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research-article

Gun Barrel Refurbishing Using a Shrink-fitted Autofrettaged Liner

[+] Author and Article Information
Mordechai Perl

Research Associate and Aaron Fish Professor Emeritus of Mechanical Engineering-Fracture Mechanics, Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
merpr01@bgu.ac.il

Joseph Perry

Fellow ASME, Pearlstone Center for Aeronautical Engineering Studies, Department of Mechanical Engineering, Ben-Gurion University of the Negev, Beer-Sheva 84105, Israel
josephperry@bezeqint.net

1Corresponding author.

ASME doi:10.1115/1.4039072 History: Received September 22, 2017; Revised January 03, 2018

Abstract

During the firing of guns, the barrel undergoes two major damaging processes: wear of its inner surface, and internal cracking. Barrel's are condemned based either on the increase of their internal diameter due to wear, or the severity of their internal cracking. The cost of replacing such a damaged gun barrel runs in the tenth of thousands of US$. Therefore, cost effective methods are sought for restoring such gun barrels. In the present analysis a new method is proposed for refurbishing vintage gun barrels by machining their inner damaged layer and replacing it by an intact, autofrettaged, shrink-fit liner that will restore the barrel to its original performance. The design of the shrink-fitted liner is based on two design principles. First, the von-Mises residual stress distribution through the thickness of the barrel at each of its cross sections along the inserted liner, should be at least equal in magnitude to von Misses stress, which prevailed in the original barrel. Second, once the maximum pressure is applied to the compound barrel, the von-Mises stresses at the inner surfaces of the liner machined barrel should be equal to their respective yield stresses. The preliminary results demonstrate the ability of this process to mend such barrels and bringing them back to their initial Safe Maximum Pressure (SMP) and their intact conditions, rather than condemn them. Furthermore, from the authors experience, based on a preliminary rough estimate, such an alternative seems to be cost effective.

Copyright (c) 2018 by ASME
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