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Effect of mendable polymer stitch density on the toughening and healing of delamination cracks in carbon-epoxy laminates

journal contribution
posted on 01.04.2013, 00:00 authored by K Pingkarawat, C H Wang, Russell VarleyRussell Varley, A P Mouritz
This paper presents an investigation into the effect of stitch density on the delamination toughening and self-healing properties of carbon–epoxy laminates. The stitches provide the laminate with the synergistic
combination of high mode I interlaminar fracture toughness to resist delamination cracking and healing properties to repair delamination damage. The results show that the fracture toughness of the laminate
increased with stitch density, due to higher traction (crack closure) loads exerted by the stitches bridging the delamination. During the healing process these bridging stitches first melt and then flow into the
delamination, leading to self-healing with full restoration of the mode I fracture toughness. Furthermore, the stitches were capable of repairing delamination cracks many times larger than the original size of the
stitches. The effect of stitch density on the healing process of delamination cracks and restoration of fracture toughness was found to remain approximately the same under multiple repair operations.

History

Journal

Composites Part A: Applied Science and Manufacturing

Volume

50

Pagination

22 - 30

Publisher

Elsevier

Location

United Kingdom

ISSN

1359-835X

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2013 Elsevier