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Bendability of Thermally Modified Oak (Quercus robur F)

Thermally modified wood is increasingly used as a structural element in wooden buildings. Depending on the use of the material, different material characteristics that are telling of the bendability of the material can be used. Important characteristics include the force at the limit of proportionality FE, the deflection at the limit of proportionality YE, the force at the modulus of rupture FP and the deflection at the modulus of rupture YP. Since the flexibility also depends on the thickness of the material, it is appropriate to express the bendability by a ratio of the thickness of the material to the smallest achievable bend radius. In the research we used an analysis of the properties, using characteristics determining the minimum bend radius Rmin and the coefficient of bendability Koh. These characteristics were determined for thermally modified oak wood (Quercus robur F), focusing on determining the effect of the different temperatures used in the thermal modification (160, 180, 210 °C). The results measured in these test specimens were compared with the results measured in a set of test specimens not subjected to thermal modification (20 °C). To identify these material characteristics, software developed by us for accurately determining boundary points in force-deformation diagrams obtained during measurement was used. In this article we present a part of the research results, which resulted in new knowledge about the bendability of oak wood thermally modified at different temperatures.

Coefficient of bendability, Deflection at the limit of proportionality, Force at the limit of proportionality, Force at the modulus of rupture, Minimum bend radius

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