The flexural creep behaviour of oriented strandboards OSB/3 10 mm thick was investigated for a period of 72 days. The samples divided into two series were loaded in the plane of the panel in 4-point bending under four stress levels: 30, 40, 50 and 60% of MOR (modulus of rupture). Values of rheological constants were calculated using the 3-element rheological model. Deflections increased about linearly with respect to stress level up to 50% of MOR. The creep process of samples tested at stress level of 60% of MOR was rather nonlinear. Many samples tested at this stress level failed before the experiment was completed.
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