffness criterion for ring frames of stringer frame stiffened shell structures
https://orcid.org/0000-0003-3927-4909
Abstract Stringer frame stiffened shell structures have been able to establish themselves as primary structures of aerospace applications because of their high ratio of load carrying capacity to weight. Unfortunately, this advantage goes hand in hand with a high level of complexity in the design of such structures. This is due to the many design variables and the complex physical behaviour caused by the interaction of stringer, frame and shell. Despite the many research activities carried out, the behaviour of such a structure under axial compression is not fully understood yet and reliable methods for an efficient calculation are lacking. In particular, the state-of-the-art sizing of frames is still based on an empirical method established in the 1950s. Within this paper, new minimum stiffness criteria are developed for the sizing of frame stiffener of stringer frame stiffened shell structures under axial compression. A novel but not fully reliable sizing method and a novel calculation method for the calculation of the panel instability load serve as a basis. For the derivation of a criterion, two different approaches are chosen and compared to each other. One approach incorporates the frame stiffnesses locally, whereas the other on a global level. Geometrically non-linear finite element analyses are performed to verify the proposed approach. The results reveal that the local consideration of the frame stiffness does not represent the physical behaviour of the shell sufficiently, whereas the minimum stiffness criterion, which incorporates the frame stiffness on a global level, delivers excellent predictions of the minimum frame stiffness.
Highlights Two minimum stiffness criteria based on the real physical behaviour of the shell. Local incorporation of frames not sufficient to describe global buckling. Global buckling calculation insufficient using the classic smeared stiffener theory. Derived method shows superior prediction capability of the minimum frame stiffness.
Minimum stiffness criterion for ring frames of stringer frame stiffened shell structures
https://orcid.org/0000-0003-3927-4909
Abstract Stringer frame stiffened shell structures have been able to establish themselves as primary structures of aerospace applications because of their high ratio of load carrying capacity to weight. Unfortunately, this advantage goes hand in hand with a high level of complexity in the design of such structures. This is due to the many design variables and the complex physical behaviour caused by the interaction of stringer, frame and shell. Despite the many research activities carried out, the behaviour of such a structure under axial compression is not fully understood yet and reliable methods for an efficient calculation are lacking. In particular, the state-of-the-art sizing of frames is still based on an empirical method established in the 1950s. Within this paper, new minimum stiffness criteria are developed for the sizing of frame stiffener of stringer frame stiffened shell structures under axial compression. A novel but not fully reliable sizing method and a novel calculation method for the calculation of the panel instability load serve as a basis. For the derivation of a criterion, two different approaches are chosen and compared to each other. One approach incorporates the frame stiffnesses locally, whereas the other on a global level. Geometrically non-linear finite element analyses are performed to verify the proposed approach. The results reveal that the local consideration of the frame stiffness does not represent the physical behaviour of the shell sufficiently, whereas the minimum stiffness criterion, which incorporates the frame stiffness on a global level, delivers excellent predictions of the minimum frame stiffness.
Highlights Two minimum stiffness criteria based on the real physical behaviour of the shell. Local incorporation of frames not sufficient to describe global buckling. Global buckling calculation insufficient using the classic smeared stiffener theory. Derived method shows superior prediction capability of the minimum frame stiffness.
Minimum stiffness criterion for ring frames of stringer frame stiffened shell structures
Krause, Max (Autor:in) / Lyssakow, Pawel (Autor:in) / Schröder, Kai-Uwe (Autor:in)
Thin-Walled Structures ; 182
13.09.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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