In addition, the generated triangular specimen has three surfaces that can be glued together once converted to glue-line elements: two radial surfaces and one tangential surface
, which gives more flexibility in manufacturing.
Other studies have compared calibrations based on radial and tangential surface
Due to the effect of the tangential surface
tension, the internal and external pressures at the crest and trough interface become asymmetrical.
A 10-mm steel ball with an accuracy of 0.001 mm was applied on the cross section (i.e., longitudinal direction), radial surface (i.e., tangential direction), and tangential surface
(i.e., radial direction), respectively.
Roughness values of the radial surface were also determined to be slightly higher than that of the tangential surface
, as can be seen in Table 2.
The load was applied through the bearing block to the tangential surface
nearest to the pith.
[L.sup.*][a.sup.*][b.sup.*] color values of tangential surface
earlywood and latewood were measured with the Minolta CR-10 colorimeter.
As a result, surface checks from wood drying are more evident on the tangential surface
(Wu and Milota 1995).
The tangential surface
to be densified was the side close to the bark.
The relatively poor predictions obtained from NIR spectra from the tangential surface
may be due to the fact that the scanned surface (a 3/4-inch-diameter spot, in this case) may be only either earlywood or latewood.
Therefore, instead of cutting grooves, holes with the diameter of 1 mm were cut on the tangential surface
of the plate at an interval of 20 mm.
In this study the tangential surface
was not examined because it does not represent all of the wood property variation present in a short clear wood sample.