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ANALYSIS OF MULTISTABLE VARIABLE STIFFNESS COMPOSITE PLATES

Sousa, C. S.; Camanho, P. P.; Suleman, A.;

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This paper presents a new concept for morphing composite structures based on variable stiffness composite plates. The variable stiffness morphing laminate proposed in this paper consists in a modified version of a straight fiber laminate composed of two regions, one with symmetric and the other with unsymmetric stacking sequence. Since there is a lay-up mismatch where the two regions meet, stress concentrations are expected to occur. A solution to ameliorate this effect is analyzed in which the fibers are allowed to vary smoothly along the plane from one region to the other. The particular trajectories followed by the curved fibers were designed such that the plate can be manufactured using Advanced Fiber Placement technology (AFP). A finite element analysis of the laminate is performed to predict its out-of-plane displacements for the two possible stable configurations that may be obtained after the curing process. Then, the plate may be snapped from one shape to the other with the application of a force. This snap-through behavior is analyzed and compared with the original straight fiber plate. The concept of a bi-stable Variable Stiffness Plate composed of regions of symmetric and unsymmetric lay-ups that preserve the tangential continuity of the fibers could be of great importance in morphing or shape-adaptable structures, such as winglets or flaps.

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Palavras-chave: Bi-stable composites,Unsymmetric composites, Variable Stiffness Panels, Morphing Structures.,

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DOI: 10.5151/meceng-wccm2012-18944

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Como citar:

Sousa, C. S.; Camanho, P. P.; Suleman, A.; "ANALYSIS OF MULTISTABLE VARIABLE STIFFNESS COMPOSITE PLATES", p. 2629-2651 . In: In Proceedings of the 10th World Congress on Computational Mechanics [= Blucher Mechanical Engineering Proceedings, v. 1, n. 1]. São Paulo: Blucher, 2014.
ISSN 2358-0828, DOI 10.5151/meceng-wccm2012-18944

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