New Method of Calculating Internal Stresses in Wood

A method for calculating the perpendicular-to-grain normal and shear stresses at any point in the cross section of a board is described. The method can be applied to hoards at any stage of drying. Measurements are made on thin slices cut parallel to the face of the board. The technique was applied to determine drying stress perpendicular to the grain in a 2- by 7-inch flat-sawed plank of northern red oak being dried from the green condition. The information derived gives a much clearer insight into the stress behavior of drying wood than has heretofore been possible.

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