A reference material for establishing uncertainties in full-field displacement measurements

Hack, E, Lin, X, Patterson, E and Sebastian, C 2015, 'A reference material for establishing uncertainties in full-field displacement measurements', Measurement Science and Technology, vol. 26, no. 7, 075004, pp. 1-13.


Document type: Journal Article
Collection: Journal Articles

Title A reference material for establishing uncertainties in full-field displacement measurements
Author(s) Hack, E
Lin, X
Patterson, E
Sebastian, C
Year 2015
Journal name Measurement Science and Technology
Volume number 26
Issue number 7
Article Number 075004
Start page 1
End page 13
Total pages 13
Publisher Institute of Physics Publishing
Abstract A simple reference material for establishing the minimum measurement uncertainty of optical systems for measuring 3D surface displacement fields in deforming objects is described and its use demonstrated by employing 3D digital image correlation as an exemplar technique. The reference material consists of a stepped bar, whose dimensions can be scaled to suit the application, and that can be clamped rigidly at its thick end to create an idealized cantilever. The cantilever was excited at resonance to generate out-of-plane displacements and, in a separate experiment, loaded statically in-plane to provide in-plane displacement fields. The displacements were measured using 3D digital image correlation and compared to the predicted displacement fields derived from tip deflections obtained using a calibrated transducer that provided traceability to the national standard for length. The minimum measurement uncertainties were evaluated by comparing the measured and predicted displacement fields, taking account of the uncertainties in the input parameters for the predictions. It was found that the minimum measurement uncertainties were less than 3% for the Cartesian components of displacement present during static in-plane bending and less than 3 m for out-of-plane displacements during dynamic loading. It was concluded that this reference material was more straightforward to use, more versatile and yielded comparable results relative to an earlier design.
Subject Mechanical Engineering not elsewhere classified
Keyword(s) reference material
measurement uncertainty
calibration
digital image correlation
DOI - identifier 10.1088/0957-0233/26/7/075004
Copyright notice © 2015 IOP Publishing Ltd.
ISSN 0957-0233
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