Evaluating the use of digital image correlation for strain measurement in historic tapestries using representative deformation fields

Alsayednoor, J., Harrison, P., Dobbie, M., Costantini, R. and Lennard, F. (2019) Evaluating the use of digital image correlation for strain measurement in historic tapestries using representative deformation fields. Strain, 55(2), e12308. (doi:10.1111/str.12308)

[img] Text
176178.pdf - Accepted Version
Restricted to Repository staff only until 11 February 2020.

15MB

Abstract

An analysis technique to assess the viability of digital image correlation (DIC) in tracking the full‐field strains across the surface of hanging historic tapestries is presented. Measurement uncertainty related to the use of the inherent tapestry image in tracking displacements is investigated through use of “synthetic” deformation fields. The latter are generated by mapping the details of a given tapestry image into finite element analyses. The combination of self‐weight loading, material non‐linearity, and image specific heterogeneity (related to slit stitching, damage, and patch‐restorations) serve to generate a bespoke deformation field complex enough to assess the reliability of DIC measurements. Accuracy is evaluated by comparing measured results with the original known deformations. The technique demonstrates that the optimum imaging settings and the choice of subset size for DIC analysis are strongly influenced by the tapestry image and the goal of the measurement, they are found using a compromise between conflicting objectives: minimising measurement error while maximising resolution.

Item Type:Articles
Additional Information:The authors wish to thank the Leverhulme Trust for the grant ‘From the Golden Age to the Digital Age: Modelling and Monitoring Historic Tapestries’, (Ref: RPG-2015-179).
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Lennard, Professor Frances and Harrison, Dr Philip and Alsayednoor, Dr Jafar and Costantini, Rosa
Authors: Alsayednoor, J., Harrison, P., Dobbie, M., Costantini, R., and Lennard, F.
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:Strain
Publisher:Wiley
ISSN:0039-2103
ISSN (Online):1475-1305
Published Online:11 February 2019
Copyright Holders:Copyright © 2019 John Wiley and Sons Ltd
First Published:First published in Strain 55:e12308
Publisher Policy:Reproduced in accordance with the publisher copyright policy

University Staff: Request a correction | Enlighten Editors: Update this record