On the Calibration of Optical Full-Field Strain Measurement Systems

Abstract:

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There are no standard reference materials suitable for the calibration of full-field optical strain measurement systems. This is hindering the uptake of the technology by industrial end-users since optical metrology instrumentation and procedures cannot be easily integrated into quality assurance systems. The EU-funded SPOTS project is developing a physical reference material (PRM) and measurement protocol that should provide the basis of a calibration standard for establishing the traceability of strain values obtained with optical devices. This paper describes a PRM based on a parametric design of monolithic four-point bend test that can reliably generate a known strain field over a range of specimen sizes. Measurements acquired from strain gauges and LVDTs compared well with data obtained from ESPI, digital image correlation, photoelasticity and thermoelasticity studies, demonstrating excellent repeatability and inter-laboratory reproducibility.

Info:

Periodical:

Edited by:

J.M. Dulieu-Barton and S. Quinn

Pages:

397-402

DOI:

10.4028/www.scientific.net/AMM.3-4.397

Citation:

M. P. Whelan et al., "On the Calibration of Optical Full-Field Strain Measurement Systems", Applied Mechanics and Materials, Vols. 3-4, pp. 397-402, 2005

Online since:

August 2006

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$35.00

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