Digital Photoelasticity: Advanced Techniques and Applications

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Digital Photoelasticity: Advanced Techniques and Applications

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Digital Photoelasticity: Advanced Techniques and Applications

K. Ramesh¹, G Lewis²•Institutions (2)

Indian Institute of Technology Kanpur¹, University of Memphis²

01 Jan 2000-

TL;DR: In this article, phase shifting, Polarization Stepping and Fourier Transform Methods are used for phase unwrapping and Optically Enhanced Tiling in digital photoelasticity.

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Abstract: Transmission Photoelasticity.- Reflection Photoelasticity.- Digital Image Processing.- Fringe Multiplication.- Fringe Thinning and Fringe Clustering.- Phase Shifting, Polarization Stepping and Fourier Transform Methods.- Phase Unwrapping and Optically Enhanced Tiling in Digital Photoelasticity.- Colour Image Processing Techniques.- Evaluation of Contact Stress Parameters and Fracture Parameters.- Stress Separation Techniques.- Fusion of Digital Photoelasticity, Rapid Prototyping and Rapid Tooling Technologies.- Recent Developments and Future Trends.

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Journal Article•DOI•

Data acquisition techniques in photoelasticity

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M. Solaguren-Beascoa Fernández¹•Institutions (1)

University of Burgos¹

01 Nov 2011-Experimental Techniques

16 citations

Journal Article•DOI•

Digital reflection photoelasticity using conventional reflection polariscope

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T. Kasimayan¹, K. Ramesh¹•Institutions (1)

Indian Institute of Technology Madras¹

01 Sep 2010-Experimental Techniques

15 citations

Dissertation•

Near Infrared Photoelasticity of Polycrystalline Silicon and it's Relation to In-Plane Residual Stresses

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Shijiang He

08 Aug 2005

15 citations

Cites background or methods from "Digital Photoelasticity: Advanced T..."

...Traditional photoelasticity extracts the photoelastic parameters using fringe counting methods [24], which identify integral fringes by locating the center of the photoelastic fringes....
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...The relationship between the principal refractive indices and the principal stresses are expressed as the stress-optic law [24] n1 − n2 = C(σ1 − σ2) (31a) n2 − n3 = C(σ2 − σ3) (31b) n3 − n1 = C(σ3 − σ1) (31c) The equations are for light propagation in the directions of principal stresses σ1, σ2 and σ3, respectively; C is known as the relative stress-optic coefficient....
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...The stress-optic law is [24], δ = 2πt λ C(σ1 − σ2) (32)...
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Journal Article•DOI•

Shear Wave Measurements of a Gelatin's Young's Modulus

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Stephen Pansino¹, Benoit Taisne¹•Institutions (1)

Nanyang Technological University¹

29 May 2020-Frontiers in Earth Science

TL;DR: In this paper, a method to measure the Young's modulus of a gelatin, using shear waves, has been proposed, which can make precise, time-efficient estimates of the material strength and additionally is non-destructive and can be performed in situ.

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Abstract: We present a technique to measure the Young’s modulus of a gelatin, using shear waves. Gelatin is a commonly used material for analogue experiments in geophysics, investigating fluid-filled fractures like magmatic dikes, as well as fault slip. Using polarized filters, the deviatoric stresses in a block of gelatin become visible, as do the stress perturbation induced by waves propagating through the medium. We demonstrate how the wave velocity can be measured and related to the Young’s modulus, as well as processing techniques that improve the measurement precision. This methodology is simple to implement into a laboratory setting, can make precise, time-efficient estimates of the material strength and additionally is non-destructive and can be performed in situ.

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14 citations

Cites background from "Digital Photoelasticity: Advanced T..."

...However, if there is a deviatoric stress field, the light’s velocity retards heterogeneously, depending on the wavelength and stress level (Ramesh, 2000)....
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Journal Article•DOI•

Finite element simulation of isoclinic and isochromatic phasemaps for use in digital photoelasticity

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K. Ashokan¹, K. Ramesh¹•Institutions (1)

Indian Institute of Technology Madras¹

01 Jan 2009-Experimental Techniques

14 citations