LOX/GOX Mechanical Impact
This test method allows the determination of compatibility and relative sensitivity of materials with Liquid Oxygen (LOX) and Gaseous Oxygen (GOX) under impact energy using the Army Ballistic Missile Agency (ABMA) type impact tester (modified to allow the test specimen to be positioned within a pressurized test chamber to any pressure up to 10,000 psig). This procedure addresses testing with near-100 percent oxygen environments or oxygen-enriched atmospheres. Samples are placed in the test chamber and exposed to either atmospheric LOX, pressurized LOX or GOX. A striker pin is positioned on top of the sample in the center of a holding cup. A nominal 20-lb plummet is then dropped from selected heights onto the striker pin to deliver energy to the test specimen. A reaction is observed by consumption of the test sample, detection of a flash of light from a photocell, detection of a pressure rise in the test chamber, or char/melting that is visually evident on the test sample after the test. Drop tests are continued, using a fresh specimen and specimen cup, for each successive drop until the threshold reaction energy is determined. This energy reaction threshold is defined as 0 reactions in 20 successive drops at a specific energy level (1 ignition out of 60 is also acceptable). A threshold reaction pressure can also be determined by achieving 0 reactions in 20 successive drops at the highest pressure (constant drop energy) at which this result can be obtained.
Performed at NASA White Sands Test Facility.
List of Standards