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Vpliv značilnosti slovenskega smrekovega konstrukcijskega žaganega lesa na njegove mehanske lastnosti in prevedba sortirnih razredov v trdnostne = Influence of characteristics of stuctural sawn timber made from Slovenian spruce on its mechanical properties and assignment of visual grades to strength classes
Šega, Bogdan
Predstavljamo povezave med vizualno ugotovljenimi značilnostmi konstrukcijskega žaganega lesa izdelanega iz slovenske smrekovine (Picea abies(L.) Karst.) in njegovimi mehanskimi lastnostmi. Posušen ...žagani les smo vizualno razvrstili v sortirne razrede na podlagi SIST DIN 4074-1. Rezultate vizualnega razvrščanja smo primerjali z dobljenimi odločilnimi lastnostmi (upogibna trdnost, modul elastičnosti in gostota). Upogibna trdnost je bila najbolj odvisna od širine branike (r=-0,52), deleža grč (r=-0,50), zvitosti (r=-0,23) in oddaljenosti od stržena (r=0,12). Sortirni razred je bil najpogosteje dodeljen na podlagi ocene grč, sledijo zvitost, prisotnost stržena in širina branike. 10 % preskušancev je bilo razvrščenih v razred S13,58 % v razred S10, 15 % v razred S7, 17 % pa je bilo izločenih. Ugotovljene karakteristične vrednosti sortirnih razredov S13, S10 in S7 so bile višje od zahtev SIST EN 338 za trdnostne razrede C30, C24 oz. C18. Rezultati raziskave predstavljajo osnovo, na podlagi katere bo omogočeno prevajanje sortirnih razredov v trdnostne.
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