Measurement of regional equi-inclination and equi-attitude parameters based on chromatic photoelasticity

Guanghai Liu; Ming Gao; Gangcheng Jiao; Feng Shi; Zhaohui Wang; Yuan Yuan; Yan Kong; Chen Zhang; Hong Lv

doi:10.1117/12.3016587

4 March 2024 Measurement of regional equi-inclination and equi-attitude parameters based on chromatic photoelasticity

Guanghai Liu, Ming Gao, Gangcheng Jiao, Feng Shi, Zhaohui Wang, Yuan Yuan, Yan Kong, Chen Zhang, Hong Lv

Proceedings Volume 13070, Speckle 2023: VIII International Conference on Speckle Metrology; 130700Q (2024) https://doi.org/10.1117/12.3016587
Event: Speckle 2023: VIII International Conference on Speckle Metrology, 2023, Xi'an, China

Abstract

In the measurement of equi-inclination and Equi-attitude parameters, the four-step phase-shifting method using white light illumination is used to obtain the principal stress direction angles within the range of [-π/2, π/2], which are consistent with the attributes. This replaces the "inconsistent" isoclinic angles in the six-step phase-shifting method, avoiding the "sawtooth-like" errors in the isoclinic line-wrapped phase map and the "distortions" in the isochromatic line-wrapped phase map. The wrapped phase maps of the isochromatic lines are processed using general unwrapping methods, such as the Goldstein branch-cut method and the quality-guided method, to obtain full-field fractional fringe order. Finally, the separation of stresses is conducted to obtain σx, σy, and τxy for the entire field. A comparison is made between the experimental processing results of a radially compressed circular disk and the theoretical values. The error in the static equilibrium check on the 7.5mm diameter section of the disk, located at a distance of 30mm from the horizontal diameter, is 2.27%, meeting the engineering accuracy requirements.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Guanghai Liu, Ming Gao, Gangcheng Jiao, Feng Shi, Zhaohui Wang, Yuan Yuan, Yan Kong, Chen Zhang, and Hong Lv "Measurement of regional equi-inclination and equi-attitude parameters based on chromatic photoelasticity", Proc. SPIE 13070, Speckle 2023: VIII International Conference on Speckle Metrology, 130700Q (4 March 2024); https://doi.org/10.1117/12.3016587

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KEYWORDS

Phase unwrapping

Phase shifts

Photoelasticity

Algorithm development

Data analysis

Engineering

Polarization

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