Journal ArticleDOI
Full-field stress determination in photoelasticity with phase shifting technique
TLDR
In this paper, a method to determine the stress distribution by means of phase shifting and a modified shear-difference is proposed, which is an effective method for evaluating the stress and its spatial variations within a stressed body.Abstract:
Photoelasticity is an effective method for evaluating the stress and its spatial variations within a stressed body. In the present study, a method to determine the stress distribution by means of phase shifting and a modified shear-difference is proposed. First, the orientation of the first principal stress and the retardation between the principal stresses are determined in the full-field through phase shifting. Then, through bicubic interpolation and derivation of a modified shear-difference method, the internal stress is calculated from the point with a free boundary along its normal direction. A method to reduce integration error in the shear difference scheme is proposed and compared to the existing methods; the integration error is reduced when using theoretical photoelastic parameters to calculate the stress component with the same points. Results show that when the value of Δx/Δy approaches one, the error is minimum, and although the interpolation error is inevitable, it has limited influence on the accuracy of the result. Finally, examples are presented for determining the stresses in a circular plate and ring subjected to diametric loading. Results show that the proposed approach provides a complete solution for determining the full-field stresses in photoelastic models.read more
Citations
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Digital full-field photoelasticity of tempered architectural glass: A review
TL;DR: In this paper , a general overview of the different full-field methods for measuring retardation in tempered glass and their current state of development and usage is presented, and a comparison based on recent literature is presented.
Journal ArticleDOI
Residual stress measurement methods of optics
Xiao Shilei,Li Bincheng +1 more
TL;DR: In this article, the authors summarized the principles, measurement precisions and application scenarios of these residual stress measurement methods are summarized in this overview, and correlations between them are analyzed in detail.
Journal ArticleDOI
High-precision stress determination in photoelasticity
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Extracting fracture mechanics parameters (higher-order coefficients of Williams series expansion) from FEM analysis and digital photoelasticity method
Journal ArticleDOI
Full-Field Phase Shifting and Stress Quantification Using a Polarization Camera
TL;DR: In this article , a simple operation method achieving phase shifting for accurately determining photoelastic parameters has been proposed, and a stress separation strategy for full-field stress calculation has also been developed.
References
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TL;DR: In this article, a robust method for 2D phase principal values (in a least-squares sense) by using fast cosine transforms was developed, which can be used to isolate inconsistent regions (i.e., phase shear).
Journal ArticleDOI
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Eann A. Patterson,Z F Wang +1 more
TL;DR: The design of a automated system for photoelastic analysis of complex components and the potential of the system for providing detailed data over the full field of view is demonstrated by the analysis of a slice from a model of a bolt.
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TL;DR: In this article, the Poincare Sphere and the Jones Calculus are used to describe the photoelastic properties of polarized light, including three-dimensional, two-dimensional and scattered-light photoelsasticity.
Journal ArticleDOI
Digital photoelasticity: Principles, practice and potential
TL;DR: An overview of the principal techniques of digital fringe processing is provided within a single theoretical framework in this paper, where experiments involving more I x 10 6 quantitative fringe order measurements are possible and practical on a routine basis using the current technology.
Journal ArticleDOI
Whole field evaluation of stress components in digital photoelasticity—Issues, implementation and application
TL;DR: In this paper, a quality guided approach for isoclinic unwrapping is developed, which uses a ten-step phase shifting approach to obtain a smooth variation of the digital photoelastic parameters over the domain.