Linear Expansion of Wood Composites: A Model
Keywords:
Linear expansion, model, Monte Carlo simulation, orientation, oriented strandboard, particleboard, wood compositesAbstract
An analytical model was developed to better understand and predict linear expansion of wood composite panels. The model analysis was based on the assumption of elasticity and of uniform directional distribution of linear expansion. Monte Carlo simulation of the model required inputs of modulus of elasticity of solid wood, linear expansion values of solid wood, particle size distribution, and orientation distribution of particles.
The simulation showed, as expected, that lower density wood species resulted in lower linear expansion of the composite panel. In single-layer oriented strandboard, linear expansion in the orientation direction decreased gradually as percent alignment increased, but increased rapidly across the orientation direction especially when percent alignment exceeded 40-60%.
Finally, simulation results were compared with the results of experimental linear expansion studies drawn from the literature. The agreement was encouraging.
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