Acceleration of polymer bonded powder metal liner

Abstract

Polymer bonded, copper powder metal flexible sheet, called “plastic-metal” by these authors, is used as a liner in linear shaped charges for cutting metals in demolition, or works in which precise cut is needed in such as oil well works. In the experiments described in this paper, this liner material is subjected to explosive acceleration, and its velocity is measured using photonic Doppler velocity technique. Due to the poor reflectivity of liner to the laser beam, several setups were explored, with different levels of success. Preliminary results indicate that use of reflective foil on the liner surface or/and an extra layer of material to keep particles together is necessary to get back enough laser reflection to be able to perform any measurements. Preliminary results suggest that it should be possible to use PDV for measurement of surface velocity.