弹头角速度与侵彻倾角对铝合金薄板损伤分析

快凝耐热铝合金已广泛应用于水陆两栖装甲车与轻型装甲侦察车车身等结构,由于车身铝合金材质的薄弱部件易受子弹撞击,导致车身关键部位所受损伤与破坏问题较为严重,因此有必要对铝合金薄板被子弹击穿时的损伤特性开展研究。本文通过ABAQUS仿真平台建立铝合金薄板与子弹弹头的显式动力学模型,研究了7.62 mm与9 mm两种不同口径的子弹弹头侵彻倾角、弹头自身角速度等参数对高强度铝合金薄板的损伤特性。结果表明:在相同侵彻倾角与子弹初速与角速度的情况下,9 mm子弹弹头对铝合金薄板造成的损伤程度更大,使薄板受到更大冲击; 7.62 mm子弹弹头对铝合金薄板的侵彻力度更大,有更好的贯穿特性; 随着子弹角速度的增加,两种型号子弹弹头对铝合金薄板破坏程度先增大后减小,角速度为2 000 rad/s时达到临界值; 侵彻倾角影响矩形模板破坏程度,但该影响存在临界值,到达临界值前,子弹穿透能力较小; 到达临界值后,继续增大倾角不再增大穿透能力; 同时随着倾角的增大,9 mm子弹弹头对铝合金薄板生成的动能总体均先增大后减小,倾角为45°时对矩形模板产生的动能最大。

Influence of Warhead Angular Velocity and Penetration Angle onDamage Performance of Aluminum Alloy Sheet

Rapid solidification heat-resistant aluminum alloy has been widely used in amphibious armored vehicles,light armored reconnaissance vehicles and other structures. Since the weak parts of the aluminum alloy body are vulnerable to bullet impact,leading to serious damage and destruction of key parts of the body,it is necessary to study the damage characteristics of aluminum alloy sheet when it is punctured by bullet. In this paper,the explicit dynamic models of aluminum alloy sheet and bullet head were established through ABAQUS simulation platform,and the impact of angular velocity and penetration angle of 7.62 mm and 9 mm bullets on the damage characteristics of high-strength aluminum alloy sheet was studied. The results show that under the same penetration angle,initial velocity and angular velocity of the bullet,the damage of the aluminum alloy sheet caused by the 9 mm bullet is greater,and the sheet is more impacted. The 7.62 mm bullet penetrates the aluminum alloy sheet with greater force and better penetration characteristics. With the increase of the bullet angular velocity,the damage degree of the two types of bullet heads to the aluminum alloy sheet first increases and then decreases,reaching the critical value at 2 000 rad/s. The penetration angle affects the damage degree of the rectangular template,but there is a critical value for this effect. Before reaching the critical value,the penetration ability of the bullet is small. After reaching the critical value,the penetration capacity will not increase with the increase of the inclination angle. At the same time,with the increase of the inclination,the kinetic energy generated by the 9 mm warhead on the aluminum alloy sheet generally increases first and then decreases,and the kinetic energy generated on the rectangular template is the largest when the inclination is 45°.