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Modelling the behavior of Wood with knots at macroscale
Research Areas
  • Civil engineering and architecture
In this research it is proposed a 3D material model for simulating the behavior of wood at macroscale when considering the effect of the mesoscale in terms of the knots and grain deviation. The fibre deviation was estimated by applying the theory of the flow-grain analogy in 3D around the real complex shape of the knots, and regardless of the finite element mesh. This was allowed by enforcing the pass of a laminar flow through a pipe which completely enveloped the structural piece of study. By rotating this pipe 3 times around the axes of the piece it was possible to consider the global deviation in faces and edges, aside from the position of the LT plane. Any shape of knot, combination of knots, and position can be simulated with the presented methodology. In addition an anisotropic plasticity model, and several phenomenological failure criteria applied according the average stress approach, were considered. The model was validated by comparing the position and load of failure in common 4 point bending tests, and also by comparing a wide field of displacements which where measuring by digital image correlation (DIC). It was obtained an accuracy in failure prediction up to 5%, so that this heterogeneous finite element approach seems to be an adequate tool for progressively integrating various scales, and simulate the complex behavior of wood.
Euopean Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)
Viena, Austria
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Proceedings of Euopean Congress on Computational Methods in Applied Sciences and Engineering (ECCOMAS 2012)
  • Autor: P. Guindos (Univ. Santiago de Compostela)
  • Autor: Manuel Guaita Fernández (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Construcción con Madera
  • Departamento: Construcción y Vías Rurales
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