MODELING 3-DIMENSIONAL DISTORTION OF WOOD DUE TO ANISOTROPIC SHRINKAGE

The three-dimensional distortion (warp) of wood due to anisotropic shr inkage is predicted by using an iterative computer program and a two-d imensional model for shrinkage. A previously determined analytical mod el which predicted the distorted cross-sectional shapes of lumber due to an anisotropic shrinkage was used iteratively to predict three-dime nsional distortions. An iterative procedure was used so that any log o r grain characteristics, such as sawing logs with sweep or diagonal gr ain patterns, could be investigated. Several numerical examples are pr esented to illustrate the effects of various parameters on the warping of lumber.