DIGITALNA ARHIVA ŠUMARSKOG LISTA
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| ŠUMARSKI LIST 9-10/2019 str. 45 <-- 45 --> PDF |
3131:1999. Brinell hardness was tested on “Shimadzu AG-X 100kN”, universal machine for testing the mechanical properties of wood, with test load for hardwood species (1000 N) and a 10 mm diameter indenter. Statistical analysis of the results and their comparison was carried out in specialized statistical program Statistica 8. Statistical analysis has shown the number of measured samples, minimal, maximal and average value of certain measured properties, standard deviation, as well as their coefficient of variation. Comparison study between investigated Brinell hardness of beech and hornbeam wood was carried out by Mann Whitney test. RESULTS AND DISCUSSION REZULTATI I RASPRAVA Invesigated Brinell hardness of thermally modified beech wood is lower than unmodified beech wood on all three sections. Average Brinell hardness of thermally modified beech wood was lower for 3% on cross section, it was lower for 15% on radial section and it was lower for 25% on tangential section (Table 1). Statistical analysis showed there is sigifficant difference between Brinell hardness of thermally modified and unmodified beech wood on all three sections (Table 2 and Figure 2). |