To study the static penetration resistance of brittle materials,the Griffith\'s biaxial-stress criterion was used for the yield criterion of brittle materials.

In the paper effects of et incidence angle on penetrationability is studied by experiment and analysis,The results show that the rules of incidence angle effects for homogenous armour steel and glass fiber reinforced plastics are different The former et penetration ability decreases with the increase of the incidence angle,but the latter is opposite from the former.

The study and injection molding of high-performance tungsten alloy to improve the penetration ability of armour-piercing shell and APHE are introduced.

In this paper,40home -made revolvers were examined and the bullet speed -testing,fire range testing and bullet penetrating powe r testing were conducted.