Download PDF by L. Franks: Advances in Ceramic Armor III: Ceramic Engineering and

Download PDF by L. Franks: Advances in Ceramic Armor III: Ceramic Engineering and

By L. Franks

Papers from the yank Ceramic Society's thirty first overseas convention on complex Ceramics and Composites, held in Daytona seashore, Florida, January 21-26, 2007. themes comprise obvious ceramics for impression resistance, safety opposed to mine blast and fragments, demanding situations dealing with ceramic armor brands, novel fabric options and improvement of legitimate armor layout and characterization instruments to foretell functionality for air and flooring cars in addition to the person soldier.

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Extra info for Advances in Ceramic Armor III: Ceramic Engineering and Science Proceedings

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Z Comparison of static and dynamic indentation hardness The results of static and dynaniic hardness nieasurements for the three grain sizes are presented in Fig. 6. Both static and dynamic hardness values showed a wide scatter for all the grain sizes. In the tested load range. O GPa. In general. compared to static hardness. a Ion-er dynaniic hardness was observed for all the three grain sizes. O GPa) grain size specimens. 34 Advances in Ceramic Armor Ill Static and Dynamic Indentation Response of Fine Grained Boron Carbide Fig.

In this case, the projectile penetrates in a rigid-body manner. The PS-5000 behaviour can be explained by the stress-wave propagation in the ceramic that expands in a hemi-spherical fashion until it interacts with boundaries. During the ballistic impact a compressive stress wave is delivered to both the ceramic and the projectile. This wave consists of a fast-moving elastic portion and a slower-moving inelastic portion that disperses with distance. The first interface that is encountered by the wave is at the ceramic / polycarbonate interface.

Two silicon carbides of varying sizes were tested: a direct sintered silicon carbide (Morgan AM&T PS-5000) and a commercially available liquid phase sintered (LPS) silicon carbide. Their measured properties are presented in Table I along with the properties of polycarbonate taken from [7]. The elastic properties of the silicon carbides were very similar. The densities were measured using a gas pycnometer and the longitudinal wave velocities, Young's modulus values and Poisson's ratios were measured ultrasonically using Panametrics' 5MHz longitudinal and shear-wave probes.

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