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Design and characterization of an orthotropic accordion cellular honeycomb as one-dimensional morphing structures with enhanced properties
Journal of Sandwich Structures & Materials ( IF 3.9 ) Pub Date : 2022-01-27 , DOI: 10.1177/10996362211070249
Amin Farrokhabadi 1 , Mohammad Mahdi Ashrafian 2 , Mohammad Fotouhi 3
Affiliation  

This study develops the governing equations and characterizes the mechanical properties of a new orthotropic accordion morphing honeycomb structure containing periodic arrays of U-type beams reinforced with glass fibers. Castigliano’s second theorem is modified to develop the analytical equations to predict the deformation behavior of a single orthotropic ply under a combined axial, bending, and shear loadings. Accordingly, the elastic properties of the orthotropic structure including elastic stiffness, shear stiffness, and in-plane Poisson’s ratios are calculated by the developed equations. The honeycomb structure is manufactured by 3D printing, and the samples are subjected to tensile tests to experimentally validate the analytical solutions. Multiple finite element simulations are also used to validate the results. A good agreement is observed between the analytical solution, the experiments, and simulations, confirming the robustness of the analytical solution to predict the full elastic properties of the composite cellular. The results show that the periodic arrays of U-type and vertical beams can generate low in-plane stiffness in the morphing direction and high in-plane stiffness in the transverse direction, respectively. A zero Poisson’s ratio feature is achieved by employing straight beams which result in a high stiffness in the perpendicular direction. The proposed accordion cellular honeycomb structure exhibits the flexible response along the accordion shape direction, with a significant stiffness in its transverse direction. Moreover, the new orthotropic structure has considerably greater strain to failure in the morphing direction compared with a conventional isotropic configuration. These features prove that this type of structure can be applied for the aerospace morphing structures such as wings.



中文翻译:

正交各向异性手风琴蜂窝蜂窝的设计和表征作为具有增强性能的一维变形结构

本研究开发了控制方程并描述了一种新的正交各向异性手风琴变形蜂窝结构的机械性能,该结构包含用玻璃纤维增​​强的 U 型梁的周期性阵列。Castigliano 的第二个定理被修改以开发解析方程来预测单个正交各向异性层在组合轴向、弯曲和剪切载荷下的变形行为。因此,正交各向异性结构的弹性特性,包括弹性刚度、剪切刚度和面内泊松比,通过所开发的方程进行计算。蜂窝结构通过 3D 打印制造,样品经过拉伸测试以实验验证分析解决方案。多个有限元模拟也用于验证结果。在解析解、实验和模拟之间观察到了良好的一致性,证实了解析解在预测复合蜂窝的全部弹性性能方面的稳健性。结果表明,U型和垂直梁的周期性阵列分别可以在变形方向产生低平面内刚度和在横向产生高平面内刚度。零泊松比特征是通过采用在垂直方向上产生高刚度的直梁来实现的。所提出的手风琴蜂窝蜂窝结构沿手风琴形状方向表现出灵活的响应,在其横向具有显着的刚度。而且,与传统的各向同性配置相比,新的正交各向异性结构在变形方向上的失效应变要大得多。这些特点证明这种结构可以应用于机翼等航空航天变形结构。

更新日期:2022-01-27
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