Study on Transient Temperature and Stress of Gun Barrel Subjected to Periodic Pressure and Thermal Pulse

Long He ； Xiaorong Guan ； Cheng Xu

《International Core Journal of Engineering》 5卷9期 (2019/08) Pp. 85-94

https://doi.org/10.6919/ICJE.201908_5(9).0013

摘要

A large-caliber machine-gun is more firing rate, less weight and less barrel wall thickness. When firing continuously, the transient temperature and thermal-solid coupling stress have great influence on barrel strength as well as its operational safety. A FEA barrel model of thermal-solid coupling is established. The transient temperature and coupling stress of a large-caliber barrel under the effect of both periodic pressure and heat shock are presented. The FEA model is verified and the computational results are summarized below. (1) The bore surface temperature is shaped pulse. When shooting continuously, the pulse peak rises rapidly firstly and then slows down gradually. The exquisite change region focuses on the thin inner wall of bore. The estimation and improvement of large-caliber gun barrel life must consider the transient temperature data. (2) The coupling action of thermal shock and pressure pulse has great effect on the transient stresses of gun barrel. The radial stress is mostly induced by chamber-pressure; the axial stress is primarily induced by thermal load; the hoop stress is the coupling action of the chamber-pressure load and thermal load. The strength design of large-caliber gun barrel should consider the coupling action of thermal shock and pressure pulse.

關鍵字

Temperature field ； stress field ； thermal-solid coupling ； large-caliber machine-gun ； gun barrel

參考文獻

B. Lawton: The influence of additives on the temperature, heat transfer, wear, fatigue life, and self ignition characteristics of a 155 mm gun, Journal of Pressure Vessel Technology, vol. 125 (2003), p. 315-320.

E. Petitpas, B. Campion: Crack propagation in a gun barrel due to the firing thermo-mechanical stresses, Journal of Pressure Vessel Technology, vol. 125 (2003), no. 3, p. 293-298.

H.L. Lee, Y.C. Yang, W.J. Chang: Estimation of heat flux and thermal stresses in multilayer gun barrel with thermal contact resistance, Applied Mathematics and Computation, vol. 209 (2008), No. 2, p. 211-217.

M.L. Bundy, N. Gerber, J.W. Bradley: Gun barrel erosion and bore temperature modeling, Summer Computer Simulation Conference (1993), Boston, Massachusetts, USA, p. 397-402.

C. Xu, Y.H. Wu, X.R. Guan: The transient stress and life analysis of a gun tube, ASME 2014 Pressure Vessels & Piping Conference, Anaheim, California, USA.