弹丸倾斜入射时40CrNi2Mo钢抗弹性能研究

为了研究弹丸倾斜入射时抗拉强度对钢板抗弹性能的影响,利用12.7mm穿甲燃烧弹对18mm厚不同抗拉强度的40CrNi2Mo钢板进行抗弹性能测试。观察钢板以不同倾斜角度放置时出现的损伤形貌,评定了安全角,并测量背凸高度,弹坑长度和深度,分析不同抗拉强度钢板在倾斜入射时的穿甲机理。结果表明,安全角随着抗拉强度的升高,呈现非单调变化的趋势。抗拉强度在1470MPa以下的钢板被倾斜击穿时,弹丸动能的大部分消耗在开坑和塑性扩孔阶段,安全角随抗拉强度升高而减小。抗拉强度超过1700MPa的钢板,其击穿弹坑仅有开坑区和冲塞破坏区,安全角再次随着抗拉强度的升高而减小。

Research of ballistic behavior of oblique 40CrNi2Mo steel targets with different strength

To research the influence of tensile strength on ballistic behavior of oblique steel targets, armor piercing projectiles of diameter 12.7 mm were fired at 40CrNi2Mo steel targets of 18 mm thickness with different tensile strength. The primary results were obtained by evaluation of critical angle, observing damaged steel oblique targets, and measurement of bulge height, craters length and depth. The penetration mechanics of oblique steel targets with different tensile strength were analyzed. The results show that the critical angle varies non-monotonically with increasing tensile strength. When the oblique steel targets with tensile strength below 1 470 MPa are penetrated, kinetic energy of projectile is mainly absorbed in cratering and ductile hole enlargement and the critical angle decreases with increasing tensile strength. Only cratering and plugging failure can be found in the penetrating craters of oblique steel targets with tensile strength above 1 700 MPa. The critical angle decreases again with increasing tensile strength.