RESULTS AND DISCUSSION
Bending properties
The most important mechanical properties of OSB are MOR and MOE, these
properties are an indication of the overall board quality. Average MOR and MOE
values for all panel types from dry and wet condition bending tests are shown in Table
1. The effect of strand orientation on MOR of OSB, comparing the mean values, for all
types is shown in Figure 1. The MOR of UD board was highest in the parallel direction,
whereas it was lowest in the perpendicular direction. The bending properties (MOR and
MOE) in the parallel direction of three-layer boards (OC and OR) revealed no
significant difference, which could be due to the fact that the surface layer properties
dominated the bending properties of the board. On the other hand, the strength in the
perpendicular direction of the OC board was slightly higher than that of the OR board,
which may be attributed to the high strength of the aligned core layer of the crossoriented
board. The MOE obtained under the same conditions as MOR is shown in
Figure 2.