Volume 37, Issue 5 (September 2014)

    Detection and Quantification of Slip Along Non-Uniform Frictional Discontinuities Using Digital Image Correlation

    (Received 22 August 2013; accepted 14 May 2014)

    Published Online: 2014

    CODEN: GTJOAD

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    Abstract

    A deformation measurement system based on the principles of digital image correlation (DIC) has been developed to evaluate the process of slip along frictional discontinuities. A biaxial compression apparatus is used to impose shear failure on perfectly mated gypsum specimens with nonhomogeneous contact surfaces. The contact surfaces are made by casting gypsum against flat surfaces with different frictional characteristics and consisted of a smooth surface with low frictional strength on the upper half and a rough surface with high frictional strength on the lower half. Design, implementation, and verification of the DIC measurement system are presented in this paper. DIC successfully identified slip as a jump in the displacement field across the discontinuity. Slip is observed to initiate from the smooth surface with minimum frictional resistance and as the shear load is increased, propagates to the rough surface that has higher frictional resistance. DIC clearly exhibits a reduction in fracture’s shear stiffness based on an increase in the rate of relative vertical displacement across the discontinuity, which initiates from the smooth surface and propagates to the rough surface.


    Author Information:

    Hedayat, Ahmadreza
    Department of Engineering, Indiana Univ.–Purdue Univ., Fort Wayne, IN

    Pyrak-Nolte, Laura J.
    School of Civil Engineering, Purdue Univ., West Lafayette, IN

    Department of Physics, Purdue Univ., West Lafayette, IN

    Department of Earth, Atmospheric and Planetary Sciences, Purdue Univ., West Lafayette, IN

    Bobet, Antonio
    School of Civil Engineering, Purdue Univ., West Lafayette, IN


    Stock #: GTJ20130141

    ISSN: 0149-6115

    DOI: 10.1520/GTJ20130141

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    Author
    Title Detection and Quantification of Slip Along Non-Uniform Frictional Discontinuities Using Digital Image Correlation
    Symposium , 0000-00-00
    Committee D18