箔爆発を利用した衝撃負荷装置とそのスポール破壊発生への応用

抄録

Thin metal foils of Cu, Al and Sn were electrically exploded by capacitor bank discharge (maximum energy; 1500 joules, ringing frequency; 70 kHz) to accelerate a thin plate projectile (flyer). Dependence of the flyer velocity on the foil thickness, capacitor voltage and shock transmitter thickness were studied. It was found that the flyer velocity is almost constant, irrespective of the kind and thickness of metal foils employed, if the calculated value of foil vaporization energy does not exceed a value equal to about 15% of the capacitor discharging energy. Spall experiments of polymers, glass and ionic crystals were made using this explosion system. In view of fracture morphology some interesting phenomena associated with the heal of crazes and cracks were observed. It is noteworthy that in spite of the low discharging energy delivered by the present apparatus the apparatus proved to be sufficiently useful for the study aimed.