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Coupon scale Z-pinned IM7/8552 delamination tests under dynamic loading

Cui, H., Mahadik, Y., Hallett, S. R., Partridge, I. K., Allegri, G., Ponnusami, S. A. and Petrinic, N. (2019). Coupon scale Z-pinned IM7/8552 delamination tests under dynamic loading. Composites Part A: Applied Science and Manufacturing, 125, 105565.. doi: 10.1016/j.compositesa.2019.105565

Abstract

Dynamic impact onto laminated composite structures can lead to large-scale delamination. This can be mitigated by the introduction of through-thickness reinforcement, such as z-pins. Here, mode I & II and mixed-mode delamination tests have been designed and conducted at high loading rate, for both unpinned and Z-pinned coupons to study the effect of rate of loading. It was found that the Z-pins were not effective in delaying the dynamic crack initiation or resisting the dynamic propagation of delaminations shorter than 5 mm. However, the further growth of cracks was substantially delayed by Z-pinning, especially for the pure mode I and mode I dominated failure modes. On the other hand, the effectiveness of Z-pins in shear tests was relatively modest. The mode I dominated delamination resistance of Z-pinned laminates was found to be sensitive to the loading rate.

Publication Type: Article
Additional Information: © Elsevier 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/
Publisher Keywords: Through-thickness reinforcement, Delamination, Fracture mechanics
Subjects: H Social Sciences > HD Industries. Land use. Labor
T Technology > TJ Mechanical engineering and machinery
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Mechanical Engineering & Aeronautics
Date Deposited: 06 Sep 2019 07:47
URI: https://openaccess.city.ac.uk/id/eprint/22765
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