Switchable structures using asymmetric fiber composite laminates: two case studies
Switchable structures using asymmetric fiber composite laminates: two case studies
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DOI：
10.1117/12.2612988
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发表时间：
2022-04
期刊：
影响因子：
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通讯作者：
Vishrut Deshpande;O. Myers;Suyi Li
中科院分区：
文献类型：
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作者：
Vishrut Deshpande;O. Myers;Suyi Li
非对称碳纤维增强复合材料在自适应结构应用中显示出巨大的潜力，如变形翼型、1-4和能量采集器。5由于用于其制造的单向板和强非线性行为，这些复合材料层压板可以显示出显著不同的载荷-位移响应沿着不同的加载方向。此外，非对称复合材料可以表现出双稳态，提供了一种在不同机械响应之间轻松切换的途径。本文提出了两种基于非对称复合材料的可切换结构概念。第一个概念利用了[0°/90° ]层合板在两个垂直面内方向上的两个不同响应。通过简单的卡扣，这种结构可以在刚性和柔性之间切换。初步实验表明，这两种结构之间的刚度比可以达到接近70：1。第二个概念是使用不对称纤维复合材料和3D打印的柔性TPU材料以新颖的方式制造的Kresling折纸结构。由于其三角形复合刻面中的不对称叠层，Kresling结构可以从“可折叠”配置切换到“锁定”配置。实验研究了可折叠和锁定构型的轴向压缩和拉伸响应。这两个案例研究表明，在先进的和多功能的结构应用中，非对称纤维复合材料仍然有许多未开发的潜力。
Asymmetric carbon fiber reinforced composites have shown immense potentials in adaptive structure applications such as morphing airfoils,1–4 and energy harvesters.5 Due to the unidirectional prepregs used for their fabrication and strongly nonlinear behaviors, these composite laminates can show significantly different load-displacement responses along with different loading directions. Moreover, asymmetric composites can exhibit bistability, offering a pathway to easily switch between different mechanical responses. This paper presents two switchable structure concepts based on asymmetric composites. The first concept exploits two distinct responses in the [0°/90° ] laminates in two perpendicular in-plane directions. Via a simple snap-through, such structure can switch between stiff and compliant. Preliminary experiments show that it can achieve close to 70:1 stiffness ratio between these two configurations. The second concept is a Kresling origami structure fabricated in a novel way using asymmetric fiber composites and 3D-printed flexible TPU material. Due to the asymmetric layup in their triangular composite facets, the Kresling structure can switch from a “foldable” configuration to a “locked” configuration. Axial compression and tension response for foldable and locked configurations are experimentally investigated. These two case studies suggest that there are still many untapped potentials in the asymmetric fiber composites for advanced and multi-functional structural applications.