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首页> 外文期刊>Physica status solidi, B. Basic research >Quantitative analysis of the microscale of auxetic foams
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Quantitative analysis of the microscale of auxetic foams

机译：膨胀泡沫微观尺度的定量分析

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The auxetic foams first produced by Lakes have been modelled in a variety of ways, each model trying to reproduce some observed feature of the microscale of the foams. Such features include bent or broken ribs or inverted angles between ribs. These models can reproduce the Poisson's ratio or Poisson's function of auxetic foam if the model parameters are carefully chosen. However these model parameters may not actually reflect the internal structure of the foams. A big problem is that measurement of parameters such as lengths and angles is not straightforward within a 3-d sample. In this work a sample of auxetic foam has been imaged by 3-d X-ray computed tomography. The resulting image is translated to a form that emphasises the geometrical structure of connected ribs. This connected rib data are suitably analysed to describe both the microstructural construction of auxetic foams and the statistical spread of structure, that is, the heterogeneity of an auxetic foam. From the analysis of the microstructure, observations are made about the requirements for microstructural models and comparisons made to previous existing models. From the statistical data, measures of heterogeneity are made that will help with future modelling that includes the heterogeneous aspect of auxetic foams. (c) 2005 WILEY-VCH Verlag GmbH T Co. KGaA, Weinheim.
机译：Lakes首先生产的膨胀泡沫已通过多种方式建模，每种模型都试图重现泡沫微尺度的一些观察到的特征。这些特征包括弯曲的或折断的肋或肋之间的倒角。如果仔细选择模型参数，这些模型可以再现泊松比或膨胀泡沫的泊松函数。但是，这些模型参数实际上可能无法反映泡沫的内部结构。一个很大的问题是，在3维样本中，诸如长度和角度之类的参数的测量并不简单。在这项工作中，已经通过3-D X射线计算机断层摄影术拍摄了一个泡沫塑料样品。生成的图像被转换为​​强调连接的肋的几何结构的形式。对此连接的肋骨数据进行了适当的分析，以描述膨胀泡沫的微观结构和结构的统计分布，即膨胀泡沫的异质性。通过对微观结构的分析，可以观察到微观结构模型的要求以及与现有模型之间的比较。根据统计数据，进行了异质性测量，这将有助于将来的建模，其中包括发胀泡沫的异质性。 （c）2005 WILEY-VCH Verlag GmbH T Co.KGaA，Weinheim。

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