火炮发射一定数量炮弹后，身管容易出现裂纹，从而影响射击安全性。
Launching a certain amount of ammunition, it is easy to produce crack in the gun barrel and that will have effect on the security of fire.
结果表明：增加压缩量可以提高O形圈的密封性，同时也使其容易出现裂纹；
The results indicate that increasing the compression of O-ring can improve the sealing performance, simultaneously, can make it prone to crack ;
可见刀轮角度越小，越容易出现横向裂纹。
That is, the smaller scribe-wheel Angle is, the easier lateral crack is to appear.
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