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Two-dimensional wood drying stress simulation using control-volume mixed finite element methods (CVFEM)
Simulación bidimensional de esfuerzos de secado en la madera usando CVFEM
Keywords:
simulation, drying, wood, stress, creep, CVFEM. (en)simulación, secado, madera, esfuerzos, creep, CVFEM. (es)
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The work was aimed at simulating two-dimensional wood drying stress using the control-volume finite element method (CVFEM). Stress/strain was modeled by moisture content gradients regarding shrinkage and mechanical sorption in a cross-section of wood. CVFEM was implemented with triangular finite elements and lineal interpolation of the independent variable which were programmed in Fortran 90 language. The model was validated by contrasting results with similar ones available in the specialised literature. The present model's results came from isothermal (20ºC) drying of quaking aspen (Populus tremuloides): two-dimensional distribution of stress/strain and water content, 40, 80, 130, 190 and 260 hour drying time and evolution of normal stress ( -2,5<σxx<1,2, MPa), from the interior to the exterior of wood.
El objetivo de este trabajo es el de simular esfuerzos bidimensionales de secado usando el método de volúmenes de control conformado por elementos finitos (CVFEM). Se modelan esfuerzos de secado en una sección transversal de madera sólida, producidos por gradientes de humedad asociados a los fenómenos de contracción y sorción mecánica. En particular, se implementa CVFEM con elementos finitos triangulares, interpolación lineal de la variable independiente al interior de él y programado en lenguaje Fortran 90. El modelo se valida contrastando resultados con trabajos similares disponibles en la literatura especializada. Finalmente, se muestran resultados originales de la modelación aplicada al secado isotérmico (20 ºC) de madera sólida de álamo (Populus tremuloides): distribución bidimensional de esfuerzo/deformación y contenidos de humedad para tiempos de secado igual a 40, 80, 130, 190 y 260 (h) y evolución transitoria de esfuerzos normales ( -2,5<σxx<1.2, MPa), desde el centro a la superficie de la madera.
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Copyright (c) 2011 Carlos Salinas, Cristian Chavez, Yerko Gatica, Rubén Ananias
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