Object

Alternative title:

Zastosowanie dział gazowych w badaniach wytrzymałościowych ziaren stałych materiałów miotających

Contributor:

Zbigniew LECIEJEWSKI

Abstract:

NATO Standardisation Agreements (STANAGs) 4241 and 4496 outline destructive testing procedures to determine how gun propellants in artillery munitions behave when struck by a 12.7 × 99 mm anti-tank projectile travelling at approximately 850 m/s, or by a standardised fragment (shrapnel) made from specific material and shape, moving at 1830 or 2530 m/s. Unlike traditional live-fire testing of complete munitions at test ranges, it is now possible to theoretically simulate the results of collisions between objects with specified dimensions, mass, and velocity, whether they involve individual grains or gun propellants (charge) confined within a shell case. These simulations, however, require detailed knowledge of the strength properties of propellant grains under both static and dynamic loading conditions, particularly at the high rates of deformation that can be generated in laboratory experiments using the Taylor impact test or the Split Hopkinson Pressure Bar (SHPB) method. A light-gas gun is often used in these experimental setups, propelling the test specimen by means of energy from compressed gas, such as hydrogen, nitrogen, or helium. Based on the author’s experience with maintaining a straight-line trajectory for expelled propellant grains, as well as ensuring a parallel contact plane between the grain’s leading face and the fixed partition, a new testing approach has been proposed. This approach uses the direct impact Hopkinson Pressure Bar (DIHPB) technique. Of the various Hopkinson methods available, DIHPB was selected. In this method, a propellant grain is attached to the output bar’s face, and the striker impacts the grain’s front face. Strain gauges on the output bar measure the crushing force. The deformation of the propellant grain is then tracked using a non-contact measurement setup (digital image correlation, or DIC).

Place of publishing:

Warszawa

Publisher:

Wojskowa Akademia Techniczna

Date created:

2010 r.0

Date submitted:

2025-06-30

Date accepted:

2025-08-06

Date issued:

2025-09-30

Extent:

B5

Identifier:

oai:ribes-88.man.poznan.pl:2745

Call number:

doi:10.5604/01.3001.0055.2664

Electronic ISSN:

2720-5266

Print ISSN:

2081-5891

Language:

angielski

License:

click here to follow the link

Rights holder:

Wojskowa Akademia Techniczna

Starting page:

121

Ending page:

140

Volume:

16

Journal:

PROMECH

Keywords:

gun propellant grains, mechanical properties, dynamic loads, Taylor test, split Hopkinson pressure bar method, light-gas gun