Vpliv klimatskih pogojev na delovanje lesa

diplomsko delo - visokošolski strokovni študij

Andreja Dovč (Author), Aleš Straže (Reviewer), Željko Gorišek (Mentor)

Abstract

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.

Keywords

les;ravnovesna vlažnost;dimenzijska stabilnost;smrekovina;bukovina;

Data

Language:	Slovenian
Year of publishing:	2013
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[A. Dovč]
UDC:	630*847
COBISS:	2168201
Views:	392
Downloads:	77
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Influence of climatic conditions on dimensional stability of wood
Secondary abstract:	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.
Secondary keywords:	wood;equilibrium moisture content;dimensional stability;spruce wood;beech wood;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	VIII, 31 f.
ID:	11904381