In industrial processes, piercing and trimming are essential because composite structures are usually manufactured in a near-net shape to reduce machining operations. Punching and shear cutting using out-of-plane shear loading are expected to increase productivity. Nevertheless, little is known about the effects of such operations on polymer-matrix composites. This study presents on the characterization of piercing damage in typical carbon fiber reinforced plastic (CFRP) cross-ply laminates [0°₂/90°₂]_s after punching using quasi-static (QS) and drop-weight impact (DWI) loadings. During QS punching, the upper and lower ply interfaces delaminate due to the high shear stress to cut fibers and gradual shear deformation in the middle ply; however, during DWI punching at a low impact velocity, delamination of the lower ply interface can be reduced due to the localization of shear deformation, as compared to that in QS punching. Finally, the damage accumulation process during DWI punching is discussed.

在工业过程中，穿孔和修整是必不可少的，因为复合结构通常以近净形状制造，以减少机加工操作。使用平面外剪切载荷进行冲切和剪切切割有望提高生产率。然而，关于此类操作对聚合物基复合材料的影响知之甚少。本研究介绍了典型碳纤维增强塑料 (CFRP) 交叉层层压板 [0° ₂ /90° ₂ ] _s中刺穿损伤的表征使用准静态 (QS) 和落锤冲击 (DWI) 载荷冲压后。QS冲压过程中，由于高剪切应力切断纤维，中间层逐渐剪切变形，上下层界面分层；然而，在低冲击速度下的 DWI 冲压过程中，与 QS 冲压相比，由于剪切变形的局部化，下层界面的分层可以减少。最后，讨论了 DWI 冲压过程中的损伤累积过程。