Design and Static Load Analysis Comparing Steel, Grey Cast Iron and Titanium Alloy as Materials for Breech Hinged Lugs in Recoil Weapons


  • Ekansh Chaturvedi Maulana Azad National Institute of Technology, Bhopal, India
  • Ravi Dwivedi Maulana Azad National Institute of Technology, Bhopal, India



short recoil weapons, wedge cam lugs, breech, barrel assembly, cam frame


This design innovation work is related to design validation of a short recoil weapons mechanism’s critical components in context of upper receivers. It explains a new mechanism for locking and unlocking of bolt with the breech and the subsequent advantageous design changes in the bolt’s construction. This design intends to build a new platform for a short recoil weapon chambered in 5.56x45 NATO ammunition which promises competency with its existing counter parts of same domain, but exhibiting exceptionally improved reliability due to elimination of interdependence of reciprocating cycles of barrel and bolt assemblies. This work involves the design of whole functioning system using Solidworks 2015 version and a static structural analysis to compare and choose the most suitable material among commonly used ones: steel AISI 4340, grey cast iron and titanium alloy, for locking lugs, being critical pair of components, using ANSYS 14.5. Results showed that titanium alloy was the most suitable material for the strength purpose. It is to be noted that this system can not only be utilized for assault rifles, but also for sub-machine guns, machine gun variants and even in handguns.


EKSERGIAN R. Theory and Design of Recoil Systems and Gun Carriages. Ordnance Department document No. 2035. Washington, 1921.

JOHNSON, J.R. and MELVIN, M. Firearm [US Patent]. US2094156A, 28. 9. 1937.

BROWNING, J.M. Automatic Firearm [US Patent]. US1618510, 22. 2. 1927.

Fedorov Avtomat [Wikipedia]. [cited 2018-01-10]. Available from: <>.

DOD: MIL-HDBK-5J, Department of Defense Handbook: Metallic Materials and Elements for Aerospace Vehicle Structures. 31. 1. 2003.

PURDY, D.J. Modelling and Simulation of a Weapon Control System for a Main Battle Tank. In Proceedings of the eighth US Army Symposium on Gun Dynamics.Newport, 1996.

NADEEM, A., BROWN, R.D. and HAMEED, A. Finite Element Modelling and Simulation of Gun Dynamics using “ANSYS”. In Proceedings of Tenth International Conference on Computer Modelling and Simulation. Cambridge, IEEE, 2008.

THOMPSON, M.K. and THOMPSON, J.M. Chapter 1 Introduction to ANSYS and Finite Element Modelling. ANSYS Mechanical APDL for Finite Element Analysis. Butterworth-Heinemann, 2017. ISBN 9780128129814.

OZMEN, D., KURT, M., EKICI, B. and KAYNAK, Y. Static, Dynamic and Fatigue Analysis of a Semi-automatic Gun Locking Block. Engineering failure analysis, 2009, vol. 16, no. 7. p. 2235-2244. ISSN 1350-6307.

SINGH, O. and SHARMA, S. Analysis and Comparison of Total Deformation of Welded Plates in Tensile and Fatigue Tests using ANSYS. Materials Today: Proceedings, 2017, vol. 4, no. 8, p. 8409-8417.

ANSYS Workbench Strain Life Approach Lectures. [on line]. [cited 2018-01-09].

AZO Materials [on line]. [cited 2018-01-10]. Available from: <>.

5.56×45 mm NATO. [Wikipedia]. [cited 2018-01-10]. Available from: .

DATER, P.H. and WONG, J.M. Effects of Barrel Length on Bore Pressure, Projectile Velocity and Sound Measurement. Seattle: Defense Technical Information Center, 2010.

PUCHI–CABRERA, E.S. et al. Fatigue Properties of a SAE 4340 Steel Coated with TiCN by PAPVD. International Journal of Fatigue, 2007; vol. 29, no. 3, p. 471-480.

TORRES, M.A.S. and VOORWALD, H.J.C. An Evaluation of Shot Peening, Residual Stress and Stress Relaxation on the Fatigue Life of AISI 4340 Steel. International Journal of Fatigue, 2002 vol. 24, no. 8, p. 877-886.

PENG, X.M. et. al. Ablation Behavior of NiCrAlY Coating on Titanium Alloy Muzzle Brake. Surface and Coatings Technology, 2013, vol. 232, p. 690-694.

HERTL, C., et al. Structural Characterisation of Oxygen Diffusion Hardened Alpha-tantalum PVD-coatings on Titanium. Materials Science and Engineering C, 2014, vol. 41, p. 28-35.




How to Cite

Chaturvedi, E., & Dwivedi, R. (2018). Design and Static Load Analysis Comparing Steel, Grey Cast Iron and Titanium Alloy as Materials for Breech Hinged Lugs in Recoil Weapons. Advances in Military Technology, 13(2), 265–275.



Technical Information