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Titolo:
Thermal degradation of the mode I interlaminar fracture properties of stitched glass fibre vinyl ester composites
Autore:
Watt, A; Goodwin, AA; Mouritz, AP;
Indirizzi:
Dept Def, DSTO, Aeronaut & Maritime Res Lab, Melbourne, Vic 3001, Australia Dept Def Melbourne Vic Australia 3001 Lab, Melbourne, Vic 3001, Australia Monash Univ, Dept Mat Engn, Melbourne, Vic 3168, Australia Monash Univ Melbourne Vic Australia 3168 , Melbourne, Vic 3168, Australia
Titolo Testata:
JOURNAL OF MATERIALS SCIENCE
fascicolo: 10, volume: 33, anno: 1998,
pagine: 2629 - 2638
SICI:
0022-2461(19980515)33:10<2629:TDOTMI>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
FIBER; TOUGHNESS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
--discip_EC--
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Mouritz, AP Dept Def, DSTO, Aeronaut & Maritime Res Lab, POB 4331, Melbourne, Vic 3001, Dept Def POB 4331 Melbourne Vic Australia 3001 urne, Vic 3001,
Citazione:
A. Watt et al., "Thermal degradation of the mode I interlaminar fracture properties of stitched glass fibre vinyl ester composites", J MATER SCI, 33(10), 1998, pp. 2629-2638

Abstract

Changes to the Mode I interlaminar fracture toughness, G(Ic) and fracture mechanisms of stitched and unstitched fibreglass/vinyl ester composites were investigated after exposure to elevated temperatures. The fibreglass was stitched th rough the thickness with Kevlar(R)-49 thread in two orientations with two stitch densities, and then resin transfer moulded with a cold-curing vinyl ester resin. After curing at room temperature (similar to 20 degrees C) for several weeks, the composites were heated to between 100 and 300 degrees C for 1 h or at 175 degrees C for times ranging from 0.25-100 h. The G(Ic) values, which were measured using the double cantilever beam method, of stitched composites in the cold-cured condition were between 1.5 and2.3 times higher than the unstitched composite. It was observed with scanning electron microscopy that th is toughening occurred by deflection of thecrack tip at the stitches, by the ability of the stitches to remain intactfor a short distance (7-15 mm) behind the crack front, a nd by partial pull-out of broken stitches. The interlaminar fracture toughness of the unstitched composite increased slightly following heating, despite a possible breakdown of the chem ica I structure of the vinyl ester between 150 and 300 degrees C. In contrast, the interlaminar toughness of the stitched composites was degraded significantly by heating, and this was probably caused by thermal deterioration of the Kevlar(R) stitches. This study reveals that the elevated-temperature post-curing of stitched composites will reduce the effectiveness of Kevlar(R) stitching in raising the Mode I interlaminar fracture toughness. (C) 1998 Chapman & Hall.

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Documento generato il 27/09/20 alle ore 22:56:57