Equidensometry applied to photoelasticity

Mehrotra, C.; Meyer, M. L.

doi:10.1007/bf02320695

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…The film then shows pure isochromatic fringes of integral orders. The authors have combined this technique with photographic methods of fractional fringe order measurement (1 1)- ( 14).…”

Section: Introductionmentioning

confidence: 99%

Replacement of quarter-wave plates by photographic double exposure for controlled density evaluation

Mehrotra

Meyer

1977

The Journal of Strain Analysis for Engineering Design

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Isoclinics are eliminated by double exposure of a film in the camera of a plane polariscope and by rotation of the coupled polaroids through 45" between the two exposures of equal duration. The resultant photographic isochromatic pattern can be evaluated by interpreting and calibrating as lines of constant fractional fringe orders the sharp boundaries between dark and bright regions seen in a developed high-contrast film negative or the narrow equidensity lines obtained in a developed Agfacontour film negative. Alternatively a developed low-contrast film negative may be copied by contact or enlargement on high-contrast or Agfacontour film.The fractional fringe orders of the lines on any photograph depend on the exposure time, or copyingexposure time, and on the coupling angle of the polaroids. Monochromatic light, or white light with blue-sensitive or orthochromatic film, may be used. An evaluated example and error analyses show that discrimination of fractional orders is about the same as in conventional compensation methods.

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“…The film then shows pure isochromatic fringes of integral orders. The authors have combined this technique with photographic methods of fractional fringe order measurement (1 1)- ( 14).…”

Section: Introductionmentioning

confidence: 99%

Replacement of quarter-wave plates by photographic double exposure for controlled density evaluation

Mehrotra

Meyer

1977

The Journal of Strain Analysis for Engineering Design

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Determination of strains in photoelastic coatings

Durelli

Rajaiah

1980

Experimental Mechanics

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Means of apply ing known displacements and known stresses to the boundaries of models used in exper imental stress analysis are g iven. The application of som e of these methods to the analysis of stresses in the field of solid propellant grains is illustrated. The presence of the "pinching effec t" is discussed. 5. A. J. Durelli, "Brief Review of the State of the Art and Expected Advance in Experimental Stress and Strain Analysis of Solid Propellant Grains"-April l96~&. A brief review is made of the state of the experimental stress and strain analysis of solid propellant grains. A discussion of the prospects for the nex t fi f t e e n years is added. 6. A. J. Durelli , "Experimental Strain and Stress Analysis of Solid Propellant Rocket Motors "-MarCh 1965. A review is made of the experimental methods used to strain-a nalyze solid propellant rocket motor shells and grains when subjected to different loading conditions. Methods directed at the determination of strains in actual rockets are included. 7. L. Ferrer , V. J. Parks and A. J. Durelli , "An Experimental Method to Analyze Gravitational Stresses in Two-Dimensional Problems"-Oc tOber 1965. Photoelasticity and mofr~ methods are used to solve two-dimensional problems in which gravity-stresses are present .

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Error assessment using equidensity fringes in photoelasticity

Freidrich

1979

Experimental Mechanics

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Equidensometry applied to photoelasticity

Cited by 7 publications

References 8 publications

Replacement of quarter-wave plates by photographic double exposure for controlled density evaluation

Replacement of quarter-wave plates by photographic double exposure for controlled density evaluation

Determination of strains in photoelastic coatings

Error assessment using equidensity fringes in photoelasticity

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