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Design Innovation Paper

Assessment of the Lifetime of Gun Barrels Under High-Speed Moving Loads

[+] Author and Article Information
Ophélie Chevalier

Nexter Systems,
7 route de Guerry,
Bourges F18000, France
e-mail: o.chevalier@nexter-group.fr

André Langlet

University of Orleans,
INSA-CVL
PRISME/DMS, EA 4229
Orléans F45072, France
e-mail: andre.langlet@univ-orleans.fr

Laetitia Fouché-Sanseigne

Nexter Systems,
7 route de Guerry,
Bourges F18000, France
e-mail: l.sanseigne@nexter-group.fr

Yann Guilmard

Nexter Systems,
7 route de Guerry,
Bourges F18000, France
e-mail: y.guilmard@nexter-group.fr

Due to industrial property concerns and for reasons of confidentiality, some numerical data or results (of strains and pressure, or material properties) are not communicated explicitly.

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received July 25, 2013; final manuscript received March 20, 2014; published online September 15, 2014. Assoc. Editor: Mordechai Perl.

J. Pressure Vessel Technol 137(1), 015001 (Sep 15, 2014) (9 pages) Paper No: PVT-13-1123; doi: 10.1115/1.4027306 History: Received July 25, 2013; Revised March 20, 2014

The aim of this work is to assess the influence of the dynamic stresses (due to the projectile displacement and the gas pressure) on the lifetime of certain medium caliber (less than 40 mm) gun barrels. First, an experimental study of tube dynamics under high speed loads was made. The large number of experimental measurements made it possible for us to identify the forcing effect of the projectile. In parallel, experimental samples were submitted to periodic traction-compression forces in order to obtain the material parameters of the barrels used in the study. Second, a finite element (FE) model was elaborated which faithfully forecasts the experimental strain records. Three-dimensional modeling permitted us to correctly evaluate the response in the zones of stress concentration. Third, a lifetime calculation was performed. This shows that the lifetime of the barrel is determined by the most constrained zones during firing: in the present case by the stresses appearing at the bottom of the grooves.

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References

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Figures

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Fig. 1

Normalized circumferential strain histories, when firing a full caliber shell (GPR) and an armor piercing fin discarding sabot projectile (APFSDS) (40 mm bore)

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Fig. 2

Normalized circumferential strains histories measured at two locations on the tube barrel and strains calculated only from the pressure using Lamé's formula (30-A barrel)

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Fig. 3

(a) Normalized circumferential strains measured on the 30-B barrel (GPR). (b) Corresponding Lame’s pressure and pressure obtained by subtracting the gas pressure from the Lame’s pressure (peaks labeled 1 to 5)

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Fig. 4

Influence of the material of the projectile band on the strains (20 mm barrel)

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Fig. 5

Influence of the temperature on the strains (20 mm barrel)

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Fig. 6

View of the projectile and driving band at time 1.02 ms, x∕L = 0.21. The rifling can be seen by transparency (in the band, maximum Von Mises stress in red is 819 MPa).

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Fig. 7

The breech pressure, the shot base pressure, and the base pressure in the 30-B barrel firing the GPR

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Fig. 8

Correlation between the simulation and the experiment at x∕L = 0.21, 30-B barrel

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Fig. 9

Correlation between the simulation and the experiment at x∕L = 0.28, 30-B barrel

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Fig. 10

Correlation between the simulation and the experiment at x∕L = 0.46, 30-B barrel

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Fig. 11

Correlation between the simulation and the experiment at x∕L = 0.57, 30-B barrel

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Fig. 12

Correlation between the simulation and the experiment at x∕L = 0.82, 30-B barrel

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Fig. 13

Normal and tangential contact forces components between the band and the bore

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Fig. 14

Von-Mises stresses computed with the pressure load only (time is 1.02 ms, stresses in MPa)

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Fig. 15

Von-Mises tresses computed with the pressure load and the projectile (time is 1.02 ms, stresses in MPa)

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Fig. 16

Enlarged section showing the stresses in region of interest where the grooves and the driving band are in contact (time 1.02 ms, stresses in MPa)

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