Sunday 19th of November 2017
 

Residual Stress Calculation of Swage Autofrettage Gun Barrel


Liezhen Chang, Yutian Pan and Xinmou Ma

To calculate the residual stresses of swage autofrettage thick-walled cylinder, some simulations were run for different friction coefficients. It was found that the friction coefficient did not influence the residual stress and plastic radius. Thus, it is unnecessary to consider the effect of the friction coefficient on plastic radius and residual stress. Also utilized all equations of the spacial axisymmetric problem and boundary condition and continuity condition of swaging, the formula of plasic radius and the stress and strain of thick-walled cylinder and swage were deduced. Eventually by using the results of elastic analysis of unloading gun barrelthe formula of residual stress of gun barrel was derived. In oder to verify the accuracy, the theoretical value and the results of experiment were compared. The theoretical value shows good agreement with results of experiment.

Keywords: swage autofrettage; gun barrel; excess; plastic radius.

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ABOUT THE AUTHORS

Liezhen Chang
College of Science, North University of China, Taiyuan, 030051, P.R. China.

Yutian Pan
College of Mechatronic Engineering, North University of China, Taiyuan, 030051, P.R. China

Xinmou Ma
College of Mechatronic Engineering, North University of China, Taiyuan, 030051, P.R. China


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