A Review of Strain Measurement Techniques Using the Grid Method

    Published: Jan 1997

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    The grid method is the oldest and simplest method for strain measurement. It is an experimental technique in which a grid is applied to the surface of a specimen. A grid is defined as one or more lines, dots or other shapes assembled in regular or irregular patterns. A comparison of the deformed grid on the specimen, undergoing a general state of loading, to that of a reference state yields the state of deformation. The emphasis in this paper is on reviewing experimental techniques emphasizing optical, non-contact, non-interfering and automated means of making deformation measurements using the grid method. Thus, the objectives of this paper are: to briefly review the basic principles and applications of the grid method in transparent and opaque solids, to describe the state-of-the-art, and, to point in the direction of its future evolution.


    grid method, diffraction pattern, elastic deformation, plastic deformation, full-field strain measurement, optical diffraction gratings, optical measuring instruments, strain tensor, video imaging, image processing

    Author Information:

    Cárdenas-García, JF
    Associate and Assistant Professor, Texas Tech University, Lubbock, TX

    Wu, MM
    Senior Engineer, Bechtel Corporation, Houston, TX

    Hashemi, J
    Associate and Assistant Professor, Texas Tech University, Lubbock, TX

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP11897S

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