Download/Embed scientific diagram | Circular polariscope setup. from publication: Digital image analysis around isotropic points for photoelastic pattern . generated experimentally by a circular polariscope and the phase distribution is The polariscope is an optical system [13, 14] that utilizes. Experimental Stress Analysis Department of Mechanical Engineering Page 10 2) Circular polariscopes It employs circularly polarized light.

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By using this site, you agree to the Terms of Use and Privacy Policy. Thus they are the lines which join the points with equal maximum shear stress magnitude. The basic advantage of a circular polariscope over a plane polariscope is that in a circular polariscope setup we only get the isochromatics and not the isoclinics.

File:Transmission Circular Polariscope.svg

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For isotropic materials, this definition simplifies to [16].

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For materials that do not show photoelastic behavior, it is still possible to study the stress distribution. The light is then made to pass through the analyzer and we finally get the fringe pattern.

The first quarter-wave plate is placed in between the polarizer and the specimen and the second quarter-wave plate is placed between the specimen and the analyzer.

From either definition, it is clear that deformations to the body may induce optical anisotropy, which can cause an otherwise optically isotropic material to exhibit birefringence. The working principle of a two-dimensional experiment allows the measurement of retardation, which can be converted to the difference between the first and second principal stress and their orientation.

Views Read Edit View history. Assuming a thin specimen made of isotropic materials, where two-dimensional photoelasticity is applicable, the magnitude of the relative retardation is given by the stress-optic law: This led to the development of dynamic photoelasticity, which has contributed greatly to the study of complex phenomena such as fracture of materials.

Between andmany other books appeared on the po,ariscope, including books in RussianGerman and French.

Photoelasticity – Wikipedia

At the same time, much development occurred in the field — great improvements were achieved in technique, and the equipment was simplified. First the light is passed through the first polarizer which converts the light into plane polarized light. Dal Corso and D. This eliminates the problem of differentiating between the isoclinics and the isochromatics.

Brewster, Experiments on the depolarization of light as exhibited by various mineral, animal and vegetable bodies with a reference of the phenomena to the general principle of polarization, Phil. Part II — Modelling.

Isoclinics are the loci of the points in the specimen along which the principal stresses are in the same direction. So the present section deals with photoelasticity in a plane stress system.

This page was last edited on 20 Decemberat The experimental setup varies from experiment to experiment. Photoelasticity has been used for a variety of stress analyses and even for routine use in design, polafiscope before the advent of numerical methods, such as for instance finite elements or boundary elements.


Photoelastic experiments also informally referred to as photoelasticity are an important tool for determining critical stress points in a material, and are used for determining stress concentration in irregular geometries.

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File:Transmission Circular – Wikimedia Commons

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With refinements in the technology, photoelastic experiments were extended to determining three-dimensional states of stress. The effect of adding the quarter-wave plate after the source-side polarizer is that we get circularly polarized light passing through the sample.

It is a property of all dielectric media and is often used to experimentally determine the stress distribution in a material, where it gives a picture of stress distributions around discontinuities in materials.


Circulsr studying the fringe pattern one can determine the state of stress at various points in the material. Due to optical interference of the two waves, a fringe pattern is revealed. With the advent of the digital polariscope — made possible by light-emitting diodes — continuous monitoring of structures under load became possible.