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Proceedings Paper

Uncertainties in strain measurements with birefringence
Author(s): J. G. Suárez-Romero; G. Atanacio-Jiménez; J. E. Estrada-Muñoz; R. Vilchis-Sánchez; S. Aguilar-Gómez
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Paper Abstract

Photoelasticity is a stress measurement method extensively used in test laboratories of materials. This method can be a reference to validate numerical calculation of stress and strain distributions, however we need to evaluate errors and uncertainties to know the reproducibility of the method in order to compare with numerical calculation. Some transparent materials present birefringence when they are stressed. In a first approximation the birefringence depends of the stress in a linear way, the proportionality constant is known as stress-optic constant. When polychromatic light is used the wavelength becomes other important parameter for the method. Therefore the stress-optic constant is a source of error and uncertainty, also the resolution of the wavelength is a second source of error and uncertainty. In this work we present an evaluation of the sources of errors and uncertainties of the photoelasticity method for stress and strain measurements.

Paper Details

Date Published: 27 September 2016
PDF: 8 pages
Proc. SPIE 9953, Optical Modeling and Performance Predictions VIII, 99530S (27 September 2016); doi: 10.1117/12.2238359
Show Author Affiliations
J. G. Suárez-Romero, Instituto Tecnológico de Querétaro (Mexico)
G. Atanacio-Jiménez, Instituto Tecnológico de Querétaro (Mexico)
J. E. Estrada-Muñoz, Instituto Tecnológico de Querétaro (Mexico)
R. Vilchis-Sánchez, Instituto Tecnológico de Querétaro (Mexico)
S. Aguilar-Gómez, Ctr. de Ingeniería y Tecnología S.C. (Mexico)

Published in SPIE Proceedings Vol. 9953:
Optical Modeling and Performance Predictions VIII
Mark A. Kahan; Marie B. Levine-West, Editor(s)

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