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首页> 外文期刊>Physica status solidi, B. Basic research >Mass transport properties of auxetic (negative Poisson's ratio) foams
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Mass transport properties of auxetic (negative Poisson's ratio) foams

机译：膨胀（负泊松比）泡沫的传质性能

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An auxetic foam structure is described which has the property of widening when stretched (negative Poisson's ratio behaviour), in contrast to the situation with most materials which narrow when stretched. The fabrication of this material involves a combination of heat and compressive treatments of a conventional commercial air-filtration foam. The resulting microstructure is examined by scanning electron microscopy (SEM). The pertinent mechanical properties are described in terms of the changes in specimen dimensions and associated strains. From these quantities, Poisson's ratios are determined for the large strain regime involved. The property of being able to open pores by stretching the material is a useful feature in various types of filtration application. In particular, where the long-term efficiency of the process is hindered by ingress of particles into the system which block the active pore structure, the marriage of permeability and mechanical deformation via a negative Poisson's ratio offers an alternative to other methods of clearance. This notion is illustrated by the use of some very simple tests in which the foam is challenged by glass beads of uniform diameter. Simple air pressure-drop tests are also performed on auxetic and conventional foams to demonstrate that the change in permeability due to mechanical deformation enables a means of varying the pressure-drop acting across an auxetic foam to a far greater degree than is possible for the conventional foams.
机译：与大多数材料在拉伸时变窄的情况相反，描述了一种膨胀泡沫结构，其在拉伸时具有变宽的特性（负泊松比特性）。这种材料的制造涉及对常规商业空气过滤泡沫的热处理和压缩处理的组合。通过扫描电子显微镜（SEM）检查所得的微观结构。根据样品尺寸和相关应变的变化来描述相关的机械性能。根据这些量，可以确定所涉及的大应变方案的泊松比。通过拉伸材料而能够开孔的特性是各种过滤应用中的有用特征。尤其是，由于颗粒进入阻止活性孔结构的系统而阻碍了该方法的长期效率，因此渗透率和机械变形的负泊松比结合可提供其他清除方法的替代方案。通过使用一些非常简单的测试就可以说明这一概念，其中，泡沫受到直径均匀的玻璃珠的挑战。还对膨胀性和常规泡沫进行了简单的压降测试，以证明由于机械变形而引起的渗透率变化使得与传统泡沫相比，可以更大程度地改变作用在膨胀性泡沫上的压降。泡沫。

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