Journal
EXPERIMENTAL MECHANICS
Volume 56, Issue 8, Pages 1363-1372Publisher
SPRINGER
DOI: 10.1007/s11340-016-0175-9
Keywords
Composite; Through thickness reinforcement; Z-pin; Multiple delaminations; Mode II; CFRP
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Funding
- Rolls-Royce plc through the Composites University Technology Centre (UTC) at the University of Bristol, UK
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The application of Z-pinning is a subject of great interest in the field of through-thickness reinforcement (TTR) of composite laminates. To date, the majority of Z-pin characterisation work has been conducted on fracture coupons containing a single embedded delamination, which is often not representative of real failure of reinforced composite structures in service. In this investigation a test procedure to produce two independent Mode II delaminations was developed to analyse their interaction with a region of Z-pin reinforcement. Initially numerical models were used to optimise the chosen configuration. Experimental results show in detail the response of Z-pins to two independent delaminations. These results highlight the ability of the Z-pins to effectively arrest mode II delaminations at multiple levels through the sample thickness. Additionally they provide a much needed data set for validation and verification of Z-pin numerical modelling tools.
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