Abstract

In this work, a generalized method for measuring the Poisson's ratio of fabrics is presented. The basis of this method is the two-dimensional nature of the fabric deformation. Through this method, the measurement error is very low compared to conventional methods. In the following, the error of measurement in the conventional methods has been proved theoretically then an experiment with five different knitted fabrics and an elastic sheet is designed. In addition, an algorithm based on the image processing technique is presented to measure longitudinal, transverse and area strain. The results of fabrics showed that the theoretical prediction about the error of conventional methods was predicted correctly. In the case of the elastic sheet, the same result has been found, but it was not significant statistically. It is suggested that the proposed method is capable of replacing all available methods of measuring the Poisson's ratio of fabrics and structures like them.

摘要

在这项工作中，提出了一种测量织物泊松比的通用方法。这种方法的基础是织物变形的二维性质。通过这种方法，与传统方法相比，测量误差非常低。下面从理论上证明了传统方法的测量误差，然后设计了五种不同针织物和弹力片的实验。此外，提出了一种基于图像处理技术的算法来测量纵向、横向和区域应变。织物的结果表明，对常规方法误差的理论预测是正确的。在弹性片材的情况下，也发现了相同的结果，但在统计上并不显着。