Open-cup and pressurized mechanical impact tests were conducted at White Sands Test Facility (WSTF) on Al-Li alloys (2090, 8090, and WL049) and Al alloy 2219 in various tempers. Pressure, drop height (potential energy), and environment [gaseous (GOX) or liquid (LOX)] oxygen were variables in the test program.
Reactions were detected in all alloys. The reaction sensitivity varied with specimen absorbed energy. Large, macroreactions occurred on specimen shear lips, a region that has very high deformation and is exposed to striker pin-specimen friction. Small microreactions occurred over many areas of the specimen. The effects of the test variables (pressure, drop height, LOX, GOX) on the frequency of macro- and micro-reations are discussed. The energy for fracture is usually less than, or equal to, the energy for (oxygen) reaction.
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