Quantifying Bulk Plasticity and Predicting Transition Velocities for Armor Ceramics Using Hardness Indentation Tests
Final rept. Oct 2008-Sep 2011
ARMY RESEARCH LAB ABERDEEN PROVING GROUND MD
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Many studies have shown that harder ceramics generally perform better in armor applications however, the nature of the relationship between hardness and ballistic performance is not understood to a degree that is useful in materials development. In addition, some research has suggested that a materials 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. Recently, an empirical approach has been described in which hardness tests are used to quantify bulk plasticity in structural ceramics and predict their transition velocities. The current study extends this approach to a wider variety of potential armor ceramics. For those ceramics that have been tested in dwellpenetration transition experiments, the transition velocities predicted by this approach generally show excellent agreement within 5 in most cases with the experimentally determined velocities. Furthermore, the robustness of the technique is demonstrated through the incorporation of multiple operators and multiple hardness-testing units.
- Ceramics, Refractories and Glass
- Properties of Metals and Alloys