Volume 28, Issue 4 (July 2000)

    A Novel Instrument for Automated Principal Strain Separation in Reflection Photoelasticity

    (Received 28 May 1999; accepted 14 April 2000)

    CODEN: JTEOAD

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    Abstract

    A novel instrument is presented capable of measuring the principal strains at a point on a photoelastic coating. The oblique incidence method of principal strain separation is employed, using three fringe order measurements, which are made by the automated method known as spectral contents analysis. The oblique incidence measurements are made after rotation of the polariscope about any two orthogonal axes. Three polariscopes are built into the instrument, as is a CCD camera, to facilitate accurate positioning of the instrument. The instrument was used to analyze the principal strain distributions in a disk under diametrical compression, a plate with a central hole under tension, and a stepped plate in tension. The strains in the disk and the plate with a hole were compared with theoretical results, and the strains in the stepped plate were compared with a finite element analysis of the problem. The correlation between the experimental and theoretical or numerical strains was better than 0.95 in most cases.


    Author Information:

    Pacey, MN
    Research fellow, University of Plymouth, Plymouth,

    Haake, SJ
    Senior lecturer, University of Sheffield, Sheffield,

    Patterson, EA
    Professor, University of Sheffield, Sheffield,


    Stock #: JTE12099J

    ISSN: 0090-3973

    DOI: 10.1520/JTE12099J

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    Author
    Title A Novel Instrument for Automated Principal Strain Separation in Reflection Photoelasticity
    Symposium , 0000-00-00
    Committee E28