Measuring stress intensity factors with a camera: Integrated digital image correlation (I-DIC)

François Hild; Stéphane Roux

doi:10.1016/j.crme.2005.11.002

Measuring stress intensity factors with a camera: Integrated digital image correlation (I-DIC)

Presented by: Jean-Baptiste Leblond

François Hild ¹ ; Stéphane Roux ²

¹ LMT-Cachan, ENS de Cachan, CNRS UMR 8535, université Paris 6, 61, avenue du Président Wilson, 94235 Cachan cedex, France
² Laboratoire surface du verre et interfaces, unité mixte de recherche CNRS/Saint-Gobain, 39, quai Lucien-Lefranc, 93303 Aubervilliers cedex, France

Comptes Rendus. Mécanique, Volume 334 (2006) no. 1, pp. 8-12.

Abstract
Résumé

A novel ‘integrated’ approach coupling image correlation and elastic displacement field identification provides a powerful and accurate tool to evaluate mode I and II stress intensity factors. This technique is applied to silicon carbide subjected to a sandwiched three-point bend test, using digital pictures obtained in optical microscopy where the pixel physical scale is about 2 μm. A crack whose maximum opening is 500 nm can be detected and its geometry identified. The toughness is determined well within a 10%uncertainty.

Une nouvelle technique de corrélation d'images, dite « intégrée », est proposée. Couplée à l'identification d'un champ de déplacement d'un milieu élastique, elle permet de déterminer les facteurs d'intensité des contraintes en modes I et II. Cette technique est appliquée à un carbure de silicium lors d'un essai de préfissuration, en exploitant des images de microscopie optique dont la taille physique du pixel vaut 2 μm. Une fissure dont l'ouverture maximale est d'ordre 500 nm est identifiée et sa géométrie estimée. Les facteurs d'intensité des contraintes sont déterminés avec une incertitude bien inférieure à 10%.

Received: 2005-09-21
Accepted: 2005-11-08
Published online: 2005-12-20

DOI: 10.1016/j.crme.2005.11.002

Keywords: Rupture, Photomechanics, Brittle material, Toughness
Mots-clés : Rupture, Photomécanique, Matériau fragile, Ténacité

Author's affiliations:

François Hild ¹; Stéphane Roux ²

¹ LMT-Cachan, ENS de Cachan, CNRS UMR 8535, université Paris 6, 61, avenue du Président Wilson, 94235 Cachan cedex, France
² Laboratoire surface du verre et interfaces, unité mixte de recherche CNRS/Saint-Gobain, 39, quai Lucien-Lefranc, 93303 Aubervilliers cedex, France

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     title = {Measuring stress intensity factors with a camera: {Integrated} digital image correlation {(I-DIC)}},
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François Hild; Stéphane Roux. Measuring stress intensity factors with a camera: Integrated digital image correlation (I-DIC). Comptes Rendus. Mécanique, Volume 334 (2006) no. 1, pp. 8-12. doi : 10.1016/j.crme.2005.11.002. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2005.11.002/

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