This paper investigates the effect of Z-pin insertion angles (60°, 75° and 90°) on low-velocity impact mechanical response and damage mechanism for cross-ply and quasi-isotropic layups. The laminates were impacted with 25 J, 40 J and 60 J to obtain different mechanical response and damage status (permanent dent, delamination and backside damage). Experimental results demonstrate that the impact resistance is reduced with the decreasing Z-pin insertion angles, which is accompanied by more severe backside cracking, larger impact dent and delamination area. This phenomenon is more significant in cross-ply laminates compared with quasi-isotropic layups. Additionally, 60° pinned cross-ply laminates show asymmetry delamination because the damage modes of Z-pins on both sides of the impact center are different, which results in the different delamination resistance of the two sides. These findings can give some guidance for choosing Z-pin insertion angles when Z-pinning in different layups.

本文研究了 Z 销插入角度（60°、75° 和 90°）对交叉层和准各向同性铺层的低速冲击机械响应和损坏机制的影响。层压板受到 25 J、40 J 和 60 J 的冲击，以获得不同的机械响应和损坏状态（永久性凹痕、分层和背面损坏）。实验结果表明，随着Z-pin插入角度的减小，抗冲击性降低，伴随着更严重的背面开裂、更大的冲击凹痕和分层面积。与准各向同性叠层相比，这种现象在交叉层层压板中更为显着。此外，60° 固定交叉层层压板由于冲击中心两侧的 Z 销损坏模式不同，出现不对称分层，这导致两侧的分层阻力不同。这些发现可以为在不同铺层中进行 Z-pinning 时选择 Z-pin 插入角度提供一些指导。