Open Access

ARTICLE

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

Da Cui^1,2, Daokui Li^1,2,*, Shiming Zhou^1,2

1 College of Aerospace Science and Engineering, National University of Defense Technology, Changsha, 410073, China
2 Hunan Key Laboratory of Intelligent Planning and Simulation for Aerospace Missions, Changsha, 410073, China

* Corresponding Author: Daokui Li. Email:

(This article belongs to the Special Issue: Mechanics of Composite Materials and Structures)

Computer Modeling in Engineering & Sciences 2022, 130(1), 415-441. https://doi.org/10.32604/cmes.2022.017368

Received 07 May 2021; Accepted 16 July 2021; Issue published 29 November 2021

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 extension-twisting 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. Multi-coupled 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.

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Keywords

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