玻璃纤维增强铝合金层板高速冲击损伤容限

为研究玻璃纤维增强铝合金（GLARE）层板高速冲击损伤容限，对单次、多次冲击载荷下GLARE层板的损伤特性进行了高速冲击试验和数值仿真研究。采用一级气体炮，在GLARE层板靶板的中心位置、边位置、角位置进行弹道冲击试验，获取弹道极限和损伤模式，然后结合数值仿真剖析动态响应特性。结果表明，弹道冲击条件下，GLARE层板主要通过塑性变形、金属层裂纹、脱胶、复合材料纤维脆断等损伤模式吸收冲击能量。边界约束效应对GLARE层板冲击损伤特性具有显著影响，主要表现在：约束效应导致不同位置冲击下GLARE层板损伤模式不同，包括成坑、金属裂纹和冲塞等特征；角位置冲击条件下，GLARE层板的弹道极限速度明显低于中心位置冲击结果；重复冲击条件下，角位置比与边位置和中心位置更容易发生穿透。

Damage tolerance of GLARE laminates subjected to high-velocity impact

To investigate the damage tolerance of the GLAss fiber-REinforced aluminum (GLARE) laminates subjected to high-velocity impacts, the single and multiple impact performance of the GLARE laminates was studied by tests and numerical simulation. High-velocity impact tests were conducted on GLARE panels using a one-stage gas gun at different impact locations, i.e. middle point, edge point and corner point of the plate. The ballistic limit was thus obtained as well as the failure patterns, and the dynamic response was studied based on the numerical simulation. The results show that GLARE laminates absorb the impact energy mainly in the form of plastic deformation, metal cracking, debonding, and fiber breakage. The clamp constraint exerted great influences on the damage mechanism of the GLARE laminates subjected to impacts. The failure patterns in the GLARE laminates subjected to the impact load were distinctly affected by the constraint, i.e. denting and metal cracking, plugging characteristics etc. The ballistic limit velocity of the GLARE laminates impacted at the corner point of the plate was found to be much less than that impacted at the middle location of the plate. Compared with the middle and the edge points, the corner position of the plate subjected to multiple impacts was the most vulnerable to perforation.