REPUBLIC OF SERBIA

MINISTRY OF DEFENCE

www.mod.gov.rs

MINISTRY OF DEFENCE

Material Resources Sector

Defensive Technologies Department

Military Technical Institute

www.vti.mod.gov.rs

A Method of gunpowder grain shape optimization

stefan jovanović

Military academy, University of Defence, Belgrade, Generala Pavla Jurišića Šturma br. 33, 064/466-07-81 stefan.jovanovic.tesla@gmail.com

Abstract: In paper, optimization of the gunpowder grain shape and interior ballistic calculation using modified gunpowder grain is given. Using mathematical model of classic interior ballistic calculation and condition of constant pressure of the gunpowder gases during burning process of the gunpowder, function of burning surface of the gunpowder grain is determined. Analyzing function of burning surface, dimensions and shape of modified gunpowder grain had been determined. In order to get the results, classic interior ballistic calculation is applied for both gunpowder grain which is in current use and modified gunpowder grain optimized for usage as a composition of the gunpowder charge of the long range rifle 12.7mm M93. Comparison of the results between modified gunpowder grain shape and existing one is also given. Gunpowder charge consisted of modified gunpowder grain shape can significantly increase exploiting resources of certain weapon system without any changes of weapon and ammunition construction. Modified gunpowder grains with optimized dimensions can be used in any weapon system based on the same firing principle with similar results regardless of the projectile type.

Keywords: gunpowder, gunpowder grain.