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Stepped Moduli in Layered Composites

机译：层状复合材料中的阶梯模量

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摘要

This paper describes adaptive composites that respond to mechanical stimuli by changing their Young's modulus. These composites are fabricated by combining a shorter layer of elastic material (e.g., latex) and a longer layer of stiffer material (e.g., polyethylene and Kevlar), and fixing them together at their ends. Tension along the layered composite increases its length, and as the strain increases, the composite changes the load-bearing layer from the elastic to the stiff material. The result is a step in the Young's modulus of the composite. The characteristics of the step (or steps) can be engineered by changing the constituent materials, the number of layers, and their geometries (e.g., sinusoidal, hierarchical, two-dimensional web-like, rod-coil, embedded, and ring structures). For composites with more than two steps in modulus, the materials within the composites can be layered in a hierarchical structure to fit within a smaller volume, without sacrificing performance. These composites can also be used to make structures with tunable, stepped compressive moduli. An adaptation of these principles can generate an electronic sensor that can monitor the applied compressive strain. Increasing or decreasing the strain closes or opens a circuit and reversibly activates a light-emitting diode.
机译：本文介绍了通过改变杨氏模量来响应机械刺激的自适应复合材料。这些复合材料是通过将较短的一层弹性材料（例如，乳胶）和较长的一层较硬的材料（例如，聚乙烯和凯夫拉尔）结合在一起，并在其端部固定在一起而制成的。沿着层状复合材料的张力会增加其长度，并且随着应变的增加，复合材料会将承载层从弹性材料更改为刚性材料。结果是复合材料的杨氏模量增加了一步。可以通过更改组成材料，层数及其几何形状（例如，正弦波，分层，二维网状，杆状线圈，嵌入式和环形结构）来设计一个或多个步骤的特性。对于模量超过两个步骤的复合材料，复合材料中的材料可以分层结构分层以适合较小的体积，而不会牺牲性能。这些复合材料也可用于制造具有可调，阶梯式压缩模量的结构。这些原理的改编可以产生可以监测施加的压缩应变的电子传感器。增大或减小应变会闭合或断开电路，并可逆地激活发光二极管。

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  • 来源
    《Advanced Functional Materials》 |2014年第45期|7197-7204|共8页
  • 作者

    Ju-Hee So; Alok S. Tayi; Firat Gueder; George M. Whitesides;

  • 作者单位

    Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138, USA;

    Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138, USA;

    Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138, USA;

    Department of Chemistry and Chemical Biology Harvard University 12 Oxford Street, Cambridge, MA 02138, USA, Wyss Institute for Biologically Inspired Engineering Harvard University 60 Oxford Street, Cambridge, MA 02138, USA;

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