Combining X-ray CT and DIC to understand the bending strength of OSB

Oriented strand board (OSB) is an important engineered wood product manufactured through bonding of strands in cross-oriented layers. The bending strength, one the crucial properties for loadbearing material, OSB strongly depends on its structural characteristics. To understand strength OSB, strain distribution was continuously monitored during a three-point test using digital image correlation (DIC) and internal structure recorded before after X-ray computed tomography (X-ray CT) respectively. Specimens were cut either along length (L specimens) or width (W panels. For all specimens, accumulation mainly seemed to occur top bottom layers then propagate across central layer. Structural changes L specimens delamination snap off, while only off found W specimens. This main reason high modulus elasticity (MOE) rupture (MOR) comparison High MOR attributed propagation layer, which can absorb energy from loading. Strain layer causes low MOR, resulting failure small Different modes change lead large variability MOE, deformation even single panel. Understanding contributes optimizing production application OSB.