AN ULTRASONIC METHOD FOR TESTING THE ADHESION OF PLASTIC COATINGS ON PROPELLENT CHARGES

摘要

The reflection of ultrasonic pulses focussed on the bond between propellent and sleeve depends on the acoustic coupling at this interface, Some correlation between this reflection and the peel strength of the interface has been noted. The unwanted reflection from the interface between the liquid coupling and the sleeve is reduced by placing the probe at a small angle to the normal.