细长尖头刚性弹对金属靶板的斜侵彻/穿甲分析

给出细长尖头刚性弹（如尖卵、尖锥形）斜侵彻/穿甲金属靶的一个分析模型。在细长尖头弹对中厚度金属靶的斜穿甲中，韧性孔洞扩张为主要的穿甲机理；着靶初期，发生方向角的改变。研究表明，金属靶的斜穿甲仅由4个量纲一参数控制，即冲击函数I、弹体几何函数N、量纲一靶厚和撞击斜角。分析得到显式的侵彻深度、终点弹道极限、剩余速度和撞击方向改变角表达式。该模型可预期跳飞发生的临界条件。理论预期与实验结果吻合较好。

Oblique penetration/perforation of metallic plates by rigid projectiles with slender bodies and sharp noses

Oblique penetration/perforation of metallic plates by rigid projectiles with slender bodies and sharp nose shapes is studied in this paper. The mechanism of ductile hole enlargement dominates in whole penetration procedure. In the present model, the directional change δ is assumed to take place near the front surface when the projectile heading into the target and being subjected to asymmetric resistance. It clearly shows that the perforation of metallic plate is dominated by four non-dimensional numbers, i.e., the impact function I, the geometry function of projectile N , the non-dimensional thickness of target χ and the impact obliquity β . Explicit formulae are obtained to predict the penetration depth, ballistic limit, residual velocity and directional change for the oblique penetration/perforation of metallic plates. The proposed model is able to predict the critical occurrence of ricochet. The predicted results are verified by comparing with available and independent experimental data and existing models.