钨球对聚脲铝板结构的侵彻效应

Oblique penetration effect of a tungsten ball on aluminum plate structure with polyurea coating

为研究软质聚脲涂覆对2024铝板抗破片冲击性能的增强效应,通过弹道试验加载球形破片撞击不同聚脲涂覆复合结构,分析喷涂聚脲厚度和相对位置对复合板的抗冲击性能影响,基于高速相机和数字图像方法分析复合板的动态破坏,采用CT技术检测局部损伤和界面脱粘。结果表明:双面、背面涂覆聚脲均有效地提高铝板的抗冲击性能,低速度段到中速度段降低幅度大,超过50%,中速度段到高速度段降低幅度小,仅10%左右,涂覆方式对铝板抗冲击性能增强效应影响较小,且增强效应随着破片初速增大而降低;在527 m/s初速冲击下,10Al/2P和10Al/6P结构下破片速度衰减分别为75.5%和79.6%,随着涂层厚度的增加,复合材料板吸收更多的冲击动能;复合结构承受1000 m/s冲击载荷时,4和6 mm涂层厚度下速度衰减分别为20%和21.2%。

This paper is aimed at exploring the enhancement effects of the soft polyurea coating on anti fragmentation impact performance of 2024 aluminum plates.The study involves conducting a ballistic experiment loading spherical fragments to impact the composite structures of different polyeaur coatings;analyzing the effect of the thickness and the relative position of the polyeaur coatings on anti impact performance of the composite plate;analyzing the dynamic failure of the composite plate by a high-speed camera and the digital image method;and testing the local damage and interfacial debondin with CT technology.The results indicate that the anti impact performance of aluminum plates with polyurea coating on both sides or the reverse side is improved,and the maximum decrease more than 50%presents along the low velocity to medium speed segment,and the minimum decrease presents only about 10%,as which explains the coating ways has little influence on the impact resistance enhancement effect of aluminum plate,and the enhancement effect decreases with the increase of fragment initial velocity.On the initial velocity impact of 527 m/s,the fragment velocity attenuation of the plates with 10Al/2P and 10Al/6P structures are 75.5%and 79.6%,respectively,and the composite plate absorbs more impact kinetic energy with the increase of coating thickness.With the composite structure subjected to the impact load of 1000 m/s,the velocity attenuation with 4 and 6 mm coating thickness are 20%and 21.2%,respectively.