Vpliv vlažnosti in temperature na modul elastičnosti LVL = Impact of moisture content and temperature on the modulus of elasticity of LVL
Šernek, Milan ; Straže, Aleš ; Resnik, Jože, 1942-
Opisana je raziskava vpliva vlažnosti in temperature na modul elastičnosti (MOE) lameliranega furnirnega lesa (LVL). V eksperimentu je bil uporabljen LVL, ki je bil s fenolformaldehidnim lepilom ...zlepljen iz 13 slojev bukovega luščenega furnirja (Fagus silvatica L.) imenske debeline 3,2 mm. Furnirni listi so bili vzdolžno spojeni s poševnim spojem. Iz LVL je bilo lzdelanih 40 preizkušancev dimenzij b x h x l = 40 x 40 x 830 mm za testiranje MOE pri upogibu po ploskvi in po robu. Preizkušanci so bili razdeljeni v štiri vlažnostne skupine A, B, C, in D, ki so bile pri preizkušanju segrete na pet temperatur : -20, 0, 20, 40 in 60 ▫$^o C$▫. Ugotovljeno je bilo, da MOE LVL pada z naraščajočo vlažnostjo in da je v negativni korelaciji s temperaturo. Najvišji MOE ima LVL, ko je zmrznjen (pri ▫$-20^o C$▫) in najnižjega pri temperaturi ▫$60^o C$▫. Negativna odvisnost MOE LVL od temperature je izrazitejša pri višjih vlažnostih
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