Study on stable configurations and snap through of the rectangular VS bi-stable laminates with curvilinear fiber alignment

IF 6.3 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Composite Structures Pub Date : 2024-09-18 DOI:10.1016/j.compstruct.2024.118588

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Abstract

With advances in fiber placement technology, variable stiffness bistable laminates (VSBL) composited by curvilinear fiber format become a subject of intense interest for morphing structures due to their lower weight, adjustable stiffness and a richer range of stable configurations compared to straight fiber bistable laminate. Merely conducting research on square laminates is not enough allowing for practical application scenarios. This article investigates the influence of geometrical parameters of VSBL on the stable state configuration and static snap through actuated by MFC systematically. A quadratic variable curvature polynomial is used to fit the transverse displacement according to classical laminate theory. By means of von-Karman geometrical relationship and the Rayleigh-Ritz method, stable configurations of the VS bistable laminate are solved. By comparing with finite element results, the reliability and precision of the current results are verified. It shows that changing fiber orientation leads to significant effects on the steady state configuration and critical bifurcation points. Theoretical analysis of VS bistable laminates containing the smart piezoelectric material MFC is followed by analytical modeling. The voltage threshold required for actuating snap through of two stable states is acquired by smart material layer MFC. The specific reasons for the differences in the configurations of VS bistable laminates are illustrated by analyzing distribution of the stiffness of VSBL in the plane.

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具有曲线纤维排列的矩形 VS 双稳态层压板的稳定构型和卡突研究

随着纤维铺放技术的进步，与直纤维双稳态层压板相比，由曲线纤维格式合成的可变刚度双稳态层压板（VSBL）具有重量轻、刚度可调、稳定配置范围更广等优点，因此成为变形结构领域的一个热门话题。仅仅对方形层压板进行研究还不足以满足实际应用的需要。本文系统地研究了 VSBL 的几何参数对 MFC 驱动的稳定状态配置和静态快穿的影响。根据经典层压板理论，采用二次变曲率多项式拟合横向位移。通过 von-Karman 几何关系和 Rayleigh-Ritz 方法，求解了 VS 双稳态层压板的稳定构型。通过与有限元结果的比较，验证了当前结果的可靠性和精确性。结果表明，改变纤维取向会对稳态配置和临界分叉点产生显著影响。在对含有智能压电材料 MFC 的 VS 双稳态层压板进行理论分析后，还建立了分析模型。通过智能材料层 MFC 获取了驱动两种稳定状态快速通过所需的电压阈值。通过分析 VSBL 在平面上的刚度分布，说明了 VS 双稳态层压板配置差异的具体原因。

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来源期刊

Composite Structures 工程技术-材料科学：复合

CiteScore

12.00

自引率

12.70%

发文量

1246

审稿时长

78 days

期刊介绍： The past few decades have seen outstanding advances in the use of composite materials in structural applications. There can be little doubt that, within engineering circles, composites have revolutionised traditional design concepts and made possible an unparalleled range of new and exciting possibilities as viable materials for construction. Composite Structures, an International Journal, disseminates knowledge between users, manufacturers, designers and researchers involved in structures or structural components manufactured using composite materials. The journal publishes papers which contribute to knowledge in the use of composite materials in engineering structures. Papers deal with design, research and development studies, experimental investigations, theoretical analysis and fabrication techniques relevant to the application of composites in load-bearing components for assemblies, ranging from individual components such as plates and shells to complete composite structures.