Title
Full-field optical deformation measurement in biomechanics : digital speckle pattern interferometry and 3D digital image correlation applied to bird beaks Full-field optical deformation measurement in biomechanics : digital speckle pattern interferometry and 3D digital image correlation applied to bird beaks
Author
Faculty/Department
Faculty of Sciences. Physics
Publication type
article
Publication
,
Subject
Physics
Biology
Source (journal)
Journal of the mechanical behavior of biomedical materials. - Place of publication unknown
Volume/pages
14(2012) , p. 186-191
ISSN
1751-6161
ISI
000313761700020
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Affiliation
University of Antwerp
Abstract
In this paper two easy-to-use optical setups for the validation of biomechanical finite element (FE) models are presented. First, we show an easy-to-build Michelson digital speckle pattern interferometer (DSPI) setup, yielding the out-of-plane displacement. We also introduce three-dimensional digital image correlation (3D-DIC), a stereo photogrammetric technique. Both techniques are non-contact and full field, but they differ in nature and have different magnitudes of sensitivity. In this paper we successfully apply both techniques to validate a multi-layered FE model of a small bird beak, a strong but very light biological composite. DSPI can measure very small deformations, with potentially high signal-to-noise ratios. Its high sensitivity, however, results in high stability requirements and makes it hard to use it outside an optical laboratory and on living samples. In addition, large loads have to be divided into small incremental load steps to avoid phase unwrapping errors and speckle de-correlation. 3D-DIC needs much larger displacements, but automatically yields the strains. It is more flexible, does not have stability requirements, and can easily be used as an optical strain gauge.
E-info
https://repository.uantwerpen.be/docman/iruaauth/c1b606/36dc042dc35.pdf
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