A Method to Determine the Macroscopic Toughness Scatter of Brittle Materials

Abstract : 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.
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https://hal.archives-ouvertes.fr/hal-00002912
Contributor : François Hild <>
Submitted on : Monday, September 20, 2004 - 6:21:20 PM
Last modification on : Thursday, July 25, 2019 - 2:58:08 PM
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Pascal Forquin, Laurent Rota, Yann Charles, François Hild. A Method to Determine the Macroscopic Toughness Scatter of Brittle Materials. International Journal of Fracture, Springer Verlag, 2004, 125, pp.171-187. ⟨10.1023/B:FRAC.0000021076.76987.62⟩. ⟨hal-00002912⟩

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