A stage is arranged between the conical barrel and the column barrel, the motive power action of the machine separating is enhanced, and the lengthof a rolling barrel is reduced.
在锥筒与圆柱筒之间设置了台阶，加强了机器分选的动力作用，并可减小滚筒的长度。
2
By means of numerical calculation, the rules of J-Integral values varied with the length and depth of the inner surface crack of gun barrel were obtained.