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Research Papers: Design and Analysis

Dynamic Stress Analysis on Barrel Considering the Radial Effect of Propellant Gas Flow

[+] Author and Article Information
Qingbo Yu

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Nanjing 210094, Jiangsu, China
e-mail: yqb182@163.com

Guolai Yang

School of Mechanical Engineering,
Nanjing University of Science and Technology,
Nanjing 210094, Jiangsu, China
e-mail: yyanggl@njust.edu.cn

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received June 10, 2018; final manuscript received November 7, 2018; published online December 7, 2018. Assoc. Editor: Oreste S. Bursi.

J. Pressure Vessel Technol 141(1), 011202 (Dec 07, 2018) (12 pages) Paper No: PVT-18-1114; doi: 10.1115/1.4041974 History: Received June 10, 2018; Revised November 07, 2018

The stress response of an artillery barrel when fired is principally due to loading from gas pressure and contact force with the projectile. This paper reports a research project in which a dynamic model of a barrel and a projectile was established in order to investigate the stress response of an artillery barrel. Calculations of propellant gas pressure, in part determined by the position of the moving projectile, were carried out using user-defined subroutines developed in the abaqus/explicit software. Numerical simulations of the dynamic loading process of the barrel were carried out to examine the radial effects of gas pressures. Using this methodology, the evolution of barrel stress distributions was simulated, providing a visualized representation of the barrel's dynamic response. The calculated dynamic stress due to projectile contact alone can reach a peak value of 181 MPa, reflecting the significant effect of contact force on the barrel's dynamic response. Following this, the effect of propellant combustion on the dynamic response was explored, and the results obtained showed that higher initial temperatures produced more pronounced dynamic responses. Moreover, significant differences in stress distributions computed for the barrel revealed deficiencies in the static strength theory for evaluating the operating conditions, due in part to the omission of contact force and other dynamic effects. This paper proposes an alternative investigative approach for evaluating the dynamic stress response of barrels during the initial phases of the ballistics process, and provides information that should lead to updates and improvements of barrel strength theory, ultimately leading to better predictions of firing reliability and operator safety.

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References

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Figures

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Fig. 1

The schematic diagram of barrel loading

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Fig. 2

Finite element meshes of entities modeled: (a) muzzle part, (b) enlarged detail of engraved band, and (c) projectile

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Fig. 3

Flow chart of code execution

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Fig. 4

The schematic diagram of the designed test scheme

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Fig. 5

The modal test map of barrel

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Fig. 6

Test system components

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Fig. 7

Time histories of average pressure and displacement

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Fig. 8

Time histories of contact force

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Fig. 9

The evolution of stress distribution in barrel

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Fig. 10

The stress curves of selected region along axial direction

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Fig. 11

The stress distribution evolution for cross section

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Fig. 12

The stress curves of selected region along radial direction

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Fig. 13

The time histories of stress components for chamber surface

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Fig. 14

The results by contact force

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Fig. 15

The time histories of average pressure along barrel length

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Fig. 16

The time histories of displacement

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Fig. 17

The time histories of velocity

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Fig. 18

The time histories of max stress

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Fig. 19

The sectional schematic view of the rifling barrel

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Fig. 20

The design pressure distribution along barrel

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Fig. 21

The static stress computation results

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