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

Hao Cui; Yusuf Mahadik; Stephen R Hallett; Ivana K Partridge; Giuliano Allegri; Sathiskumar A Ponnusamic; Nik Petrinic

doi:10.1016/j.compositesa.2019.105565

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

Hao Cui, Yusuf Mahadik, Stephen R Hallett, Ivana K Partridge, Giuliano Allegri, Sathiskumar A Ponnusamic, Nik Petrinic

Research output: Contribution to journal › Article (Academic Journal)

1 Citation (Scopus)

5 Downloads (Pure)

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.

Original language	English
Article number	105565
Number of pages	12
Journal	Composites Part A: Applied Science and Manufacturing
Volume	125
Early online date	1 Aug 2019
DOIs	https://doi.org/10.1016/j.compositesa.2019.105565
Publication status	Published - 1 Oct 2019

Keywords

Delamination
Fracture mechanics
Through-thickness reinforcement

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10.1016/j.compositesa.2019.105565

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

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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.",

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author = "Hao Cui and Yusuf Mahadik and Hallett, {Stephen R} and Partridge, {Ivana K} and Giuliano Allegri and Ponnusamic, {Sathiskumar A} and Nik Petrinic",

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AU - Cui, Hao

AU - Mahadik, Yusuf

AU - Hallett, Stephen R

AU - Partridge, Ivana K

AU - Allegri, Giuliano

AU - Ponnusamic, Sathiskumar A

AU - Petrinic, Nik

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AB - 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.

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