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Analysis of multistable variable stiffness composite plates

机译：多稳态变刚度复合材料板分析

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摘要

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 when straight fibers are used. A solution to mitigate this effect in which the fibers are allowed to vary smoothly along the plane from one region to the other is analyzed. 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 laminate. The concept of a bistable Variable Stiffness Panel (VSP) 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 for aerospace applications, such as winglets or flaps.
机译：本文提出了一种基于变刚度复合板变形复合结构的新概念。本文提出的变刚度变形层压板是直纤维层压板的改良版，它由两个区域组成，一个区域对称，另一个区域不对称堆叠。由于两个区域相交处存在铺层不匹配，因此当使用直纤维时，预计会出现应力集中。分析了一种减轻这种影响的解决方案，在该解决方案中，允许纤维从一个区域到另一个区域沿着平面平滑地变化。设计了弯曲纤维遵循的特定轨迹，以便可以使用高级纤维铺放技术（AFP）来制造板。对层压材料进行有限元分析，以预测其在固化过程后可能获得的两种可能的稳定构型的平面外位移。然后，可通过施加力将板从一种形状卡扣到另一种形状。分析了这种咬合行为，并将其与原始的直纤维层压板进行了比较。由对称和不对称叠层区域组成的双稳态可变刚度面板（VSP）的概念可以保持纤维的切向连续性，在航空航天应用的变形或形状适应结构中（如小翼或襟翼）可能非常重要。

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  • 来源
    《Composite Structures》 |2013年第4期|34-46|共13页
  • 作者

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

  • 作者单位

    INECI, Institute) de Engenharia Mecanka e Gestao Industrial, Rua Dr. Roberto Frias 400, 4200-465 Porto, Portugal;

    DEMec, Faculdade de Engenharia, Universidade do Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal;

    DEM, Institute Superior Tecnico, Universidade Tecnica de Lisboa, Avenida Rovisco Pais, 1049-001 Lisboa, Portugal;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    bistable composites; unsymmetric composites; variable stiffness panels; morphing structures;

    机译：双稳态复合材料;不对称复合材料;变刚度板;变形结构;

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