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research-article

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, P. R. China
yqb182@163.com

Guolai Yang

School of Mechanical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, P. R. China
yyanggl@njust.edu.cn

1Corresponding author.

ASME doi:10.1115/1.4041974 History: Received June 10, 2018; Revised November 07, 2018

Abstract

The stress response of barrel in firing is directed by the loading condition that mainly involves the gas pressure and contact force with projectile. In this paper, a barrel and projectile coupled dynamic model is first established for a better understanding of the stress response of artillery barrel. The follow-up boundary for gas pressure, which is controlled by timely position of projectile, is then implemented with the assistance of the developed user-defined subroutines in ABAQUS/Explicit software. Considering the radial effect of gas pressure, some numerical simulations of the dynamic loading process of barrel are carried out. By this, the evolution process of barrel stress distribution is obtained and it provides a visualized inspection of barrel dynamic response. If merely consider the contact force, the calculated dynamic stress can reach the peak value of 181MPa. It reflects the significant effect of contact force on the barrel dynamic response. Following this, the effect of propellant combustion temperature on dynamic response is also explored, and the obtained results show that higher initial temperature brings more pronounced dynamic response. Moreover, the differences of computed stress distribution in barrel reveal the deficiency of the static strength theory in respect of the simplification of working condition, such as the omission of contact force and dynamic characteristics. This paper proposes an alternative investigation approach of the dynamic stress response of barrel during interior ballistics process, and provides applicable references to the update of barrel strength theory and the prediction of firing reliability and safety.

Copyright (c) 2018 by ASME
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