Secondary Crack Formation as Fracture Mechanism in Nanocomposites of Epoxy and Fullerene-Like WS2

Haba, D.; Barbezat, M.; Brunner, A.J.

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Title	Secondary Crack Formation as Fracture Mechanism in Nanocomposites of Epoxy and Fullerene-Like WS2
Authors	Haba, D. Barbezat, M. Brunner, A.J.
ORCID
Keywords	polymer fullerene-like WS2 nanoparticles nanocomposite epoxy fracture mechanics atomicforce microscopy (AFM)
Type	Conference Papers
Date of Issue	2015
URI	http://essuir.sumdu.edu.ua/handle/123456789/42488
Publisher	Sumy State University
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Citation	Haba, D. Secondary Crack Formation as Fracture Mechanism in Nanocomposites of Epoxy and Fullerene-Like WS2 [Текст] / D. Haba, M. Barbezat, A.J. Brunner // Nanomaterials: Applications & Properties (NAP-2015) : Proceedings of the International Conference. — Sumy : Sumy State University, 2015. — V.4, No2. — 02NNSA03.
Abstract	Fullerene-like WS2 (IF-WS2) nanoparticles (NPs) were used as a toughening agent in epoxy nanocomposites. Already 0.5 % IF-WS2 by mass increased the critical energy release rate GIc by 45 % to 62 %. Conicsection-shaped crack lines were observed on the fracture surfaces in some distance to the NPs. Nanomechanical AFM modulus measurements showed, however, no measurable differences between the modulus distribution in the vicinity of the NPs and the bulk epoxy. Possible secondary crack formation at the NPs explains the crack lines nicely. The crack line geometry allows determining the relative velocity of the secondary crack. Topographic AFM showed vertical steps several hundred nanometers high at the crack lines, indicating shear fracture and suggesting the presence of numerous subsurface cracks, which might explain the toughness increase.
Appears in Collections:	Наукові видання (ЕлІТ)