Effect of stitching on the low-velocity impact response of [0 3/90 3] s graphite/epoxy laminates

This study examines the effect of stitching on the impact performance of a class of graphite/epoxy cross-ply laminates with the aim of investigating the ability of through-thickness reinforcement to improve the delamination resistance of laminates. Unstitched and stitched rectangular specimens (65 m...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2007-04, Vol.38 (4), p.1174-1182
Main Authors: Aymerich, F., Pani, C., Priolo, P.
Format: Article
Language:English
Subjects:
A. Carbon fibre
Applied sciences
B. Delamination
B. Impact behaviour
E. Stitching
Exact sciences and technology
Forms of application and semi-finished materials
Laminates
Polymer industry, paints, wood
Technology of polymers
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Summary:This study examines the effect of stitching on the impact performance of a class of graphite/epoxy cross-ply laminates with the aim of investigating the ability of through-thickness reinforcement to improve the delamination resistance of laminates. Unstitched and stitched rectangular specimens (65 mm × 87.5 mm) were simply supported by a steel plate having a rectangular opening 45 mm × 67.5 mm in size and impacted at the center with energies ranging between 1 and 13 J. Stitched and unstitched laminates revealed similar structural performances in terms of force versus displacement response, energy absorption and residual indentation depth. It was also observed that whereas stitching does not appear capable of preventing the initiation and spread of delaminations, it induces a clear reduction of damage area when stitches bridge delaminations sufficiently developed in length.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2006.06.005