While thin-plies delay the onset of matrix cracking and improve certain in-plane mechanical properties, the effect they have on the out-of-plane response remains unclear. We compared the impact resistance, tolerance and sequence of failure events of thin laminates manufactured with thin- or standard-ply non-crimp fabrics (fibre areal weight of 67 and 134 gsm per ply). Damage initiation and propagation was detailed using (a) quasi-static indentation and impact tests at incremental energy levels and (b) X-ray tomography. The analysis revealed the damage mechanisms underlying the observed load drops in the force-displacement curves. In the indented specimens, the 3D post-process ascribed matrix cracks and delaminations to their corresponding plies/interfaces. Standard-ply samples develop more extended delaminations and delay fibre failure, improving the load-carrying capacity and increasing compression after impact (CAI) strength by 27% for impact at 14 J.

尽管细线延缓了基体裂纹的发生并改善了某些面内机械性能，但它们对面外响应的影响仍然不清楚。我们比较了用薄层或标准层的非卷曲织物（每层纤维的单位面积重量为67和134 gsm）制造的薄层压板的耐冲击性，耐受性和破坏事件的顺序。使用（a）增量能量水平下的准静态压痕和冲击测试以及（b）X射线断层扫描详细描述了损伤的产生和传播。分析显示力-位移曲线中观察到的载荷下降的破坏机理。在有锯齿的样品中，3D后处理将基体裂纹和分层归因于其相应的层/界面。标准层样品会产生更多的分层现象并延迟纤维失效，