Static and Dynamic Compression Strength of Hot-Pressed Boron Carbide Using a Dumbbell-Shaped Specimen

Report No. ARL-RP-0609
Authors: Jeffrey J Swab, Christopher S Meredith, Daniel T Casem, Robert Gamble
Date/Pages: September 2017; 18 pages
Abstract: Dumbbell-shaped specimens were machined from a tile of a commercially available boron carbide and subjected to static and dynamic compressive loads. Static experiments were performed using a screw-driven load frame, and the fracture process was recorded with a high-speed camera. Dynamic experiments were performed using a split-Hopkinson pressure bar and an ultrahigh-speed camera to record the fracture process. The average static (~10-1 s-1) compressive strength of this boron carbide was determined to be 6.1 ± 0.3 GPa, and the dynamic compression strength, up to a strain rate of 300 s-1, was 6.2 ± 0.3 GPa. These strength values are twice the value reported by the manufacturer and approximately 30% higher than the values reported by others for the same boron carbide but when using a cuboidal specimen geometry.
Distribution: Approved for public release
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Last Update / Reviewed: September 1, 2017