Impact damage resistance and tolerance of Z-pinned composite laminates

Luca Francesconi
Primo
;
Francesco Aymerich
Ultimo
2020

Abstract

The study examines the effect of Z-pinning on the impact and post-impact behaviour of composite laminates. Unpinned and Z-pinned [02/902]s and [0/±45/90]s carbon/epoxy samples were subjected to low-velocity impacts inducing damage states ranging from barely visible damage to full penetration and subsequently tested in compression to examine the influence of Z-pinning on the resistance and tolerance to impact damage. The fracture modes induced by impact and the damage mechanisms controlling the residual compressive properties of the laminates were examined by radiographic and visual inspections. It was found that Z-pinning does not improve the resistance of the laminates to the initiation of delamination under impact loadings. However, Z-pinning enhances the resistance to delamination growth and improves the residual compressive strength of the laminates for impacts of sufficiently high energy. The beneficial effect of Z-pins may be attributed to their bridging action across delaminated interfaces, which reduces the delamination driving force and improves the resistance to local buckling under compressive loads.
Inglese
ECCM 2018 - 18th European Conference on Composite Materials
8
18th European Conference on Composite Materials, ECCM 2018
Contributo
Esperti anonimi
24th-28th June 2018
Atene, Grecia
internazionale
scientifica
Z-pinning; Impact; Compression After Impact (CAI); Damage
no
4 Contributo in Atti di Convegno (Proceeding)::4.1 Contributo in Atti di convegno
Francesconi, Luca; Loi, Gabriela; Aymerich, Francesco
273
3
4.1 Contributo in Atti di convegno
reserved
info:eu-repo/semantics/conferencePaper
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