MODE I FRACTURE OF TROPICAL SPECIES USING THE GRID METHOD IN CONSTANT ENVIRON- MENTS: EXPERIMENTAL RESULTS
Résumé
The aim of this work is to study cracking appearance and propagation in various tropical wood of Gabon, such as Iroko (Milicia excelsa), Okume (Aucoumea klaineana) and Padouk (Pterocarpus soyauxii). In this paper, only the results obtained with Padouk are presented. An experimental device composed of wood Mixed Mode Crack Growth (MMCG) specimen combining wood sample and steel Arcan system and a Zwick press, are described. Results present the force-displacement and the forces-crack opening curves. The crack growth is obtained with the images of grid recorded by the camera during the test. Tests performed in crack opening mode (I) plane RL direction of wood are posted. The critical energy release rate is obtained versus crack by the compliance method.
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