Tribology Letters

, 66:3 | Cite as

Barrel Friction in Sport Rifles

  • J. Sequard-Base
  • R. Haas
  • C. Tomastik
  • A. Vernes
  • F. Franek
Original Paper
  • 50 Downloads

Abstract

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.

Keywords

Barrel friction Energy balance Coefficient of friction .22lr Sport rifle Internal ballistics 

Notes

Acknowledgements

This work was funded by the Austrian COMET-Program (Project K2, XTribology, No. 849109) and carried out at the “Excellence Centre of Tribology” in cooperation with the Armament and Defence Technology Agency of the Austrian Armed Forces.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  • J. Sequard-Base
    • 1
    • 2
  • R. Haas
    • 2
  • C. Tomastik
    • 1
  • A. Vernes
    • 1
    • 3
  • F. Franek
    • 1
  1. 1.AC2T research GmbHWr. NeustadtAustria
  2. 2.Armament and Defence Technology AgencyViennaAustria
  3. 3.Institute of Applied PhysicsTechnische Universität WienViennaAustria

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