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Nedestruktivne metode določanja relevantnih gradacijskih lastnosti žaganega lesa : diplomsko delo (univerzitetni študij) = Non-destructive methods to determine relevant graduation properties of sawn wood : graduation thesis (university studies)Čepon, MatijaMetode določanja mehanskih lastnosti lesa so lahko destruktivne (porušne) in nedestruktivne (neporušne). Ker imamo najpogosteje opravka z žaganim lesom, kasneje uporabljenim v konstrukcijske namene, ... je treba meritve izvajati tako, da lesne strukture ne poškodujemo. Metode, ki jih je glede na omenjeno zahtevo možno uporabiti, sodijo v skupino nedestruktivnih. Raziskovali smo možnosti uporabe različnih nedestruktivnih metod, njihovo zanesljivost in korelacije testiranih rezultatov. Preučevali smo različne mehanske in vizualne lastnosti žaganega lesa smrekovine (Picea abies L.), ki vplivajo na trdnost lesa. Metode, s katerimi smo preučevali deske (100 preizkušancev) in plohe (100 preizkušancev), so bile izvedene na osnovi vizualnega ocenjevanja lesa po DIN 4074-1, 4- točkovnega upogibnega testa po EN 408 in dinamičnih testov (metoda frekvenčnega odziva). Izkazalo se je, da ja povezava med vizualnimi in dinamičnimi rezultati dokaj šibka in nejasna, dobra pa med statičnimi in dinamičnimi. Koeficient korelacije med MOEs in MOEd je bil v vseh primerih večji od 0,9. Pomembna ugotovitev je, da z dinamičnimi rezultati (MOEd), zaradi specifike merjenja (t = 2s), dobimo za 12 % višje rezultate kot pri ostalih izvedenih metodah (metoda 4-točkovnega upogiba). To pomeni, da so polizdelki po tej metodi bistveno bolje ocenjeni in tako prinašajo višje cenovne vrednosti.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [M. Čepon], 2006Language - slovenianCOBISS.SI-ID - 1383561
Author
Čepon, Matija
Other authors
Gornik Bučar, Dominika |
Bučar, Bojan, 1961-2012 |
Gorišek, Željko
Topics
žagan les |
nedestruktivne metode |
vizualna metoda |
frekvenčna metoda |
construction wood |
non-destructive methods |
visual method |
frequency method
Library/institution |
City | Acronym | For loan | Other holdings |
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BF, Department of Wood Science and Technology, Lj. | Ljubljana | BFLES |
reading room 2 cop.
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DRS, in which the journal is indexed
Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Čepon, Matija | |
Gornik Bučar, Dominika | 10340 |
Bučar, Bojan, 1961-2012 | 01392 |
Gorišek, Željko | 05732 |
Source: Personal bibliographies
and: SICRIS
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