Penetration of Shaped-Charge Jets into Glass and Crystalline Quartz
Final technical rept. Jan 1984-Jan 1989
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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Penetration of shaped charge jets into glass and crystalline was studied by high-speed photography and flash radiography to identify behavior responsible for the effectiveness of glass against shaped charge threats. The behavior of crystalline quartz was relatively conventional. The greater effectiveness of silica and high-silica glasses was clearly indicated by an abrupt decrease in penetration velocity shortly after impact. High-speed photographs showed that the penetration path opened to its maximum diameter within a few when jet elements, disturbed by cavity closure, arrived at the penetration front. The penetration path in recovered targets was filled with a red copper-glass that resulted from an extended interaction between jet and target materials. Closure preceded brittle failure in the surrounding glass target, and it was concluded that primary closure is caused by recovery from high pressures near the penetration front.
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