Dynamic bridging mechanisms of through-thickness reinforced composite laminates in mixed mode delamination. (March 2018)

• Record Type: Journal Article
• Authors: Cui, Hao; Yasaee, Mehdi; Hallett, Stephen R.; Partridge, Ivana K.; Allegri, Giuliano; Petrinic, Nik
• Is Part Of: Composites. Volume 106(2018)
• Page Start: 24
• Page End: 33
• Publication Date: 2018-03
• Subjects: A. Fracture toughness -- B. Failure -- C. Delamination -- D. 3-Dimensional reinforcement; Composite materials -- Periodicals; Manufacturing processes -- Periodicals; Composite materials; Manufacturing processes; Periodicals; 620.11805
• DOI: 10.1016/j.compositesa.2017.11.017
• Languages: English
• ISSNs: 1359-835X

Abstract

Abstract: 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.