高强度钢在高速冲击载荷下的动态响应 ?

为了探讨高强度钢板在高速冲击载荷下的动态行为，用１２．７ｍｍ钢芯穿甲弹垂直射击ＣｒＭｏ、ＳｉＭｎＭｏ和ＣｒＮｉＭｎＭｏＢ钢靶板，靶板硬度为ｄ＿（ＨＢ）＝２．７０～３．５０ｍｍ。对穿甲机制进行了分析，讨论了绝热剪切带的形成原因及其在冲塞穿甲中的作用。从弹丸能量和弹坑容积的关系出发，探讨了穿甲机制和抗弹性能的差异。试验结果表明：穿甲机制和抗弹性能取决于钢板的厚度和硬度。在较高硬度时，由大量剪切变形而产生的绝热剪切带将导致冲塞破坏。当ｄ＿（ＨＢ）＝３．０～３．２ｍｍ时，钢靶板呈现出混合型穿甲机制，并显示出较好的抗弹性能。

DYNAMIC RESPONSE OF HIGH STRENGTH STEELS TO PROJECTILE IMPACT

Armour piercing projectiles of diameter 12,7mm were fired on high strength steel plates in normal impact in order toinvestigate the dynamic behavicurs of the steels to projectile impact.Petforation mechanism and the formation of adiabatic shear band were discussed in relation to the explanation of plugging perforation.Kfnetic energy of projectiles versus penetration volume were presentedto illustrate perforation mechanism and ballistic limit of different steelplate.It is shown by the results that hardness of steel plates is the keyfactor to perforation mechnanism and lallistic limit .Adiabaic shear band due to high shearing strain and strain rate may brings about plugging perforation, Mixed perforalion mecbanism of pluggig and ductile hole enlargement with a rather beter ballististic limit appears as the hardness of the steel plates is within d_(HB)=3.0～3.2mm.