Contactless Optical Extensometer for Textile Materials

Michel Tourlonias (1) , Marie-Ange Bueno (1) , Laurent Bigue (1) , Bernard Durand (1) , Marc Renner (1)

1 MIPS - Modélisation, Intelligence, Processus et Système

In this paper we present a contactless extensometer. For some flexible materials, with great displacements and deformations, contact during measurement is not acceptable. In fact, contact measurement can modify the tensile behavior, as is the case for fibrous materials. Contactless extensometers usually have to print or glue some marks on the sample, which may cause problems during measurement. These extensometers typically use digital image processing to obtain deformation data. The principle used in this study uses the natural periodicity or surface patterns inherent in most textile materials without any image processing. During deformation the distance between two periods or pattern elements changes, allowing this method to measure the real-time modification of this in-plane distance. The extensometer consists of two parts: an optical device and a signal processing unit performing a Fourier analysis. Some results obtained during a tensile test on woven fabrics and non-wovens are presented here.

Mots clés: Contactless extensometer; optical setup; laser; Fourier analysis; textile fabrics; non-wovens

Domaines: Traitement du signal et de l'image [eess.SP]; Traitement du signal et de l'image [eess.SP]

Michel Tourlonias, Marie-Ange Bueno, Laurent Bigue, Bernard Durand, Marc Renner. Contactless Optical Extensometer for Textile Materials. Experimental Mechanics, 2005, 45 (5), pp.420-426. ⟨10.1177/0014485105057759⟩. ⟨hal-00913785⟩