Investigating T finned Barrels for Machine Guns: Enhancement in Heat Dissipation and Flexural Rigidity along with Weight Reduction
Keywords:machine gun barrel, high rate of fire, long duration of fire, heat dissipation, pseudo-I section, FEM analysis
AbstractThis 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.
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