This paper reports deformation and damage evolutions of three-dimensional (3-D) braided composite with different braiding angles under multiple impact compression along longitudinal direction. Braided composites with braiding angle of 15°, 26° and 37° have been prepared for the compression tests. The impact compression test was conducted on a split Hopkison pressure bar (SHPB) along longitudinal direction. A high-speed camera was used to record damage development. A meso-scale finite element model has been established to simulate damage processes. The results show that the damage of composites occurs mainly in the first three impacts. For the 15° sample, damage of yarns and interface dominates the failure mechanisms at the first impact. For the 26° and 37° samples, the resin fracture and interface de-bonding lead to compressive failure at the first impact. Breakage and dislocation of yarns occurred for 15° sample during the subsequent two impacts, whereas it still keeps good structural integrity for 26° and 37° samples. The angle between adjacent yarns increased for the 26° sample and the yarns just tightened each other for 37° sample. Ductile damage is the primary damage mode for both yarns and resin during the multiple impacts.

本文报道了在纵向多重冲击压缩下，具有不同编织角度的三维（3-D）编织复合材料的变形和损伤演化。已准备好编织角度为15°，26°和37°的编织复合材料用于压缩测试。冲击压缩试验是沿纵向在分开的Hopkison压力杆（SHPB）上进行的。高速摄像头用于记录损坏情况。建立了中尺度有限元模型来模拟损伤过程。结果表明，复合材料的损伤主要发生在前三个冲击中。对于15°样品，在第一次冲击时，纱线和界面的损坏占主导地位的故障机理。对于26°和37°的样本，树脂断裂和界面剥离会在第一次冲击时导致压缩破坏。在随后的两次撞击中，15°样品发生纱线断裂和错位，而26°和37°样品仍保持良好的结构完整性。对于26°的样品，相邻纱线之间的夹角增加，而对于37°的样品，纱线之间刚好互相拉紧。韧性破坏是纱线和树脂在多次撞击中的主要破坏方式。