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首页> 外文期刊>Journal of intelligent material systems and structures >Mechanical properties of shape memory polymer composites enhanced by elastic fibers and their application in variable stiffness morphing skins
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Mechanical properties of shape memory polymer composites enhanced by elastic fibers and their application in variable stiffness morphing skins

机译：弹性纤维增强的形状记忆聚合物复合材料的机械性能及其在变刚度变质蒙皮中的应用

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摘要

Shape memory polymers are temperature-controlled variable stiffness materials, which have potential for use as morphing skins. Shape memory polymer skins undergo large strain in their flexible, rubbery state and resist aerodynamic loads in their stiff, glassy state. However, pure shape memory polymers are brittle in their glassy state, and in their rubbery state, they tear rapidly along micro-cracks formed under tension. Due to these disadvantages, the shape memory polymers are not safe and reliable enough for application. In this article, elastic fibers were mixed into pure shape memory polymers to solve these problems. The mechanical properties of the shape memory polymer composites were investigated. The strength and Young's modulus of pure shape memory polymers at high temperature were improved by elastic fibers, and the toughness of pure shape memory polymers at room temperature (glassy state) was enhanced with acceptable reduction in Young's modulus. The tear strength of shape memory polymers was significantly improved by elastic fibers, especially at high temperature. Recovery properties and thermal performance were also discussed. Finally, shape memory polymer composite skins were used in a variable camber wing structure to demonstrate their application.
机译：形状记忆聚合物是温度控制的可变刚度材料，具有用作变形皮肤的潜力。形状记忆聚合物蒙皮在其柔软的橡胶状状态下承受较大的应变，并在其坚硬的玻璃状状态下抵抗空气动力负荷。然而，纯形状记忆聚合物在其玻璃态下是脆性的，并且在其橡胶态下，它们会沿着在张力下形成的微裂纹迅速撕裂。由于这些缺点，形状记忆聚合物对于应用而言不够安全可靠。在本文中，将弹性纤维混入了纯形状记忆聚合物中以解决这些问题。研究了形状记忆聚合物复合材料的机械性能。弹性纤维提高了纯形状记忆聚合物在高温下的强度和杨氏模量，并且随着杨氏模量的可接受的降低，提高了纯形状记忆聚合物在室温（玻璃态）下的韧性。弹性纤维显着改善了形状记忆聚合物的撕裂强度，尤其是在高温下。还讨论了恢复性能和热性能。最后，将形状记忆聚合物复合蒙皮用于可变弯度机翼结构，以演示其应用。

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