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Étude et modélisation du comportement en compression du bois sous sollicitations d'impacts

Abstract : Wood is a natural cellular material, which is widely and advantageously used as shock absorber for the transport of radioactive materials. Accident situations are evaluated based on the 9 m drop test, which allows us to observe the complex crushing behavior of wood. A compressive experimental study is conducted on spruce and beech wood species over a large range of strain rates (from 0.001 to 600 s−1) to investigate the effect of the loading direction and of two extreme lateral confinements. The longitudinal direction is the most sensitive to the effect of strain rate and of lateral confinements which have significant consequences on the energy absorption. Besides, the experimental investigation can be adapted to various wood species with very different mechanical properties. A strain rate dependent elastoplastic model with transversal isotropy is developed using multi-scale and micromechanics techniques. The elastic macroscopic properties of wood are estimated with a Mori-Tanaka scheme and information extracted from the microstructure. The Gurson type criterion based on the micromechanical approach of the ductile damage is used in order to describe the non linear behavior of wood, its densification regime and its compressibility as well. Additionally, uncoupled degradation parameters are applied to reproduce the failure mechanisms involved in the longitudinal response. A simplified description of wood is used within the modeling and the numerical results exhibit the good ability of the model to reproduce the various wood responses during an accident situation.
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Submitted on : Tuesday, October 5, 2021 - 1:45:26 PM
Last modification on : Wednesday, October 6, 2021 - 3:36:15 AM

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  • HAL Id : tel-03365803, version 1

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Jérémy Wouts. Étude et modélisation du comportement en compression du bois sous sollicitations d'impacts. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2017. Français. ⟨NNT : 2017VALE0025⟩. ⟨tel-03365803⟩

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