TAILIEUCHUNG - Báo cáo lâm nghiệp: "Simulation of wood deformation processes in drying and other types of environmental loading*"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: "Simulation of wood deformation processes in drying and other types of environmental loading. | Ann Sci For 1996 53 857-866 Elsevier INRA 857 Original article Simulation of wood deformation processes in drying and other types of environmental loading o Dahlblom s Ormarsson H Petersson Division of Structural Mechanics Lund University Box 118 S-22100 Lund Sweden Received 3 October 1994 accepted 19 October 1995 Summary - Deformation processes in wood exposed to drying and other types of environmental loading are simulated by use of the finite element method. In the material model applied the orthotropic structure of the wood material is considered. The differences of properties in the longitudinal radial and tangential directions for stiffness parameters as well as for moisture shrinkage parameters are taken into account. As an illustration of possible application areas the deformation development of boards during drying is simulated. In the analyses the influence of spiral grain and the variation of wood properties with the distance from the pith are considered. The simulation yields information about unfavourable deformations that develop during the drying process. simulation deformation wood moisture finite element method Resume - Simulation du processus de deformation du bois par séchage et autres types de charges environnementales. Le processus de deformation du bois expose au séchage et autres types de charges environnementales est simulé par la methode des elements finis. La structure orthotropique du bois est prise en consideration sur le modèle de materiel utilise. Les differences existant au niveau des propriétés des directions longitudinales radiales et tangentielles sont prises en compte pour les paramètres de rigidité et de contraction par humidité. Une des possibilités du champ d applications est illustrée par le fait que revolution de la deformation des planches pendant le séchage est simulée. À echelon des analyses influence du grain spiral et la variation des propriétés du bois avec la distance depuis la moelle sont pris en compte. La simulation

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