聚脲涂层复合结构抗侵彻机理实验研究

Penetration Mechanism of Polyurea Coating Composite Structure

为研究聚脲涂层复合靶板的抗侵彻性能,利用球形弹丸开展了相近面密度下的钢质靶板与喷涂聚脲涂层复合结构的弹道冲击实验,得到了钢靶与采用不同涂覆方式制备的聚脲涂层复合结构的抗侵彻性能,分析了失效模式和吸能机理。结果表明:冲击过程中,前聚脲涂层能有效缓冲弹体与钢靶之间的撞击载荷,使钢靶产生预变形,降低弹体的相对侵彻速度,延缓钢靶绝热剪切破坏的发生,提高复合结构的弹道极限;后聚脲涂层可与钢靶协调变形,形成冲塞质量块吸能,吸收弹体动能,在弹速较高时有较好的吸能能力。

For exploring the perforation mechanism of the polyurea coating composite structure, the ballistic tests in which the target was made of steel plate coated with elastomer were carried out. During the experiment, the damage modes of projectiles and targets were obtained and employed for further analysis. The pre-polyurea coating can effectively buffer the impact load between the spherical projectile and the steel target, so that the steel target is pre-deformed, the relative penetration velocity is reduced, resulting in further improving the ballistic limit of composite structure. The post-polyurea coating can deform coordinately with the steel plate and form a plug mass to absorb the kinetic energy of projectile. The results also show that the steel target with post-polyurea coating could achieve better energy absorbing at higher projectile velocity.