1. Introduction
The artillery is an essential equipment and the main assault force. With the increase of war strength, it is important that to increase the performance of artillery. And the reliability of artillery is the most important. The barrel is a tubular parts which give projectile first speed and shoot direction. It not only to bear the gunpowder gas of high-pressure and high-temperature, but also suffering from the effect from high-speed projectile. The barrel chamber is called the ar...
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