铝合金框架结构的弹体穿击损伤特性

Bullet Penetration Damage Characteristics of Aluminum Alloy Frame Structure

针对直升机机身框架易受子弹弹击导致损伤问题,有必要开展机身铝合金框架结构的子弹穿击损伤特性研究。基于ABAQUS软件平台,采用修正后的Johnson-Cook模型,建立机身铝合金框架弹伤冲击的显示动力学模型,研究子弹弹头倾角和子弹材料等参数对铝合金框架的损伤特性影响。结果表明:弹头倾角影响子弹穿透能力,但该影响存在临界值,到达临界值前,子弹穿透能力随着倾角的减小而增大;到达临界值后,继续减小倾角不再增大穿透能力;同时随着倾角的减小,框架的损伤面积先增大后减小,倾角为45°时损伤面积最大。子弹材料影响子弹的强度和刚度,影响子弹的穿透能力和破坏能力,计算结果表明铜质子弹的穿透能力大于钢质子弹,钢质子弹破坏能力大于铜质子弹。

In view of the problem that the main frame of the helicopter fuselage is vulnerable to bullet damage,it is necessary to carry out the research on the bullet penetration damage characteristics of the aluminum alloy main frame structure of the fuselage.Based on the ABAQUS software platform,the display dynamics model of bullet injury impact of aluminum alloy frame was established by using the modified Johnson-Cook model.The effects of bullet angle and bullet material on the damage characteristics of aluminum alloy frame were studied.The results show that the inclination angle of the warhead affects the penetration ability of the bullet,but there is a critical value for this effect.Before reaching the critical value,the penetration ability of the bullet increases with the decrease of the inclination angle.After reaching the critical value,the inclination angle continues to decrease and no longer increases the penetration ability.At the same time,the damage area of the frame increases first and then decreases with the decrease of the dip angle,and the damage area reaches the maximum when the dip angle is 45°.The bullet material affects the strength and stiffness of the bullet,and affects the penetrating ability and destructive ability of the bullet.The calculation results show that the penetrating ability of the copper bullet is greater than that of the steel bullet,and the destructive ability of the steel bullet is greater than that of the copper bullet.