Design of Multi-Coupled Laminates with Extension-Twisting Coupling for Application in Adaptive Structures

Abstract

The multiple coupling of composite laminates has a unique advantage in improving the macro mechanical properties of composite structures. A total of three hygro-thermally stable multi-coupled laminates with extensiontwisting coupling were presented, which were conducive to the formation of passive adaptive structures. Then, the multi-coupled laminates were used to design the bending-twisting coupled box structure, in which the configuration of laminate and box structure could be extended to variable cross-section configuration. The optimal design of stacking sequence was realized, the optimization objectives of which were to maximize bending-twisting coupling of box structure and extension-twisting coupling of laminate, respectively. The effects of multiple coupling on hygro-thermal stability, coupling, failure strength, buckling load, robustness and other comprehensive mechanical properties of laminates and box structures were analyzed by parametric modeling method. The results show that the extension-twisting coupling of laminate and the bending-twisting coupling of box structures can be greatly improved by 450% and 260% at maximum, respectively. Meanwhile, it would have a negative impact on the failure strength and buckling load, which, however, can be minimized by a reasonable paving method. Multicoupled laminates have good robustness, and the bending-twisting coupling helps improve robustness. Finally, the hygro-thermal stability and mechanical properties were verified by numerical simulation with finite element method.

Diagnosis of Neurological Disorders Rehabilitation Using Effective Feature Elimination and LSTM-RNN Classifier

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Elastic bounds of the coupling tensor of anisotropic composite laminates: a polar approach

“…Concerning the design of coupled laminates, we cite the works of York and co-workers, like e.g. [10][11][12][13][14][15]. For what concerns more theoretical aspects on B, a first work, introducing the concept of coupling degree, based on a tensorial norm, is [16] and a theoretical and numerical analysis of the consequences of orentation errors on coupling and quasi-homogeneity can be found in [17].…”