Influence of specimen pre-shear and wrinkling on the accuracy of uniaxial bias extension test results

Alsayednoor, J., Lennard, F. , Yu, W.R. and Harrison, P. (2017) Influence of specimen pre-shear and wrinkling on the accuracy of uniaxial bias extension test results. Composites Part A: Applied Science and Manufacturing, 101, pp. 81-97. (doi: 10.1016/j.compositesa.2017.06.006)

Abstract

The influence of unintended specimen pre-shear and out-of-plane wrinkling on the accuracy of shear angle and axial force results, measured during a uniaxial bias extension (UBE) test on engineering fabrics, is examined. Three techniques of measuring test kinematics are investigated, including manual image analysis, 2-D and 3-D full-field analysis. Error introduced by specimen pre-shear is shown to influence test results in different ways, depending on analysis technique. Procedures to take specimen pre-shear error into account when interpreting results are demonstrated, though an important recommendation resulting from this investigation is to minimise pre-shear as much as possible. Out-of-plane wrinkling is shown to create significant errors in kinematic data when using 2-D analysis methods (up to 20% overestimates of measured shear angle). It is shown that wrinkle-error can be corrected if 3-D stereoscopic analysis methods are employed.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: Harrison, Dr Philip and Lennard, Professor Frances and Alsayednoor, Dr Jafar
• Authors: Alsayednoor, J., Lennard, F., Yu, W.R., and Harrison, P.
• College/School: College of Arts > School of Culture and Creative Arts > History of Art; College of Science and Engineering > School of Engineering > Systems Power and Energy
• Journal Name: Composites Part A: Applied Science and Manufacturing
• Publisher: Elsevier
• ISSN: 1359-835X
• ISSN (Online): 1878-5840
• Published Online: 10 June 2017
• Copyright Holders: Copyright © 2017 Elsevier
• First Published: First published in Composites Part A: Applied Science and Manufacturing 101:81-97
• Publisher Policy: Reproduced in accordance with the copyright policy of the publisher