Barrel Friction in Sport Rifles

A method on the macroscopic length scale is developed to determine frictional energy losses between a homogeneous solid bullet and a twisted barrel. This accounts for the entire interaction between the bullet and the barrel surface, the drag due to the engraving forces, and possible friction-optimiz...

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Bibliographic Details
Published in:Tribology letters 2018-03, Vol.66 (1), p.1-10, Article 3
Main Authors: Sequard-Base, J., Haas, R., Tomastik, C., Vernes, A., Franek, F.
Format: Article
Language:English
Subjects:
Ballistics
Cartridges
Chemistry and Materials Science
Coefficient of friction
Corrosion and Coatings
Engraving
Friction
Lead free
Materials Science
Nanotechnology
Original Paper
Physical Chemistry
Projectiles
Rifles
Surfaces and Interfaces
Theoretical and Applied Mechanics
Thin Films
Tribology
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Summary:A method on the macroscopic length scale is developed to determine frictional energy losses between a homogeneous solid bullet and a twisted barrel. This accounts for the entire interaction between the bullet and the barrel surface, the drag due to the engraving forces, and possible friction-optimized bullet coatings. The method applied is based on the shot’s energy balance which requires as input parameters the bullet and barrel geometries, stress–strain curves of bullet and casing material, and muzzle velocity. The validation is done for a .22lr cartridge fired in a small bore match rifle. Additionally, the model is capable to give an average, system-specific coefficient of friction according to Amontons’ law, which could be an essential quantity for the tribological internal ballistics analysis, especially in the future development of lead-free bullets.
ISSN:1023-8883
1573-2711
DOI:10.1007/s11249-017-0951-4