Investigation of OSB Thickness-Swell Based on a 3d Density Distribution. Part I. The Finite Element Model


  • Alan D. Tackie
  • Siqun Wang
  • Richard M. Bennett
  • Sheldon Q. Shi


Thickness-swell, OSB, modeling, density distribution, VDP, HDD


A finite element model was developed for predicting thickness-swell of oriented strandboard. The model accounts for both vertical and horizontal density variations of the board, or the three-dimensional density distribution. Density variation, resulting from manufacturing processes such as strand orientation and pressing cycles, affects the uniformity of thickness-swell in OSB. The model uses nonlinear constitutive behavior in the through-the-thickness direction. Moisture changes were modeled using transient moisture transfer equations and coupled moisture-density-stress-strain relations. The model was used to predict thickness-swell during a 24-h soak test. The model was able to predict average thicknes-swell of commercial panels with an acceptable error, generally less than 10%.


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