Dynamic bridging mechanisms of through-thickness reinforced composite laminates in mixed mode delamination
Dynamic bridging mechanisms of through-thickness reinforced composite laminates in mixed mode delamination
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DOI：
10.1016/j.compositesa.2017.11.017
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发表时间：
2018-03
影响因子：
8.7
通讯作者：
H. Cui;H. Cui;M. Yasaee;S. Hallett;I. Partridge;G. Allegri;N. Petrinic
中科院分区：
文献类型：
--
作者：
H. Cui;H. Cui;M. Yasaee;S. Hallett;I. Partridge;G. Allegri;N. Petrinic
复合材料层压板的抗分层性可以通过全厚度加固（例如 Z 形钉扎）来提高。本文描述了使用分离式霍普金森杆系统在高负载率下混合模式分层中单个碳纤维/BMI Z 销的桥接响应。准静态测试中的不稳定失效过程也可以用高采样率仪器捕获，以获得完整的桥接响应。对Z-pin的能量耗散进行了分析，发现Z-pinning抵抗分层生长的功效随着混合模比的增加而降低，并发生从拔出到pin断裂的转变。对于所有模式混合比，由于失效表面随加载速率和速率相关的摩擦滑动而变化，Z 销功效随加载速率而降低。
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.