Experimental analysis reveals varying mechanosorptive creep behavior in Norway spruce, suggesting reconsideration of existing models.
Mechanosorptive creep strain (MCS) is a strain component that can dominate the overall deformation behavior of wood components under load and changing moisture. In this work, the MCS behavior of Norway spruce (picea abies) tissues is investigated for different anatomical directions perpendicular to grain and loading degrees (LD). The MCS is evaluated through a strain decomposition of the total strain, which is determined using a computer-controlled digital image correlation (DIC) system. We show that the common assumption of a scalar relation between mechanosorptive creep compliance (MCC) and the orthotropic, moisture-dependent elastic one (1) is refuted by experiments in different anatomical directions perpendicular to grain.
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Ferrara et al. (2025) studied this question.
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