Contribution to investigation of influence of some factors on impact bending of some important commercial wood species

Investigations in this field relate to testing the influence of the specific gravity of wood and the different moisture content on impact bending. The complexity of such features and influences of the mentioned factors is reflected in the results of such work. Conclusions and explanations that arose from them for poplar, basswood, pine, oak, beech, and hornbeam are the following:

- Impact bending of partly dried wood is increased by the enlargement of its specific gravity (picture 1).
- The influence of the moisture content in wood on impact bending cannot be expressed unambiguously for all species of wood; it is distinctively dependent on the wood species.
- Difficulties in the size of impact bending among some humidity states of wood for individual species are statistically significant (poplar, pine, oak, beech - tables 3 and 4, pict. 2). For basswood and hornbeam, these differences are not statistically significant.
- Diversity in showing impact bending with regard to wood species and humidity state probably appears as a consequence of the physical basis of wood nature upon interaction with a certain quantity of accepted, i.e., remained-over water. The established state has been specific for individual wood species.