Defence Science Journal, Vol. 71, No. 2, March 2021, pp. 171-176, DOI : 10.14429/dsj.71.16113 © 2021, DESIDOC Frangibility Quantification of Frangible Bullet upon Impact on a Hard Target Xuan Son Bui@,*, Jan Komenda#, and Roman Vítek# @Department of Munition, Le Quy Don Technical University, Hanoi, Vietnam #Department of Weapons and Ammunition, University of Defence, Brno - 662 10, Czech Republic *E-mail:
[email protected] ABSTRACT The article presents a new method of quantitative evaluation of the degree of disintegration, called frangibility of frangible bullets, based on shooting experiments. On the basis of the dependence of the Frangibility Factor of the bullet on its impact velocity, the frangibility index is determined as a quantifier of the projectile’s ability to disintegrate into fragments applied for a certain range of interest. The method can be used to assess the ability to disintegrate into fragments of various types of bullets, preferably frangible bullets produced by powder metallurgy technologies. The proposed method was used to quantify the frangibility of five experimental frangible bullets. Keywords: Frangible bullet; Frangible ammunition; Frangibility; Frangibility Factor; Frangibility evaluation NOMENCLATURE 1. INTRODUCTION FFEM Frangibility factor (%) For traditional bullets, the functional evaluation of the FI Frangibility index (%.(m/s)-2) bullets in terms of terminal ballistics often is carried out using FF Mean value of frangibility factor between v and 1 2,3 4,5 EMS imp,max its penetration in the target , its ricochet , or wound ballistics . v (%) imp,min In addition to some basic evaluation for a traditional bullet, FF’ Arithmetic average of two values of frangibility factor EMS other evaluation methods are required for frangible bullets, at vimp,max and vimp,min (%) K Size coefficient which have different terminal ballistic properties.