Figure 4
The column (a) is with samples showing highest mechanical strength. The break line is not so evident on longitudinal side. In the column (b), the typical rupture at compression strength of the most samples. In (b2) and (b3) it is evident a split in the tissues. In (b4) there is an overlapping of radial size in the cross-cut side due to compression stress. In (b5) the rupture of (b3) is located at the end of ring width in the transition from latewood to the earlywood of the next ring. The rupture in (c1) is in the less resistant specimen, the cleavage break occurs in the cell walls of latewood vessels and it is in specimen with more gradual transition from the ring porous to latewood vessels.
