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DOI : 10.1023/B:FRAC.0000021076.76987.62

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International Journal of Fracture 125 (2004) 171-187

A Method to Determine the Macroscopic Toughness Scatter of Brittle Materials

Pascal Forquin 1, 2, Laurent Rota 1, Yann Charles 2, François Hild 2

(2004)

An experimental procedure is developed to determine the scatter of the macroscopic toughness of brittle materials. First, samples are precracked to obtain a sharp precrack. The toughness is then determined by using a standard three-point flexural test. Digital image correlation is used to analyze displacement fields of cracked samples. Based upon the resolution and the spatial resolution of the measurement technique, a detection criterion is proposed and validated. It allows for an accurate estimate of the crack tip location so that the presence of a crack and its size at arrest can be monitored. As an example, the toughness distribution of 18 samples made of silicon carbide is evaluated. By using a simple macro-micro transition, an analysis of the scatter in toughness is related to that in strength for the material with no macrocracks.

1 :	Centre Technique d'Arcueil (CTA)
	DGA
2 :	Laboratoire de Mécanique et Technologie (LMT)
	CNRS : UMR8535 – Université Pierre et Marie Curie [UPMC] - Paris VI – École normale supérieure de Cachan - ENS Cachan

Domaine

:

Physique/Mécanique/Mécanique des matériaux Sciences de l'ingénieur/Mécanique/Mécanique des matériaux

Mots Clés : Crack opening displacement – Digital image correlation – Probabilities and statistics – Sandwiched-beam technique – SiC ceramic – Single-edge notched beam

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Contributeur : François Hild <>

Soumis le : Lundi 20 Septembre 2004, 18:21:20

Dernière modification le : Mardi 16 Septembre 2008, 22:33:35