INVESTIGATION OF THE HIGH SPEED IMPACT BEHAVIOR OF FIBROUS MATERIALS. PART I. DESIGN AND APPARATUS
FABRIC RESEARCH LABS INC BOSTON MA
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A high speed impact test machine was designed, constructed, and calibrated to test parachute components at high rates of loading. This instrument is capable of rupturing materials of up to 10,000 pounds static breaking strength at velocities of from 200 to 750 feet per second. The impacting force was applied by a free flying missile launched by a gas gun utilizing either nitrogen or helium gas at moderately low pressures. Pertinent data were obtained by means of multiple exposure photography. The resulting photograph records the specimen and the impacting missile before, during and after the impact. Measurement of the distances between successive exposures yields information such as the breaking strength, the extension to rupture, and the energy absorbed by the specimen. Author, modified-PL.