Investigating T finned Barrels for Machine Guns: Enhancement in Heat Dissipation and Flexural Rigidity along with Weight Reduction
DOI:
https://doi.org/10.3849/aimt.01254Keywords:
machine gun barrel, high rate of fire, long duration of fire, heat dissipation, pseudo-I section, FEM analysisAbstract
This design innovation work is related to design and comparison of thermo-structural characteristics of a light weight machine gun barrel. Compared to traditionally used thicker profile counter parts of machine gun barrels, these barrels were concluded to have lighter weight, better heat dissipation capability and better flexural rigidity. These barrels do not have rigidity problems like finned pencil barrels and neither have extra weight addition as in case of thicker profile barrels (H-Bars). To conduct the analysis, two same length models of barrels bored for 5.56x45mm, of were constructed using Solidworks 15 software and the subsequent analysis using ANSYS 14.5 multi-physics solver, consisted of simulating the condition of cook-off, which is an almost steady state reached after firing 600 rounds in suppressive mode (for 5.56x45mm ammunition), which is expected from every durable machine gun. The results showing maximum heat flux were transported to structural analysis workbench to measure the longitudinal deformation in both the barrels under the gravity. The results concluded that T-finned barrels even after having less material, thus less weight, portrayed better heat dissipation characteristics and significantly less longitudinal deformation, thus better flexural rigidity and thus better accuracy retention, than the conventional unfinned H-Bars.References
HAMEED, A., AZAVEDO M. and PITCHER, P. Experimental Investigation of a Cookoff Temperature in a Hot Barrel. Defence Technology, 2014, vol. 10, no. 2, p. 86-91. https://doi.org/10.1016/j.dt.2014.05.006.
BANNISTER, E.L., JONES, R.N. and BAGWELL, D.W. Heat Transfer, Barrel Temperatures and Thermal Strains in Guns [Report]. Maryland: Army Ballistic Research Laboratories Aberdeen Proving Ground, 1963, 61 p.
ABHILASH, P. and CHOPADE, M.R. Analysis of Heat Transfer Coefficient inside Gun Barrel. International Journal of Current Engineering and Technology, 2016, no. 5. p. 460-463. ISSN 2277-4106.
YONGHAI, W.U. Analysis of Thick-Walled Cylinder Temperature Field based on the Thermal-Fluid-Solid Coupling. Research Journal of Applied Sciences, Engineering and Technology, 2013, vol. 5, no. 16, p. 4094-4100. ISSN 2040-7459.
ROJACZ, H., VARGA, M. and WINKELMANN, H. Deformation Mechanisms at Elevated Temperatures: Influence of Momenta and Energy in the Single Impact Test. International Journal of Mechanical and Mechatronics Engineering, 2013, vol. 7, no. 5, p. 877-883. https://doi.org/10.5281/zenodo.1061864.
FIŠER, M., PROCHÁZKA, S. and ŠKVAREK, J. Weapon Barrels (in Czech) [Textbook]. Brno: University of Defence, 2006, 200 p.
SEMAN, P. Deformation Analysis of Muzzle Part of Barrels (in Czech) [PhD Thesis]. Brno: University of Defence, 2011. 133 p.
CENGEL, Y.A. Heat Transfer: A practical Approach. [Textbook], [on-line], 2nd edition, 874 p. [cited 2018-02-12]. Available from: http://www.uotechnology.edu.iq/dep-materials/lecture/secondclass/HeatTransfer14.pdf.
MACKOWSKI, D.W. Conduction of Heat Transfer Notes for Mech 720 [Textbook], [on-line]. 242 p. [cited 2018-02-06] Available from: http://www.eng.auburn.edu/~dmckwski/mech7210/condbook.pdf.
SHIMPI, R.P., SHETTY, R.A. and GUHA, A. A Simple Single Variable Shear Deformation Theory for a Rectangular Beam. Journal of Mechanical Engineering Science, 2016, vol. 231, no. 24, p. 4576-4591. https://doi.org/10.1177/0954406216670682.
THAI, S., THAI, H.T., THUC, P.Vo. and PATEL, V.I. A Simple Shear Deformation Theory for Nonlocal Beams. Composite Structures, 2018, vol. 183, p. 262-270. https://doi.org/10.1016/j.compstruct.2017.03.022.
LILJA PRECISION RIFLE BARRELS, Inc. Drawing no. AR-10_740_18_mod. [cited 2018-01-10]. Available from: www.riflebarrels.com.
ABAQUS Analysis User’s Manual Version 6.7. SIMULIA Dassault Systemes, 2007.
DEBSKI, A., KONIORCZYK, P., LECIEJEWSKI, Z., PREISKORN, M., SURMA, Z. and ZMYWACZYK, J. Analysis of Heat Transfer in a 35 mm Barrel of an Anti-Air Craft Cannon. Problems of Mechatronics: Armament, Aviation and Safety Engineering, 2016, vol. 7, no. 3, p. 71-86. https://doi.org/10.5604/01.3001.0009.2983.
ANSYS Workbench Strain Life Approach Lectures [on-line], 2017. [cited 2018-01-13]. Available from: https://mycourses.aalto.fi/mod/resource/view.php?id=88051.
THOMPSON, M.K. and THOMPSON, J.M. Introduction to ANSYS and Finite Element Modelling. In: Eds THOMPSON, M.K. and THOMPSON, J.M. ANSYS Mechanical APDL for Finite Element Analysis. Oxford: Butterworth-Heinemann, 2017, p. 1-9. ISBN 978-0-12-812981-4, https://doi.org/10.1016/B978-0-12-812981-4.00001-0.
BACHOO, R. and BRIDGE, J. The Modal Density of Composite Beams Incorporating the Effects of Shear Deformation and Rotary Inertia. Journal of Sound and Vibration, 2018, vol. 423, p. 459-471. https://doi.org/10.1016/j.jsv.2018.01.013.
WANG, S., TONG, G. and ZHANG, L. Reduced Stiffness of Composite Beams Considering Slip and Shear Deformation of Steel. Journal of Constructional Steel Research, 2017, vol. 131, p. 19-29. https://doi.org/10.1016/j.jcsr.2016.12.003.
Downloads
Published
How to Cite
License
Copyright (c) 2019 Advances in Military Technology
This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.
Authors who publish with this journal agree to the following terms:
1. Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
3. Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work.
Users can use, reuse and build upon the material published in the journal for any purpose, even commercially.
