Dynamic bridging mechanisms of through-thickness reinforced composite laminates in mixed mode delamination

作者：Cui Hao^*; Yasaee Mehdi; Hallett Stephen R; Partridge Ivana K; Allegri Giuliano; Petrinic Nik

来源：Composites Part A: Applied Science and Manufacturing , 2018, 106: 24-33.

DOI：10.1016/j.compositesa.2017.11.017

• Fracture toughness
• Failure
• Delamination
• 3-Dimensional reinforcement

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.

• 出版日期2018-3