IMPACT TESTING USING A FOUR-INCH AIR GUN AND LEAD TARGETS
HARRY DIAMOND LABS ADELPHI MD
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This report evaluates an HDL method of testing fuzes and fuze components for ruggedness. The test items are mounted in projectiles and fired from an air gun into 3- to 10-in. thick lead blocks. The projectile deceleration upon striking this target provides the test. The evaluation is based on 3 years of routine test data. The measured quantity of primary interest is the peak acceleration obtained from copper ball accelerometers. These measurements indicate that structures or components with natural frequencies of hundreds of Hertz experience peak accelerations of 5000 to 50,000 g. Hundreds of thousands of gs, however, have been measured at natural frequencies greater than 10 kHz. Such measurements may differ by factors of two at different points within the projectile. This report presents a brief description of the air-gun design and test techniques, the advantages and disadvantages of using the copper ball accelerometers for these measurements, and the target penetration phenomena since they provide the force pulses experienced by the projectile. The usual constant retarding force law and the Poncelet solid penetration law are applied in this study.
- Test Facilities, Equipment and Methods
- Ammunition and Explosives