CHAPLAIN, Myriam; DETHAN, Thibault; CASTERA, Patrick

Institut de Mécanique et d'Ingénierie [I2M]

DETHAN, Thibault

CASTERA, Patrick

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Communication dans un congrès avec actes

Ce document a été publié dans

WCTE : Conference Proceedings, 9th World Conference on Timber Engineering - (WCTE) -, 2006-08-06, Portland. 2006

Résumé en anglais

For fracture caused by stress concentrations in beams, a crack is often at the origin of final rupture. When air humidity variations occur, the small area around the crack tip (process zone), under high stresses is also directly submitted to these variations, which generally decrease the strength of the beam. To emphasize this phenomenon, crack growth tests are carried out under opening mode along the grain direction on modified Tapered double Cantilever Beams. The tests are realised in a climate room allowing variations of relative humidity. It has been found that air-drying gives a high increase of the crack velocity while air wetting gives a smaller increase. The effects of natural climate variation on crack propagation and on time to failure of notched beams under constant loading are also studies. The phenomenon is modelling by non linear fracture mechanics assuming that only process zone is sensitive to fast variations of relative humidity. Correct trend of experiments is obtained.< Réduire

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https://oskar-bordeaux.fr/handle/20.500.12278/124338

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Institut de Mécanique et d’Ingénierie de Bordeaux (I2M) - UMR 5295

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Effects of climatic conditions changes on crack growth

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Résumé en anglais

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Unités de recherche