Abstract: A disintegrable projectile is disclosed which utilizes thermal energy obted from the conversion of the kinetic energy of the air moving past the projectile to cause its fragmentation. The projectile employs an air intake nozzle axially disposed in the nose portion of the projectile and a resonance tube located in the body portion of the projectile in thermal contact therewith. The resonance tube develops the thermal energy which is transmitted to the body portion to cause the fragmentation thereof. The projectile of the present invention is intended for use in gunnery training and practice conducted within limited size training and practice ranges, where civilian personnel and property may be in proximate location.

Abstract: A disintegrable projectile is disclosed which utilizes thermal energy obted from the conversion of the kinetic energy of the air moving past the projectile to cause its fragmentation. The projectile employs an air intake nozzle axially disposed in the nose portion of the projectile and a resonance tube located in the body portion of the projectile in thermal contact therewith. The resonance tube develops the thermal energy which is transmitted to the body portion to cause the fragmentation thereof. The projectile of the present invention is intended for use in gunnery training and practice conducted within limited size training and practice ranges, where civilian personnel and property may be in proximate location.

Abstract: A fatigue cycle sensor can integrate force with respect to time. The sensor has a body with a bore. A plunger is mounted in the bore for relative motion therethrough in response to force applied behind the plunger. The plunger is sized for an interference fit in the bore. This interference fit results in deformation in response to relative motion between the plunger and body. The foregoing sensor has many applications including estimating fatigue in weapons.

Abstract: A split-ring hermetically sealed pressure enclosure is positioned around a ap formed between a shell body and base plate of a projectile for the purpose of measuring an unknown gap volume and comparing it to a standard acceptable volume. The system utilizes a gauging system which pressurizes both the known volume of the standard volume and unknown volume of the test body simultaneously and then measures the rate at which each volume is depleted. Fluidic sensing, amplifying, and gating systems are utilized for generating an output signal responsive to comparative pressure rate changes of both standard and test volumes. The output signal is used to operate a visual, biased, no-go, go pneumatic indicator.