27 September 2016 Uncertainties in strain measurements with birefringence
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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.
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J. G. Suárez-Romero, G. Atanacio-Jiménez, J. E. Estrada-Muñoz, R. Vilchis-Sánchez, S. Aguilar-Gómez, "Uncertainties in strain measurements with birefringence", Proc. SPIE 9953, Optical Modeling and Performance Predictions VIII, 99530S (27 September 2016); doi: 10.1117/12.2238359; https://doi.org/10.1117/12.2238359
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