Projectile impacts on hardened alloy steel plate

Orange, Lachlan (2013) Projectile impacts on hardened alloy steel plate. [USQ Project]

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Abstract

The use of steel armour plate targets for competitive sports shooting has been increasing in popularity over the last forty years. Steel armour used in battle may only be used for short periods and receive impacts only in the hundreds, from specific threats that occur in battle and the majority of past research is based around this. In contrast steel targets used in competition are subject to thousands of impacts over their life span, for a variety of commercially available projectiles. Hence the approach to their designs is more interested in the limit that causes no damage, rather than the limit which prevents total penetration.

This study deals with the impacts of commercially available target and hunting style projectiles impacting against 12mm Bisalloy 500, which is a common choice for targets in Australia. Five different projectiles were selected with the following matching characteristics; different diameter and similar mass, different diameter and similar length, same diameter and different length and same diameter with different nose shapes. The projectiles were fired into test plates at 25 m using matching and stepped velocities and their penetration depths recorded. Data was compiled in MATLAB and compared with the Allen Rogers penetration model and the Alekseevskii Tate penetration model.

Trends were identified with the long ogive hollow point projectiles when normalized, showing that there is a distinct pattern which cannot be predicated using the AR or AT model using the standard inputs. The AT model was able to be matched up with the penetration for the short and solid construction projectiles, giving a reasonable estimate for the penetration depth up to impacts around 950 m/s, where plates are very close to failure. It has been shown that there is a substantial difference in the penetration based on the construction of the projectile and short blunt projectiles have a far lower velocity threshold to prevent damage.

From this research the following maximum impact velocities have been recommended that will cause minimal (>0.5 mm) damage to 12mm Bisalloy 500. For long ogive hollow point projectiles a maximum impact velocity of 900 m/s and for solid short and blunt projectiles a maximum impact velocity of 750 m/s.


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Item Type: USQ Project
Item Status: Live Archive
Faculty / Department / School: Current - Faculty of Health, Engineering and Sciences - School of Mechanical and Electrical Engineering
Supervisors: Snook, Chris
Date Deposited: 24 Jun 2014 01:28
Last Modified: 24 Jun 2014 01:28
Uncontrolled Keywords: projectile impacts; hardened alloy; steel plate; competitive sports shooting
Fields of Research : 09 Engineering > 0913 Mechanical Engineering > 091308 Solid Mechanics
URI: http://eprints.usq.edu.au/id/eprint/24674

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