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The aim of this study was to evaluate the full-field swelling and shrinkage strains on the earlywood (EW) and latewood (LW) bands of juvenile and mature woods in jack pine. Moisture-induced strains in the tangential (ε xx ) and radial (ε yy ) directions were assessed by a 3D digital image correlation device composed of two high-resolution stereo-vision cameras on the cross-section of wood samples. The accuracy of strain measurements was verified by comparison with the conventional swelling/shrinkage coefficients. Matched samples were used to compare the growth ring strains with the radial density profiles of juvenile and mature woods. The results showed that swelling and shrinkage ε xx  differed between juvenile and mature woods, for both EW and LW. Moreover, the shrinkage ε yy  of EW differed from that of LW for both wood types. A significant interaction between wood type and EW-LW bands was found for swelling ε yy , which was lower in EW and higher in LW of juvenile wood than of mature wood. Regression models revealed that swelling/shrinkage ε yy  is more governed by growth ring features (width, density, and proportion of EW and LW) than ε xx . Better correlations were obtained to predict ε yy  in juvenile wood than for mature wood.

Moisture-induced strains in earlywood and latewood of mature and juvenile woods in jack pine from 3D-DIC measurements