20.500.12556/RUL-117608 Vpliv klimatskih pogojev na delovanje lesa diplomsko delo - visokošolski strokovni študij Influence of climatic conditions on dimensional stability of wood Preučevali smo dimenzijsko in oblikovno stabilnost smrekovine in bukovine pri izpostavitvi različnim vlažnostnim obremenitvam: nihajočim klimatskim razmeram med relativnima zračnima vlažnostma 33 % in 87 %, postopnim sušenjem iz svežega stanja do absolutno suhega stanja in različnim ostrinam uravnovešanja. Odzive lesa smo vrednotili z diferencialnim nabrekom in s koeficientom nabrekanja v radialni in tangencialni smeri ter s prečno krčitveno anizotropijo. Pri večkratnem navlaževanju in sušenju smo ugotovili zmanjševanje razlik ravnovesnih vlažnosti,posledično pa so bile vedno manjše tudi dimenzijske spremembe in prečna krčitvena anizotropija. Potrdili smo predpostavko, da nihajoče klimatske razmere nekoliko povečajo dimenzijsko in oblikovno stabilnost lesa. We have studied the stability of shape and dimensions of spruce wood and beech wood when exposed to various humidity factors: changing climatic conditions with relative humidity ranging between 33 % and 87 %, gradual drying from fresh to completely dry state and different equilibrium parameters. The dimensional changes of wood were evaluated by means of differential swelling and swelling coefficient in radial and tangential direction, and with transverse shrinkage anisotropy. After several repeated wetting and drying procedures it was established that the differences in equilibrium moisture content were reduced, resulting also in smaller dimensional terations and transverse shrinkage anisotropy. We confirmed the assumption that changing climatic conditions somewhat increase the stability of wood in terms of shape and dimensions. les ravnovesna vlažnost dimenzijska stabilnost smrekovina bukovina wood equilibrium moisture content dimensional stability spruce wood beech wood true false false [A. Dovč] Slovenski jezik Angleški jezik Diplomsko delo 2020-07-17 13:00:00 2020-07-17 13:00:03 2022-08-29 03:44:27 0000-00-00 00:00:00 2013 0 Ljubljana 2013 Ljubljana VIII, 31 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*847 2168201 UNI_Dovc_Andreja_2013.pdf UNI_Dovc_Andreja_2013.pdf 1 9DCB1514712D9BAD37E774021D57AE04 e549b9143d7697b33a2414958daac16bc6cfdb43df25df9c2f8e65424da73335 38473e49-a1b9-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=131488 Biotehniška fakulteta 0 0 0