20.500.12556/RUL-158687 Spremembe mehanskih lastnosti bukovine po žledolomu magistrska naloga Changes of the mechanical properties of beech wood after ice storm M. Sc. thesis 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. 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. žledolom bukev mehanske lastnosti ice storm beech mechanical properties true false false D. Plavčak Slovenski jezik Angleški jezik Magistrsko delo/naloga 2024-06-19 11:36:28 2024-06-19 11:36:31 2024-07-03 03:37:44 0000-00-00 00:00:00 2016 0 Ljubljana 2016 Ljubljana X, 48 str., [8] f. pril. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 630*423.3:812 2634121 MAG_Plavcak_Denis_2016.pdf MAG_Plavcak_Denis_2016.pdf 1 358F78E84F72B1F1847F8B993C779A45 c4fea1eefda465423c25f694f4ce238c82d231344080ef95b3772d99b8dba81b 69bb0046-2e1f-11ef-aa1b-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=186399 Biotehniška fakulteta 0 0 0