Matti Kärkkäinen 
,
Herman Hakala
Kuusitukin koon vaikutus sivulautojen taivutus- ja puristuslujuuteen.
Kärkkäinen M., Hakala H. (1983). Kuusitukin koon vaikutus sivulautojen taivutus- ja puristuslujuuteen. Silva Fennica vol. 17 no. 2 article id 5182. https://doi.org/10.14214/sf.a15098
English title: Effect of log size on the bending and compression strength of side boards in Norway spruceAbstract
In order to evaluate the strength properties of boards made from small and large Norway spruce (Picea abies) butt logs, 15 small (top end diameter 13 cm) and 15 large (top end diameter 25 cm) logs were sampled from a sawmill in Finland. From each log two test pieces were made in order to measure the bending and compression strength, dry density and average ring width.
The boards from small logs were stronger and their density higher. When the differences between groups were analysed it was found that the strength was determined by the density and ring width. When the density was kept constant, the increase in ring width had a decreasing effect on the strength properties. Because there was a negative correlation between ring width and density, ring width alone had a great effect on the strength properties.
The PDF includes a summary in English.
Original keywords
kuusi;
sahatavara;
kuusitukki;
puuaineen tiheys;
vuosiluston leveys;
taivutuslujuus;
pintalauta;
puristuslujuus
English keywords
saw logs;
ring width;
density;
sawn goods;
bending strength;
log size;
compression strength;
side board
Published in 1983
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Available at https://doi.org/10.14214/sf.a15098 | Download PDF
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