Delamination resistance of composite laminates can be improved with through-thickness reinforcement such as Z-pinning. This paper characterises the bridging response of individual carbon fibre/BMI Z-pins in mixed mode delamination at high loading rate using a split Hopkinson bar system. The unstable failure process in quasi-static tests, was also captured with high sampling rate instruments to obtain the complete bridging response. The energy dissipation of the Z-pins were analysed, and it was found that the efficacy of Z-pinning in resisting delamination growth decreased with an increase in mixed mode ratio, with a transition from pull-out to pin rupture occurring. The Z-pin efficacy decreased with loading rate for all mode mix ratios, due to the changing in failure surface with loading rate and rate-dependent frictional sliding.

复合厚度层压板（例如Z钉扎）可提高复合材料层压板的抗分层性。本文使用Hopkinson分离杆系统，以高负载率表征了混合模式分层中单个碳纤维/ BMI Z销的桥接响应。还使用高采样率仪器捕获了准静态测试中的不稳定故障过程，以获得完整的桥接响应。分析了Z销的能量耗散，发现Z销抵抗分层增长的功效随混合模数比的增加而降低，并且发生了从拉出到销断裂的转变。在所有模式混合比下，Z钉效率均随加载速率而降低，这是由于失效表面随加载速率和速率相关的摩擦滑动而变化的结果。