The effect on the mechanical properties of carbon/epoxy composites of polyamide coatings on the fibers

Varelidis, PC; McCullough, RL; Papaspyrides, CD

dc.contributor.author	Varelidis, PC	en
dc.contributor.author	McCullough, RL	en
dc.contributor.author	Papaspyrides, CD	en
dc.date.accessioned	2014-03-01T01:15:19Z
dc.date.available	2014-03-01T01:15:19Z
dc.date.issued	1999	en
dc.identifier.issn	0266-3538	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13427
dc.subject	A. Carbon fibers	en
dc.subject	Adhesion	en
dc.subject	Mode I fracture toughness	en
dc.subject	Polyamide coating	en
dc.subject.classification	Materials Science, Composites	en
dc.subject.other	Cantilever beams	en
dc.subject.other	Composite structures	en
dc.subject.other	Crack propagation	en
dc.subject.other	Delamination	en
dc.subject.other	Epoxy resins	en
dc.subject.other	Fracture toughness	en
dc.subject.other	Microstructure	en
dc.subject.other	Morphology	en
dc.subject.other	Plastic coatings	en
dc.subject.other	Polyamides	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Thermogravimetric analysis	en
dc.subject.other	Double-cantilever beam (DCB) test	en
dc.subject.other	Carbon fiber reinforced plastics	en
dc.subject.other	carbon fiber	en
dc.subject.other	coating	en
dc.subject.other	fracture toughness	en
dc.subject.other	polyamide	en
dc.subject.other	carbon fiber	en
dc.subject.other	coatings	en
dc.subject.other	fiber reinforced composite	en
dc.subject.other	mechanical property	en
dc.subject.other	polyamide	en
dc.subject.other	testing	en
dc.title	The effect on the mechanical properties of carbon/epoxy composites of polyamide coatings on the fibers	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0266-3538(99)00039-1	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0266-3538(99)00039-1	en
heal.language	English	en
heal.publicationDate	1999	en
heal.abstract	An experimental investigation has been carried out to study the effect of polyamide coatings on the mechanical properties of unidirectional carbon/epoxy composites. Carbon fibers were coated with polyamide 6,6 by means of interfacial polyamidation and solution dip coating in a laboratory-scale unit developed for this purpose. The amount of coating deposited on the fibers was determined by thermogravimetric analysis (TGA); the morphology and microscale homogeneity were examined by scanning electron microscopy (SEM). Transverse tensile tests and short-beam shear tests were performed in order to assess the effect of the coating on the adhesion of the fiber to the matrix. Composites containing solution-coated fibers exhibited improved tensile and ILSS performance over those of uncoated-fiber composites, although interfacial coating induced deterioration in performance. The double-cantilever beam (DCB) test was used to investigate the effect of the two different polyamide fiber-surface coatings on mode I interlaminar fracture toughness. Initiation fracture toughness (G(IC init)) increases for both polyamide coatings. Moreover, interfacial coating causes extensive fiber bridging leading to much increased propagation values. The mechanical results are attributed to the different nature of the two polyamide coatings and to differences in the microstructure of the resulting composites.An experimental investigation has been carried out to study the effect of polyamide coatings on the mechanical properties of unidirectional carbon/epoxy composites. Carbon fibers were coated with polyamide 6,6 by means of interfacial polyamidation and solution dip coating in a laboratory-scale unit developed for this purpose. The amount of coating deposited on the fibers was determined by thermogravimetric analysis (TGA); the morphology and microscale homogeneity were examined by scanning electron microscopy (SEM). Transverse tensile tests and short-beam shear tests were performed in order to assess the effect of the coating on the adhesion of the fiber to the matrix. Composites containing solution-coated fibers exhibited improved tensile and ILSS performance over those of uncoated-fiber composites, although interfacial coating induced deterioration in performance. The double-cantilever beam (DCB) test was used to investigate the effect of the two different polyamide fiber-surface coatings on mode I interlaminar fracture toughness. Initiation fracture toughness (GICinit) increases for both polyamide coatings. Moreover, interfacial coating causes extensive fiber bridging leading to much increased propagation values. The mechanical results are attributed to the different nature of the two polyamide coatings and to differences in the microstructure of the resulting composites.	en
heal.publisher	Elsevier Science Ltd, Exeter, United Kingdom	en
heal.journalName	Composites Science and Technology	en
dc.identifier.doi	10.1016/S0266-3538(99)00039-1	en
dc.identifier.isi	ISI:000082561700004	en
dc.identifier.volume	59	en
dc.identifier.issue	12	en
dc.identifier.spage	1813	en
dc.identifier.epage	1823	en