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Research Papers: Design and Analysis

Gun Barrel Refurbishing Using a Shrink-Fitted Autofrettaged Liner

[+] Author and Article Information
J. Perry

Pearlstone Center for Aeronautical
Engineering Studies,
Department of Mechanical Engineering,
Ben-Gurion University of the Negev,
Beer-Sheva 84105, Israel

M. Perl

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

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received September 22, 2017; final manuscript received January 3, 2018; published online February 22, 2018. Assoc. Editor: Yun-Jae Kim.

J. Pressure Vessel Technol 140(2), 021203 (Feb 22, 2018) (5 pages) Paper No: PVT-17-1188; doi: 10.1115/1.4039072 History: Received September 22, 2017; Revised January 03, 2018

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 on either 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 U.S.$. 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 Mises 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.

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References

Seely, F. , and Smith, J. , 1965, Advanced Mechanics of Materials, 2nd ed., Wiley, New York.
Hasenbein, R. G. , 2004, “ Wear and Erosion in Large Caliber Gun Barrels,” Benet R&E Laboratories, Watervliet, NY, Paper No. RTO-MP-AVT-109.
Kapp, J. A. , Fujczak, R. R. , Witherell, M. D. , Hickey, T. M. , and Zalinka, J. J. , 1990, “ Fracture Mechanics Assessment of a Cracked 16-Inch Inner Diameter 1945 Vintage-Jacketed Pressure Vessel,” Benet R&E Laboratories, Watervliet, NY, Report No. ARCCB-TR-90003.
Parker, A. P. , and Kendall, D. P. , 2001, “ Residual Stresses and Lifetimes of Tubes Subjected to Shrink Fit Prior to Autofrettage,” ASME J. Pressure Vessel Technol., 125(3), pp. 282–286. [CrossRef]
Jahed, H. , Farshi, B. , and Karimi, M. , 2006, “ Optimum Autofrettage and Shrink-Fit Combination in Multi-Layer Cylinders,” ASME J. Pressure Vessel Technol., 128(2), pp. 196–200. [CrossRef]
Chakrabarty, J. , 1987, Theory of Plasticity, McGraw-Hill, New York.
Perry, J. , and Perl, M. , 2008, “ The Evaluation of the 3-D Residual Stress Field Due to Hydraulic Autofrettage in a Finite Length Cylinder Incorporating the Bauschinger Effect Factor Based on the ‘Zero Offset Yield Stress,” ASME Paper No. PVP2008-61032.
Perry, J. , and Perl, M. , 2008, “ A 3-D Model for Evaluating the Residual Stress Field Due to Swage Autofrettage,” ASME J. Pressure Vessel Technol., 130(4), p. 0412116. [CrossRef]
Perl, M. , and Perry, J. , 2006, “ An Experimental-Numerical Determination of the Three-Dimensional Autofrettage Residual Stress Field Incorporating Bauschinger Effect,” ASME J. Pressure Vessel Technol., 128(2), pp. 173–178. [CrossRef]
Perry, J. , Perl, M. , Shneck, R. , and Haroush, S. , 2006, “ The Influence of the Bauschinger Effect on the Yield Stress, Young's Modulus, and Poisson's Ratio of a Gun Barrel Steel,” ASME J. Pressure Vessel Technol., 128(2), pp. 179–184. [CrossRef]

Figures

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Fig. 1

Concentric cylinders assembled with interference fit

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Fig. 2

Pressure distribution for simulating swage and hydraulic autofrettage

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Fig. 3

von Mises stresses for shrink-fitted and monoblock barrels after assembling

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Fig. 4

von Mises stresses for shrink-fitted and monoblock barrels under maximum pressure

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Fig. 5

Typical residual stresses after 100% swage autofrettage

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Fig. 6

A typical tangential and von Mises stresses after assembly

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Fig. 7

The operational stresses in compound cylinder at SMP

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Fig. 8

SMP improvement for the compound barrels

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Fig. 9

The assembling temperature

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