2026-05-29T21:00:36Zhttps://riubu.ubu.es/oai/request

oai:riubu.ubu.es:10259/92592024-06-15T00:05:25Zcom_10259_4201com_10259_5086com_10259_2604col_10259_4505

00925njm 22002777a 4500 dc Solaguren-Beascoa Fernández, Manuel author 2023-05-01 In this study, a method for evaluating the uncertainty of stress-optic coefficient measurements of photoelastic materials on a uniaxial tension/compression specimen is presented. The same problem is also approached in other previously used methods, in which multiple data fitted with ordinary least squares are considered. However, only the repeatability contribution to uncertainty is considered in those other methods, which are therefore not consistent with the ISO–Guide to the expression of Uncertainty in Measurement. All possible contributions to uncertainty can be taken into account using the General Least Squares-Lagrange Multipliers (GLS-LM) method presented here. The application of the method is illustrated with an example, from which it can be seen that uncertainty has been underestimated in the other methods used to date. As well as the estimate of the stress-optic coefficient and its corresponding standard uncertainty, the method also provides a data consistency test and an outlier identification tool. 0022-3093 http://hdl.handle.net/10259/9259 10.1016/j.jnoncrysol.2023.122249 Stress-optic coefficient Photoelasticity Uncertainty Measurement Metrology Evaluation of uncertainty in the measurement of the stress-optic coefficient