Zgradba, lastnosti in možnosti uporabe lesa octovca

diplomski projekt

Jera Burdych (Author), Katarina Čufar (Reviewer), Željko Gorišek (Mentor)

Abstract

Raziskali smo izbrane lastnosti lesa octovca (Rhus typhina L.), ki bi utegnile predvideti njegovo uporabo. Proučevali smo makro- in mikroskopsko anatomsko zgradbo, izbrane fizikalne lastnosti (radialno porazdelitev gostote in vlažnosti, krčenja in nabrekanja, kazalnike dimenzijske stabilnosti) ter nekatere mehanske lastnosti (modul elastičnosti, tlačno, upogibno in strižno trdnost). Ugotovili smo, da les octovca spada med venčasto porozne lesne vrste. Povprečna gostota v absolutno suhem stanju lesa je 514 kg/m3. Vlažnost svežega lesa v povprečju znaša 58,2 %. Krčenje in nabrekanje je majhno, nizka je tudi točka nasičenja celičnih sten, ki znaša 19,3 %. Kazalniki dimenzijske stabilnosti so ugodni, razen sorpcijskega kvocienta, ki je normalen, in anizotropije, ki je neugodna. Iz primerjave fizikalnih in mehanskih lastnosti lesa z lipovino in domačo kostanjevino ocenjujemo, da je les octovca primeren za manjše, nekonstrukcijske izdelke, saj je njegova upogibna trdnost 47 do 68 MPa, modul elastičnosti pa v povprečju le 5,3 GPa.

Keywords

octovec;Rhus typhinus;les;vlažnost;gostota;sorpcija;mehanske lastnosti;

Data

Language:	Slovenian
Year of publishing:	2012
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[J. Burdych]
UDC:	630*812:582.746.66
COBISS:	2044041
Views:	939
Downloads:	190
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Structure, properties and potential use of staghorn sumac wood
Secondary abstract:	We investigated selected properties of staghorn sumac wood (Rhus typhina L.) which might provide its usage. We researched the anatomical structure and macroscopic features, some physical properties (radial distribution of moisture content and density, shrinkage and swelling, dimensional stability) as well as some mechanical properties (MOE, compressive, bending and shear strength). The survey shows that staghorn sumac wood belongs to the ring-porous deciduous trees. The density of the oven dry wood is 514 kg/m3. Moisture content of fresh wood is approximately 58.2 %. Shrinkage and swelling is small, also because of low MC at fibre saturation point, which is 19.3 %. Indicators of dimension stability are favourable, with the exceptions of sorption quotient being normal and anisotropy being unfavourable. Comparison with lime and chestnut wood shows that staghorn sumac wood is suitable for small, non-structural elements, because of its low bending strength (47-68 MPa) and low modulus of elasticity (5.3 GPa).
Secondary keywords:	Rhus typhina;wood;moisture content;density;sorption;mechanical properties;
Type (COBISS):	Diploma project paper
Thesis comment:	Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	VII, 34 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;mathematics;natural sciences;naravoslovne vede;matematika;botany;botanika;systematic botany;sistematska botanika;rosidae;
ID:	22119