Normalisation of shear test data for rate-independent compressible fabrics

Harrison, P., Wiggers, J. and Long, A.C. (2007) Normalisation of shear test data for rate-independent compressible fabrics. In: 10th ESAFORM Conference on Materials Forming, Zaragosa, Spain, 18-20 April 2007, pp. 1011-1016. ISBN 9780735404144 (doi: 10.1063/1.2729646)

Abstract

Normalisation methods for both Picture Frame (PF) and Bias Extension (BE) tests on rate-independent compressible fabrics undergoing trellis shear are presented. Normalisation of PF test results is relatively straightforward and involves dividing the force results by a characteristic length. A normalisation procedure for BE test results has been developed based on an energy argument that uses a number of simple assumptions to account for the non-uniform shear strain field induced across the whole of the BE samples during testing. A discussion of the more usual method of monitoring a gauge section of the deforming sample during tensile testing highlights potential problems that can occur as a result of the highly anisotropic nature of textile composites, problems that may lead to misinterpretation of data. The derivation and application of the energy method is relatively complicated but permits normalisation of results from samples with any length / width ratio. Smaller length / width specimen ratios have proved to be preferable since these samples tend to maintain their integrity better during testing than specimens with higher length / width ratios; an issue particularly important for more fragile fabrics.

• Item Type: Conference Proceedings
• Keywords: Polymer fibres, fibre reinforced composites, tensile testing, shear deformation.
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Harrison, Dr Philip
• Authors: Harrison, P., Wiggers, J., and Long, A.C.
• Subjects: T Technology > T Technology (General); T Technology > TJ Mechanical engineering and machinery
• College/School: College of Science and Engineering > School of Engineering > Systems Power and Energy; University Centres > Glasgow Materials Research Initiative
• ISBN: 9780735404144