Title: On the Calibration of Optical Full-Field Strain Measurement Systems
Citation: Applied Mechanics and Materials - Advances in Experimental Mechanics IV vol. 3-4 p. 397-402
Publisher: Trans Tech Publications Inc.
Publication Year: 2005
JRC N°: JRC32529
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC32529
Type: Articles in periodicals and books
Abstract: 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.
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