Experimental Study on Response and Protection of Charge with Shell under High Velocity Fragment Impact.

The impact loading tests of shell charge with different guard plate thickness were carried out using the 25 mm smoothbore cannon, the failure modes change and charge reaction state of fragment and guard plate under impacting the charge with shell by 18.6 g standard fragment at 1 820-1 830 m/s velocity were obtained, the charge response degree were observed by high speed photography, and a protective structure that can reduce the reaction grade of the charge with shell was proposed. The results show that when the thickness of front guard plate is 10 mm, the failure mode of the front guard plate is same diameter perforation with a diameter of 28 mm, and the fragments penetrating the front guard plate form several large quality fragments. When the thickness of front guard plate increases to 16 mm, the spalling layer with a diameter of 37 mm is formed on the back of front guard plate and the fragments become dense small quality fragment groups. Compared with the charge combustion reaction caused by several large quality fragments, the dense small quality fragment groups are more easily to form multiple hot spots in the charge interior, which will lead to more intense deflagration reaction of the charge. The composite protection structure can effectively reduce the energy of fragment groups and play a good role in protecting the charge. [ABSTRACT FROM AUTHOR]