Photonic Doppler Velocimetry for Study of Rapid Penetration into Sand

    Volume 37, Issue 1 (January 2014)

    ISSN: 0149-6115

    CODEN: GTJOAD

    Published Online: 30 October 2013

    Page Count: 13


    Peden, Robert
    Institute of Advanced Technology, Univ., of Texas at Austin, Austin, TX

    Omidvar, Mehdi
    Polytechnic Institute of New York Univ., Brooklyn, NY

    Bless, Stephan
    Polytechnic Institute of New York Univ., Brooklyn, NY

    Iskander, Magued
    Polytechnic Institute of New York Univ., Brooklyn, NY

    (Received 1 March 2013; accepted 19 August 2013)

    Abstract

    Quantitative description of the interaction of high-speed projectiles with soils is important for many engineering applications, and provides insights into high strain rate constitutive behavior. In this paper, a novel method known as photonic Doppler velocimetry (PDV), capable of producing time resolved velocity measurements, is adapted for the study of objects penetrating rapidly into sand. Fundamentals of PDV are described, and the applicability of the method is demonstrated by producing time-resolved velocity measurements of spherical projectiles penetrating Ottawa sand models at high velocities in the range of 300 m/s. Penetration tests demonstrate that PDV is capable of producing velocity measurements even after the penetrator has reached a depth well below the soil surface. Results of the tests confirmed that resistance to penetration increases as relative density of the sand deposit increases. Moreover, there appears to be a threshold penetration velocity in dense dry sand, below which resistance to penetration reduces considerably. A quantitative description of deceleration of penetrators in soils can be adequately provided for most of the penetration using a simple drag force model.


    Paper ID: GTJ20130037

    DOI: 10.1520/GTJ20130037

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    Author
    Title Photonic Doppler Velocimetry for Study of Rapid Penetration into Sand
    Symposium , 0000-00-00
    Committee D18