标题： 一种异常降低细长纤维增强复合结构刚度的铰链效应 显示英文标题

标题： A hinge effect that anomalously decreases the stiffness of slender fiber-reinforced composite structures

摘要： 我们提供了关于嵌入纤维导致纤维增强聚合物复合材料刚度异常降低的实验证据。 带有碳纤维的壳体在压缩载荷下表现出约20%的刚度降低和100%的强度增加。 我们通过纤维拔出测试排除了由于浸渍不完善导致的纤维脱粘作用，该测试表明纤维-基体界面在纤维方向上是牢固的。 因此，我们假设纤维允许基体材料像铰链一样绕其旋转。 我们通过分析模型和实验数据验证了这一现象，我们称之为铰链效应，适用于嵌入细长复合梁中的纤维的小变形和大变形。 我们还展示了利用嵌入纤维实现山折和谷折的可折叠和可展开板的设计。 此外，铰链效应需要进一步研究纤细复合结构中纤维如何产生异常柔性的物理机制。 这种效应可以被有效地用于设计新型折纸结构和柔性且坚固的顺应机构。 显示英文摘要

摘要： We present experimental evidence for an anomalous decrease in stiffness in a fiber-reinforced polymer composite because of the embedded fiber. A shell with carbon fiber showed about 20% less stiffness and 100% more strength under compressive loading. We ruled out the role of debonding of fiber due to imperfect impregnation by using a fiber-pullout test, which revealed that the fiber-matrix interface is strong in the direction of the fiber. Therefore, we hypothesize that a fiber allows the matrix material to rotate around it as in a hinge. We corroborate this phenomenon, which we call the hinge effect, with analytical modelling and experimental data for small and large deformations of a fiber embedded in slender composite beams. We also demonstrate the design of foldable and deployable sheets with hill and valley folds enabled by the embedded fibers. Moreover, the hinge effect warrants further research into physics of how fibers in slender composite structures give rise to the anomalous flexibility. This effect can be gainfully used in designing novel origami structures and compliant mechanisms should be flexible and strong.