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RESEARCH PAPERS: Interior Ballistics

Mechanism of Interior Ballistic Peak Phenomenon of Guns and Its Effects

[+] Author and Article Information
Chenli Tao

State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China; Shijiazhuang Mechanical Engineering College, Shijiazhuang, Hebei 050003, Chinatao_tcl@hotmail.com

Yurong Zhang, Changzhi Jia, Yongjian Li, Xifa Zhang

 Shijiazhuang Mechanical Engineering College, Shijiazhuang, Hebei 050003, China

Sanqun Li

 Shijiazhuang Mechanical Engineering College, Shijiazhuang, Hebei 050003, China; School of Mechatronics Engineering, Beijing Institute of Technology, Beijing 100081, China

Zhengjia He

State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi 710049, China

J. Appl. Mech 77(5), 051405 (Jun 09, 2010) (5 pages) doi:10.1115/1.4001561 History: Received July 31, 2009; Revised January 29, 2010; Posted April 12, 2010; Published June 09, 2010; Online June 09, 2010

The erosion and wear in the gun barrel will get worse with an increase in the number of projectiles fired. Generally speaking, the ballistic performance of the gun, measured through indicators such as the maximum pressure pm and the muzzle velocity v0, will decrease gradually due to gun barrel erosion. However, the above analysis does not agree with the firing test data of certain types of guns, especially of some small-caliber guns. The ballistic performance of such guns will exhibit an increase to their peak values followed by a gradual decrease with the number of rounds fired. This is the so-called interior ballistic peak phenomenon, also named as the hump effect. Taking several kinds of guns as examples, such as a 76 mm gun and a 100 mm gun, we calculated the engraving pressure p0 of the guns by an approximate method and built a lumped-parameter interior ballistic model of the guns that exhibits the effect, according to the interior ballistics theory of guns with erosion and wear. The results of the modeling of the guns under different wear conditions are close to the test data, showing the existence of the peak values of pm and v0. The simulation results of some of the other guns that exhibit this phenomenon also show good agreement. Furthermore, it can explain the double-peak phenomenon for some types of guns with double driving bands. It was proven that the mismatch of the structure and the dimensions of the gun bore with those of the projectile driving band is the fundamental cause of this effect. Due to the mismatch, the engraving pressure will first increase and then decrease with the enlargement of the bore dimensions caused by barrel erosion and wear. The variation in the engraving pressure p0 will inevitably lead to the variation in interior ballistic performance in the life cycle of the gun. This observed process appears to explain the interior ballistic peak phenomenon.

FIGURES IN THIS ARTICLE
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Copyright © 2010 by American Society of Mechanical Engineers
Topics: Pressure , Guns , Mechanisms
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Figures

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Figure 1

Variation in muzzle velocity v0 of guns with erosion and wear: Δd is the enlargement of diameter at the commencement of the rifling and Δv0/v0 is the relative variation in muzzle velocity v0

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Figure 2

Sketch of the shoulder and the driving band: (a) an ordinary gun and (b) a gun with the ballistic peak effect—tsh=(d1-d)/2, d is the diameter of the gun (between the lands), d1 is the diameter between the grooves, l1 is the axial length of the driving band, i.e., KE, and l2 is the axial length of the shoulder, i.e., MP

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Figure 3

Typical deformation resistance curve in the engraving process

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Figure 4

Typical change of engraving pressure p0 in ballistic peak effect

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Figure 5

Structure of shoulder and driving bands for guns with double peaks

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