Using Hardness Tests to Quantify Bulk Plasticity and Predict Transition Velocities in SiC Materials

Authors

  • Corydon D. Hilton,

    Corresponding author
    • U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
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    • Work performed while a postdoctoral engineer supported by an appointment to the Postgraduate Research Participation Program at the U.S. Army Research Laboratory administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and USARL.
  • James W. McCauley,

    1. U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
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  • Jeffrey J. Swab,

    1. U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
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  • Eugene R. Shanholtz,

    1. U.S. Army Research Laboratory, Aberdeen Proving Ground, MD 21005, USA
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    • Work performed while an undergraduate student at Towson University supported by an appointment to the Internship Research Participation Program at the U.S. Army Research Laboratory administered by the Oak Ridge Institute for Science and Education through an interagency agreement between the U.S. Department of Energy and USARL.
  • Ming W. Chen

    1. WPI Advanced Institute for Materials Research, Tohoku University, Sendai, Japan
    2. CREST, JST, Saitama, Japan
    3. State Key Laboratory of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
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corydon.d.hilton.ctr@mail.mil

Abstract

It has long been known that a relation exists between a material's hardness and its gross impact performance; however, the nature of this relationship has not been understood to a degree useful in materials development. Many studies have shown that harder ceramics tend to display better ballistic performance. In addition, some research has suggested that a material's potential for inelastic deformation (or its “quasi-plasticity” – a bulk property) may also play an important role in its resistance to penetration. Methods of quantifying the bulk plasticity of a ceramic material are, however, extremely limited. The current study continues an investigation into a recently proposed technique to (1) quantify bulk quasi-plasticity in SiC materials, and (2) use the “plasticity” value along with a hardness value to predict the transition velocity of potential armor ceramics. The transition velocity values predicted by this approach generally show excellent agreement (within 5% in most cases) with experimentally determined velocities. In addition, the robustness of this predictive technique is demonstrated through the use of multiple operators and multiple hardness testing units.

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