Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure

Abstract : Wood is a complex, heterogeneous and anisotropic material. Its mechanical properties are highly variable according to the species and scale considered. In order to better understand the behaviour of wood in relation to its structure, this PhD work proposes an experimental study at the tissue scale. This work is performed on several types of wood: poplar, including tension wood and spruce. Considering the small dimensions of the tested samples, a “non-contact” method is used to limit perturbations, therefore ensuring the measurement precision.The first series of measurements were realised in the three zones (tension, normal, opposite) and for the three material directions (longitudinal, radial and tangential) of an inclined poplar tree. The results obtained allowed us to compare the mechanical properties of poplar wood in all zones in relation to their microscopic features.The second series of tests were performed in the chamber of an ESEM (Environmental Scanning Electron Microscope) on hardwood (poplar) and softwood (spruce). With the images obtained during the test, from the elastic zone to the densification, the response of each type of wood to the same solicitation is presented and commented.Finally, some numerical modelling by the MPM (Material Point Method) is proposed as prospects of the present work. It will allow the mechanical behaviour of wood in large deformation to be predicted.
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Anh Tuan Dinh. Comportement élastique linéaire et non-linéaire du bois en relation avec sa structure. Sciences agricoles. AgroParisTech, 2011. Français. ⟨NNT : 2011AGPT0066⟩. ⟨pastel-00720245⟩

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