高强度钢板中的两种类型绝热剪切带

Two Types of Adiabatic Shear Bands in 40CrNi2Mo Steel Targets

利用穿甲燃烧弹撞击不同抗拉强度的40CrNi2Mo钢板,观察了弹坑周围绝热剪切带出现的位置和扩展方向,测量了弹坑剖面上绝热剪切带的总长度,分析了绝热剪切带与冲塞破坏的关系。按照扩展方向和出现位置的不同可以将钢板中的绝热剪切带划分为E型和P型,前者主要分布在合格损伤弹坑的剖面,基本沿着金属塑性变形流线向钢板正面扩展,不会直接引发冲塞破坏。后者主要分布在即将发生冲塞的钢板中,基本垂直于金属塑性变形流线向钢板背面扩展,它的出现表明钢板处于冲塞破坏的临界状态。

Armor piercing projectiles were fired at 40CrNi2Mo steel targets with different tensile strength. The primary results were obtained by observing propagation direction and location of adiabatic shear bands （ASB） around craters and testing the total length of adiabatic shear bands in the sectioned crater. The relationship between adia- batic shear bands and plug was analyzed. Adiabatic shear bands can be divided into two types on the basis of the difference in propagation direction and location in steel plate. Type E （hole enlargement） adiabatic shear bands are mainly found around the impact craters with acceptable damage, propagating towards the front surface of plate and parallel to flown lines. They are not the direct cause for formation of plug. Type P （plug） adiabatic shear bands are mainly found in targets which will be soon plugged, propagating towards the rear of plate and perpendicular to flown lines. The steel targets are on the edge of plugging in case of formation of type P adiabatic shear bands.