In total, 18 trees (three trees for each clone) were selected on the basis of stem form, health condition, and D (with mean values) for measuring wood properties, such as basic density (BD), microfibril angle (MFA) of wood fibers, radial and tangential shrinkages
per 1 percent change in moisture content (RS and TS, respectively), compressive strength parallel to grain (CS), modulus of elasticity (MOE), and modulus of rupture (MOR).
Wide, flat-sawn boards will cup as they dry because one side of the board has more tangential shrinkage
than the other, due to the curving growth rings (Fig.
Significant positive correlations between radial and tangential shrinkages
and BD were found.
[[alpha].sub.t] = tangential shrinkage
In practice, due to practicality and simplicity, the coefficient of tangential shrinkage
must be taken into consideration when determining the net sawn board thickness, regardless of the sawn board's grain according to Equations 11 and 12.
Characterization of tangential shrinkage
stresses of wood during drying under superheated steam above 100[degrees]C.
This can be further explained by the significantly increased shrinkages (tangential shrinkage
for the loaded LR specimen and radial shrinkage for the loaded LT specimen) in the loading direction (Figs.
The 7.2 percent mean tangential shrinkage
from green to ovendry of the three subalpine fir trees was similar to the 7.4 percent reported in the Wood Handbook.
The relationships between tangential shrinkage
stresses and moisture content change at various RHs from high-temperature saturated steam drying were significantly different from those of the radial stresses reported in an early study.