Abstract
In order to understand the microstructural reasons behind variations in ballistic performances, plate impact tests were conducted on two sintered silicon carbides with slightly different microstructures. The materials are referred to as Regular Hexoloy (RH) and Enhanced Hexoloy (EH) here. The porosity distribution in the EH samples had fewer large pores, leading to an 18% increase in flexural strength over that for RH samples. Plate impact experiments were conducted utilizing a VISAR to measure free surface velocities. The Hugoniot Elastic Limit (HEL) and spall strength for each material were determined. The spall strength was measured as a function of impact stress and pulse duration. Results show that the difference in porosity distribution between the EH and RH samples leads to no discernable difference in their HEL values and spall strengths. Both materials demonstrated finite spall strengths under loading above the HEL. Furthermore, the spall strengths were independent of the pulse width and showed a trend similar to that found in other studies on SiC.
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