The effects of fiber tow gaps, overlaps, and folds on the compressive strength of a fiber-placed composite laminate under dynamic loading conditions are investigated in this work. These layup defects were placed in the 0° fiber direction within a 24-ply quasi-isotropic laminate with a [45/0/–45/90]_3S stacking sequence. Different locations of the defect were considered, namely near the bottom (in the 2nd ply), middle (10th ply) and top (23rd ply) of the laminate. High-strain rate compression experiments were conducted on composite that are pristine and with embedded defects using a split Hopkinson pressure bar (SHPB). The results were used to determine the strength knockdown due to the local changes in ply morphology because of fiber bed compaction in the presence of a layup defect. The experimental results revealed the anisotropy of in-plane strength coinciding with the deposited defect orientation. No significant variations in the residual strength were observed regarding the location of the defect (i.e., bottom, middle, or top) within the laminate. A morphological analysis based on microtomography of the cured defects indicates that the sources of the strength knockdown are due to the 0° ply drop-off, fiber misalignment in the adjacent 90° and 45° degree plies and the resin-rich region formed at the corner of the tapered 0° ply, between +45° and –45° laminas. The present study indicates the increased role of local morphological ply variations on the strength of composites under high-strain rate loading conditions, which should be considered during composite design.

在这项工作中，研究了纤维丝束间隙、重叠和折叠对纤维放置复合层压板在动态载荷条件下的抗压强度的影响。这些叠层缺陷放置在 0° 纤维方向的 24 层准各向同性层压板中，具有 [45/0/–45/90] _3S堆叠顺序。考虑了缺陷的不同位置，即靠近层压板的底部（第 2 层）、中间（第 10 层）和顶部（第 23 层）。使用分裂式霍普金森压力棒 (SHPB) 对原始且带有嵌入缺陷的复合材料进行了高应变率压缩实验。结果用于确定由于存在铺层缺陷的情况下纤维床压实导致层片形态的局部变化而导致的强度降低。实验结果揭示了与沉积缺陷取向一致的面内强度的各向异性。未观察到关于层压板内缺陷位置（即底部、中间或顶部）的残余强度的显着变化。基于固化缺陷的显微断层扫描的形态分析表明，强度降低的来源是由于 0° 层脱落、相邻 90° 和 45° 层中的纤维未对准以及形成的富含树脂的区域锥形 0° 层的拐角，在 +45° 和 –45° 层板之间。目前的研究表明，在高应变率载荷条件下，局部形态层板变化对复合材料强度的影响增加，在复合材料设计过程中应考虑到这一点。