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Nedestruktivne metode določanja relevantnih gradacijskih lastnosti žaganega lesa : diplomsko delo (univerzitetni študij)
Čepon, Matija (Author), Gornik Bučar, Dominika (Mentor) More about this mentor... This link opens in a new window, Bučar, Bojan (Co-mentor), Gorišek, Željko (Reviewer)

URLURL - Presentation file, Visit http://www.digitalna-knjiznica.bf.uni-lj.si/dn_cepon_matija.pdf This link opens in a new window

Abstract
Metode 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.

Language:Slovenian
Keywords:žagan les, nedestruktivne metode, vizualna metoda, frekvenčna metoda
Work type:Undergraduate thesis (m5)
Tipology:2.11 - Undergraduate Thesis
Organization:BF - Biotechnical Faculty
Year:2006
Publisher:[M. Čepon]
Number of pages:X, 43 f., [27 f. pril.]
Place:Ljubljana
UDC:630*812:630*832.181
COBISS.SI-ID:1383561 Link is opened in a new window
Views:656
Downloads:178
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Secondary language

Language:English
Abstract:
The methods to determine mechanical properties of wood can be either destructive or non-destructive. Usually we have to deal with the sawn wood meant to be used for construction purposes, therefore, not to make damage the non-destructive method should be used. Different non-destructive methods, their reliability, and correlations of testing results were researched and compared. Various mechanical and visual properties of pine sawn wood (Picea abies L.) were studied. Visual testing (DIN 4074-1), 4-point bending test (EN 408) and dynamic tests (method of frequency response) were performed. The relationship between visual and dynamic results was found out to be poor. Good correlation was obtained between static and dynamic results. In all the cases the coefficient of the correlation between MOEs and MOEd is higher than 0.9. It should also be noted that the dynamic results (MOEd) are 12 % higher than other results (e.g.: MOEs), because of a different nature of measurement (t = 2s). This means that using a dynamic method the semi-manufactured.

Keywords:construction wood, non-destructive methods, visual method, frequency method

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