弹 径 子弹的直径简称弹径，大体上来说，弹径越大，停止作用就越大。手枪的口径（11.43、9、7.62）普遍比步枪（7.62、5.8、5.56、5.45）大，就是停止作用要求的结果。不要小看这2--3毫米，就是这一点点的大小区别，所造成的创伤有天壤之别。
其主要影响因素有管的材料性质、径厚比、长径比以及子弹和管的弹径比。
The main influent factors include material properties, the proportion of diameter to thickness and diameter to length, and the proportion of diameter of missile to that of tube.
文中还得出了下述结论：穿甲深度正比于长杆弹的初始弹长而与弹的初始弹径无关。
A conclusion that the depth of penetration is proportional to the original length of penetrator and independent to the original diameter of the penetrator is also obtained.
分析了定径过程中钢管内金属流动和弹复行为。
Stress and metal flow in steel tube during sizing process were analyzed.
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