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RESEARCH PAPERS

# Dynamical Loading of the Muzzle Area of a Gun Barrel Including a Muzzle Brake

[+] Author and Article Information
Eckehard Bohnsack

Rheinmetall Waffe Munition GmbH, Branch Unterlüß, 29345 Unterlüß, Germany

J. Pressure Vessel Technol 128(2), 285-289 (Dec 16, 2005) (5 pages) doi:10.1115/1.2172961 History: Received December 07, 2005; Revised December 16, 2005

## Abstract

A modern tank gun for light vehicles should be light in weight and have a low recoil force. Therefore it needs an integrated muzzle brake that, however, reduces the strength in the muzzle area. The loading due to gas pressure in this area is as fast as the projectile, and some dynamical effects like traveling waves have to be taken into account. The analytical solution of traveling waves for a smooth tube will be explained on the basis of the shell theory for thin shells. The solution leads to a deeper understanding of the nature of these waves than a pure numerical solution. Since tubes are not really thin, even in the muzzle area, the error that may occur when applying the shell theory is estimated. The analytical solution will be compared to some finite element solutions, which include a multiperforated muzzle brake with a cover tube. The results give some useful hints to the interaction between gas pressure, projectile velocity, and wall thickness and help to reduce the weight of the barrel.

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## Figures

Figure 3

Dispersion relation (solid line) and various phase velocities (dashed lines)

Figure 4

Rheinmetall smoothbore tank gun 120mm LLR L/47

Figure 5

120mm LLR L/47: Radial displacement, the shown deformation is magnified by 100

Figure 6

120mm LLR L/47: Equivalent stress, the shown deformation is magnified by 100

Figure 7

120mm LLR L/47: Equivalent stress, the shown deformation is magnified by 100

Figure 1

Cylindrical shell with section forces and moments

Figure 2

Finite element solution of the first bending mode (n=2) in the deformed and undeformed state

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