Metrological performance of the digital image analysis method applied for investigation of textile deformation

Abstract

In order to predict the behavior and properties of flexible textile materials, standard investigation methods are not always sufficient. A more detailed study is performed and additional results are obtained when the digital image analysis technique is adjusted to the standard test method. In this article, the digital image analysis method for the measurement of local deformations during uniaxial textile tension is presented and the measurement errors and reliability of the method are discussed. The mathematical model of the length change Δ lɛ measurement was estimated and the uncertainty sources were identified. The maximum values of combined standard uncertainty was estimated to be equal to 0.13 mm and the expanded uncertainty U( x) for deformation variations was equal to 0.26 mm. Experiments and obtained quantitative and qualitative parameters of the method are adequate and satisfy the requirements of accuracy applied to material science. Therefore, the proposed uncertainty evaluation can be used as a tool in decision making under the application of the image analysis method for the investigation of deformed textile materials.