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The role of shear stress in the bending strength test of short and medium length specimens of clear wood

Koczan G., Kozakiewicz P.

Drewno : prace naukowe, doniesienia, komunikaty

2017

vol. 60, nr 199

161--175

The process of wood bending displays measurable departures from the standard beam theory. The most well-known departures are caused by shear. In the mathematical part of this work we found and analysed full plane stress of wood which occur in III-point and IV-point loading. Hill-type strength criteria have been used. The role of shear is determined by the relation between shear spandepth ratio and bending-shear strength ratio. Three types of this relation have been defined, one of which specifies the concept of medium length beam. In the second part of this work we statistically described bending-shear strength ratio for European, American and exotic wood species. On this basis, we determined the shear span-depth ratio of the medium beam. The role of shear stress in the bending strength test of medium beam cannot be omitted. The work contains elements of strength theory from a historical perspective, especially concerning strength criteria. Given one result of the contact mechanics.