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Mécanique et mécanismes de rupture dans le plan transverse du bois résineux

Abstract : This study is based on recent works developed by Simon on softwood multiscale characterisation in the transverse plane. Wood fracture behaviour is then investigated at the mesoscopic scale i.e. the growth rings scale. A satisfactory elastic model is obtained by combining digital image correlation (DIC) and numerical simulation given by the material point method NairnFEAMPM. Wood mechanical behaviour is thus assimilated to a multilayer composite material orthotropic and cylindrical. This adequate mechanical model of wood based on experimental results, observations is then applied to the investigation of softwood fracture mechanics in the transverse plane. At the mesoscopic scale, fracture mechanisms vary according to local parameters such as crack notch position into the annual ring or wood orientation in relation to the solicitation orientation. The research of fracture criteria involves measurements and estimations of local energy release rates and local critical energy release rates. Various tension tests are thus performed with the use of a specific setup. This last one helps to complete microscopic in-situ observations of fracture mechanisms and step by step fracture parameters measurements. The meshless method NairnFEAMPM combined with the CRAMP algorithm allows the numerical analysis and the implementation of local fracture criteria. The determined fracture criteria helps to predict fracture process into wood at the annual ring scale. This analysis helps to improve the knowledge of specific fracture phenomena at the mesoscopic scale such as crack bifurcation, crack arrest and secondary crack creation. Transverse wood drying analysis is then realized from experimental tests and NairnMPMFEA numerical simulation. This study gives some interesting and encouraging results as MPM tool allows crack phenomena representation under hydric solicitation.
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Submitted on : Friday, July 13, 2012 - 2:42:42 PM
Last modification on : Wednesday, July 8, 2020 - 12:42:28 PM
Long-term archiving on: : Sunday, October 14, 2012 - 2:55:38 AM


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  • HAL Id : tel-00717720, version 1


Loane Bigorgne. Mécanique et mécanismes de rupture dans le plan transverse du bois résineux. Autre. INSA de Lyon, 2011. Français. ⟨NNT : 2011ISAL0107⟩. ⟨tel-00717720⟩



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