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首页> 美国卫生研究院文献>Biomimetics >Bioinspired Temperature-Responsive Multilayer Films and Their Performance under Thermal Fatigue
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Bioinspired Temperature-Responsive Multilayer Films and Their Performance under Thermal Fatigue

机译：生物启发的温度响应多层膜及其在热疲劳下的性能

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摘要

The structure of certain nonliving tissues determines their self-shaping and self-folding capabilities in response to a stimulus. Predetermined movements are realized according to changes in the environmental conditions due to the generated stresses of the multilayer anisotropic structure. In this study, we present bioinspired responsive anisotropic multilayer films and their fabrication process which comprises low-cost techniques. The anisotropic multilayer materials are capable of deforming their geometry caused by small temperature changes (<40 °C). The mismatch in the thermo-mechanical properties between three or more anisotropic thin layers creates responsive materials that alter their shape owing to the developed internal stresses. The movements of the material can be controlled by forming anisotropic homogenous metallic strips over an anisotropic thermoplastic layer. As a result, responsive multilayer films made of common materials can be developed to passively react to a temperature stimulus. We demonstrate the ability of the anisotropic materials to transform their geometry and we present a promising fabrication process and the thermal fatigue resistance of the developed materials. The thermal fatigue performance is strongly related to the fabrication method and the thickness of the strips. We studied the thermal fatigue performance of the materials and how the thermal cycling affects their sensitivity, as well as their failure modes and crack formation.
机译：某些非生物组织的结构决定了它们对刺激的自我塑造和自我折叠的能力。根据由于多层各向异性结构的产生的应力而引起的环境条件的变化来实现预定的运动。在这项研究中，我们介绍了生物启发的响应各向异性多层膜及其制造工艺，其中包括低成本技术。各向异性多层材料能够因温度变化小（<40°C）而变形。三个或更多个各向异性薄层之间的热机械性能不匹配，会形成响应性材料，这些材料由于内部应力的产生而改变其形状。可以通过在各向异性热塑性层上形成各向异性均质金属条来控制材料的运动。结果，可以开发由普通材料制成的响应性多层膜以对温度刺激进行被动反应。我们证明了各向异性材料改变其几何形状的能力，并且我们提出了一种有前途的制造工艺和已开发材料的抗热疲劳性能。热疲劳性能与带的制造方法和厚度密切相关。我们研究了材料的热疲劳性能，以及热循环如何影响其敏感性以及它们的破坏模式和裂纹形成。

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