Mg/Al波纹复合板抗冲击性能研究

目的 比对波纹轧制结构和平面复合结构的Mg/Al复合板抗冲击性能与吸能机制.方法 采用波纹辊轧制工艺制备Mg/Al复合板,使用半球形铝合金弹丸对传统平面复合板与波纹复合板进行不同速度下的冲击试验研究,并对比分析2种复合板的损伤机理,探明波纹结构对复合板抗冲击性能的影响.结果 Mg/Al平面复合板抗半球形弹丸冲击的吸能机制主要是通过靶板的塑性变形、剪切破坏、拉伸断裂、分层破坏和弹丸与靶板间摩擦等形式来吸收能量.波纹复合板对冲击能量的吸收主要依赖靶板的局部塑性变形、沿着波纹方向的开裂、结合界面的分层以及弹丸与靶板间的摩擦耗能.结论 当冲击速度低于弹道极限速度时,波纹复合板的抗冲击性能优于平面复合板,高于弹道极限速度时,2种复合板的抗冲击性能和耗能程度相当.

Impact Resistance of Mg/Al Corrugated Composite Plate

The work aims to compare the impact resistance and energy absorption mechanisms of corrugated Mg/Al composite plate and planar Mg/Al composite plate. The Mg/Al composite plate was prepared by corrugated rolling, and the impact test of traditional planar composite plate and corrugated composite plate was carried out by hemispherical aluminum alloy projectile at different speed. The damage mechanisms of these 2 types of composite plates were compared and analyzed, and the influence of corrugated structure on the impact resistance of composite plate was proved. The energy absorption mechanism of planar Mg/Al composite plate against the impact of hemispherical projectile was mainly through the forms of plastic deformation, shear failure, tensile fracture, delamination failure and friction between projectile and target. The impact energy absorption of corrugated composite plate mainly depended on the local plastic deformation of the target plate, the cracking along the corrugated direction, the delamination of the bonding interface and the friction energy dissipation between the projectile and the target plate. When the impact velocity is lower than the ballistic limit velocity, the impact resistance of the corrugated composite plate is better than that of planar composite plate, and when the impact velocity is higher than the ballistic limit velocity, the impact resistance and energy dissipation of the 2 composite plates are similar.