Digital Photoelasticity: Advanced Techniques and Applications

Ramesh, K.; Lewis, Gladius

doi:10.1115/1.1483353

Cited by 117 publications

(189 citation statements)

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“…The expected phasemap should have increasing fractional fringe order radially inwards but the phasemap obtained from images in the figure had reversed phasemap at some locations and erroneous output elsewhere. This has been also reported in the literature [1]. This was investigated and was found to be due to the ambiguity in determination of isoclinic as it fell in range of 4 /   to 4 /  , thus it could represent either 1  or 2  (principal stresses).…”

Section: Figure 7 Phasemap Using Monochromatic Light (A) Isoclinicsmentioning

confidence: 95%

“…This has been also reported in the literature [1]. This was investigated and was found to be due to the ambiguity in determination of isoclinic as it fell in range of 4 /   to 4 /  , thus it could represent either 1  or 2  (principal stresses). It is important to note that isoclinic would represent only one of the two stresses to determine isochromatics and to produce accurate phasemap.…”

Section: Figure 7 Phasemap Using Monochromatic Light (A) Isoclinicsmentioning

confidence: 95%

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Tactile Whole-Field Imaging Sensor on Photoelasticity

Dubey

Grewal

2007

Volume 4: ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications and the 19th Reliability, STR

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The paper describes a whole-field imaging sensor developed on the principles of photoelasticity. The sensor produces colored fringe patterns when load is applied on the contacting surface. These fringes can be analyzed using conventional photoelastic techniques, however, as the loading in the present case is not conventional some new strategies need to be devised to analyze the load imprint. The loading is unconventional in the sense that low modulus photoelastic material is deformed under vertical load in the direction of light travel to induce the photoelastic effect. The paper discusses the efficacy of both RGB calibration and phase shifting techniques in sensing applications. The characteristics of fringe patterns obtained under vertical and shear loads have been studied and the results obtained under these conditions are discussed with their limitations specifically when this is applied for sensing applications. Finally a case study has been conducted to analyze a foot image and conclusions drawn from this have been presented.

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Section: Figure 7 Phasemap Using Monochromatic Light (A) Isoclinicsmentioning

confidence: 95%

Section: Figure 7 Phasemap Using Monochromatic Light (A) Isoclinicsmentioning

confidence: 95%

Tactile Whole-Field Imaging Sensor on Photoelasticity

Dubey

Grewal

2007

Volume 4: ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications and the 19th Reliability, STR

View full text Add to dashboard Cite

show abstract

“…The expected phasemap should have increasing fractional fringe order radially inwards but the phasemap obtained from images in the figure had reversed phasemap at some locations and erroneous output elsewhere. This has been also reported in the b a literature [1]. This was investigated and was found to be due to the ambiguity in determination of isoclinic as it fell in range of 4 /   to 4 /  , thus it could represent either 1  or 2  (principal stresses).…”

Section: Phase-shifting Under Unconventional Loadmentioning

confidence: 99%

“…This has been also reported in the b a literature [1]. This was investigated and was found to be due to the ambiguity in determination of isoclinic as it fell in range of 4 /   to 4 /  , thus it could represent either 1  or 2  (principal stresses). It is important to note that isoclinic would represent only one of the two stresses to determine isochromatics and to produce the accurate phasemap.…”

Section: Phase-shifting Under Unconventional Loadmentioning

confidence: 99%

“…This produces colored fringes in the material under white light, which can be visualized through suitable optical filters. This characteristic is based on the phenomenon possessed by certain non-crystalline materials that are ideally isotropic but behave anisotropically when loaded [1]. The effect is temporary and persists only until specimen is loaded.…”

Section: Introductionmentioning

confidence: 99%

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Photoelastic Stress Analysis Under Unconventional Loading

Dubey

Grewal

2007

Volume 4: ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications and the 19th Reliability, STR

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This paper presents use of conventional photoelastic techniques under unconventional loading situations to evaluate their efficacy in sensing applications. The loading is unconventional in the sense that low modulus photoelastic material is deformed under vertical load in the direction of light travel to induce the photoelastic effect. This is atypical of conventional methods where loading is across the light travel. Both RGB calibration and phase shifting techniques have been used to study the characteristics of fringe patterns obtained under vertical and shear loads. The results obtained under these conditions are discussed with their limitations specially when this is applied for sensing applications. Finally a case study has been conducted to analyze the foot image and conclusions drawn from this have been presented.

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Fractographic characterization of isotactic polypropylene fibers

Sokkar

El‐Bakary

Azzam

et al. 2020

Microscopy Res & Technique

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In this article we present an opto‐thermo‐mechanical characterization of isotactic polypropylene monofilament during failure by fracture. The digital photoelasticity, the two‐beam Pluta polarising interference microscope and the computed tomography are used to provide quantitative data and visual models of the fracture regions of isotactic polypropylene fibers suffering failure by fracture at different thermal and mechanical conditions. Birefringence values and the intrinsic stress‐anisotropy are measured at the fracture surface. 3D models of the fracture regions are reconstructed. Photoelastic patterns and two‐beam interferograms are included for illustration.

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Digital Photoelasticity: Advanced Techniques and Applications

Abstract: This book provides a welcome and very useful overview of the technologies which have breathed new life into a very long-established experimental stress analysis technique.

Cited by 117 publications

References 0 publications

Tactile Whole-Field Imaging Sensor on Photoelasticity

Tactile Whole-Field Imaging Sensor on Photoelasticity

Photoelastic Stress Analysis Under Unconventional Loading

Fractographic characterization of isotactic polypropylene fibers

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