Volume 41, Issue 2 (March 2013)

    Improved Digital Image Correlation Method for Eliminating Pixel Shape-Induced Errors in Shear-Strain Calculations

    (Received 23 March 2012; accepted 28 August 2012)

    Published Online: 2013

    CODEN: JTEOAD

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    Abstract

    Digital image correlation is widely used in non-contact displacement/strain measurements for numerous engineering applications. Under rigid body rotation or shear deformation, however, the calculated surface strain of specimens is unreliable when camera pixels are characterized by non-square geometry, that is, the width-to-height ratio of pixels is not 1. This study analyzes the computational errors introduced by cameras, and proposes a modified least-squares method that eliminates such errors when the strain field is calculated. Experimental results confirm that the algorithm validly and effectively computes shear strain.


    Author Information:

    Peng, Bei
    Univ. of Electronic Science and Technology of China, Dept. of Mechanical Engineering, Chengdu,

    Huang, Chengcheng
    Univ. of Electronic Science and Technology of China, Dept. of Mechanical Engineering, Chengdu,

    Zhou, Wu
    Univ. of Electronic Science and Technology of China, Dept. of Mechanical Engineering, Chengdu,

    Yu, Huijun
    Univ. of Electronic Science and Technology of China, Dept. of Mechanical Engineering, Chengdu,

    Zeng, Zhi
    Univ. of Electronic Science and Technology of China, Dept. of Mechanical Engineering, Chengdu,


    Stock #: JTE20120085

    ISSN: 0090-3973

    DOI: 10.1520/JTE20120085

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    Author
    Title Improved Digital Image Correlation Method for Eliminating Pixel Shape-Induced Errors in Shear-Strain Calculations
    Symposium , 0000-00-00
    Committee C14