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Copper crushers - dynamic calibration in the laboratory

Kupferstauchkörper - dynamische Kalibrierung im Labor
: Warken, D.; Meineke, E.

10th International Symposium on Ballistics 1987. Proceedings
San Diego, 1987
International Symposium on Ballistics <10, 1987, San Diego/Calif.>
Fraunhofer EMI ()
Dynamik; Innenballistik; Kalibrieren; Kupferstauchkörper; Maximaldruckmessung; Meßei; Pendelschlagwerk; simulation; Stauchung

Copper crusher gauges are the traditional means to routinely determine peak pressures in large caliber weapons. Most attractive in this method is its simplicity in use. Questionable is the precision in reading the pressure in view of the cumbersome gauge calibration practice which is prone to errors, especially in the low temperature regime. For copper crusher gauges usually static calibration data is available. This data has to be corrected for dynamic effects in connection with the transient pressure build-up in a gun chamber. The correction depends on a number of parameters, mainly slope of the pressure-time curve and temperature. Consequently, dynamic calibration of a given batch of copper crushers has to be done for every type of weapon and every kind of ammunition and therefore calls for numerous shots in a real weapon. To simplify the procedure, a calibration device consisting of a pendulum apparatus and suitable damping mechanisms to simulate real pressure loads was built. This device proved to allow the calibration of a batch of copper crushers at little expense. To support that experimental work, the deformation of the copper crushers was numerically analyzed using the Finite Element Code ADINA. Experimental and theoretical results are presented. (EMI)