Spremembe mehanskih lastnosti bukovine po žledolomu : magistrska naloga

Plavčak, Denis (author), Gorišek, Željko (mentor), Straže, Aleš (reviewer)

V raziskavi smo proučevali mehanske lastnosti po žledolomu podrtih dreves navadne bukve (Fagus sylvatica L). Testni material smo vzeli iz štirih različno poškodovanih dreves in to na treh višinah debla: na prsni višini, na sredini in tik pod krošnjo. Mehanske lastnosti smo proučevali na sveži in vzporedni osušeni bukovini. Po standardnih metodah smo določili statični modul elastičnosti, upogibno trdnost, vzdolžni strižni trdnosti in tlačne trdnosti v vseh treh anatomskih smereh ter še dinamična modula elastičnosti z merjenjem hitrosti ultrazvoka in lastne frekvence. Po prvi vegetacijski dobi po žledolomu še nismo potrdili zmanjšanja mehanskih lastnosti, ugotovili pa smo značilno manjše vse proučevane trdnosti lesa iz juvenilnega obdobja v primerjavi z adultnim, medtem ko je gostota od stržena proti kambiju naraščala.

• Language: Slovenian
• Keywords: žledolom, bukev, mehanske lastnosti
• Work type: Master's thesis/paper
• Typology: 2.09 - Master's Thesis
• Organization: BF - Biotechnical Faculty
• Place of publishing: Ljubljana
• Publisher: D. Plavčak
• Year: 2016
• Number of pages: X, 48 str., [8] f. pril.
• PID: 20.500.12556/RUL-158687
• UDC: 630*423.3:812
• COBISS.SI-ID: 2634121
• Publication date in RUL: 19.06.2024

PLAVČAK, Denis, 2016, Spremembe mehanskih lastnosti bukovine po žledolomu : magistrska naloga [online]. Master’s thesis. Ljubljana : D. Plavčak. [Accessed 18 May 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=158687

Secondary language

• Language: English
• Title: Changes of the mechanical properties of beech wood after ice storm : M. Sc. thesis

Abstract

We investigated the mechanical properties of the felled beech wood trees (Fagus sylvatica L) after ice storm. The test material was taken from four different trees, differently damaged, at the three tree heights: at breast height, in the middle and just below the crown. Mechanical properties were studied in green and dried state, using parallel samples. Modulus of elasticity, bending strength, longitudinal shear strength and compressive strength were determined in all three anatomical directions by standard mechanical testinf and the dynamic modulus of elasticity by measuring the speed of ultrasound and frequency response. We have not yet confirmed the reduction in mechanical properties in the first growing season after ice storm. We found however significantly reduced all examined strengths of the wood from the juvenile- compared to adult wood, while the density from the pith toward the bark increased.

• Keywords: ice storm, beech, mechanical properties