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

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

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 thro...

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Bibliographic Details
Published in:Strain Vol. 55; no. 2
Main Authors: Alsayednoor, Jafar, Harrison, Philip, Dobbie, Maggie, Costantini, Rosa, Lennard, Frances
Format: Journal Article
Language:English
Published: Chichester Wiley Subscription Services, Inc 01-04-2019
Subjects:
Correlation analysis
Deformation
Deformation analysis
digital image correlation
Digital imaging
Error analysis
Finite element method
finite element modelling
full‐field monitoring
Linearity
Mapping
Optimization
Reliability analysis
Stitching
Strain measurement
tapestry
textile conservation
Tracking
Viability
Weight
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Summary: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.
ISSN:0039-2103
1475-1305
DOI:10.1111/str.12308