A Quantitative Evaluation of Second Order Drying Stresses

Second order drying stresses are stresses that arise from the unequal radial shrinkage potential of ray tissue and remaining tissues. Second order stresses already exist in the green wood in California black oak, presumably in the form of growth stresses. At this stage the rays are stressed in tension and the prosenchyma in compression. As drying proceeds, the stresses reverse at the fiber saturation point and the rays become stressed in compression. The point of maximum compressive stresses in the ray tissue marks the dividing line between two regions, and in the second region the compressive stresses in the ray tissue decrease as the moisture content is lowered.

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