Creep response to drying of timber boards of Scots pine

Air circulation drying of boards from Scots pine (Pinus sylvestris) causes tension stress as well as mechano-sorptive creep perpendicular to the grain. In this study we demonstrate these effects by an experimental technique based on the analysis of strain of a 3-mm-thick lamella cut from the surface of the board. The experiments showed that the creep response was different for heartwood than for sapwood. The maximum creep level was about 2 percent across the grain, reaching its maximum earlier for heartwood than for sapwood. A conditioning treatment resulted in a recovery of creep deformation, which also was shown to be closely correlated to a prong test. A regression analysis showed that not only the change in moisture content but also the previous creep level affected the mechano-sorptive creep response.

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