STP1318

    A Review of Strain Measurement Techniques Using the Grid Method

    Published: Jan 1997


      Format Pages Price  
    PDF Version (400K) 18 $25   ADD TO CART
    Complete Source PDF (5.8M) 18 $55   ADD TO CART


    Abstract

    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.

    Keywords:

    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


    Paper ID: STP11897S

    Committee/Subcommittee: E08.04

    DOI: 10.1520/STP11897S


    CrossRef ASTM International is a member of CrossRef.