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Vpliv toplotne obdelave na mehanske lastnosti jelovine : diplomski projekt = Influence on heat treatment on mechanical properties of fir : B. Sc. thesisSmonkar, GregorRaziskali smo vpliv toplotne obdelave na mehanske lastnosti jelovine. Vizualno smo izbrali 45 jelovih žaganic, nominalnih dimenzij 4000 x 120 x 45 mm, ter jih razvrstili po gostoti v 9 razredov. ... Žaganice smo nato toplotno obdelali v industrijskem vakuumskem postopku v podjetju Silvaprodukt pri štirih različnih končnih temperaturah toplotne obdelave (170 °C, 190 °C, 210 °C, 230 °C), po en preizkušanec iz vsakega razreda pa smo pustili za kontrolo. Mehanske lastnosti smo proučili neporušno, z metodo frekvenčnega odziva pri prečnem in vzdolžnem vzbujanju, ter z merjenjem hitrosti ultrazvoka. Z metodo končnih elementov je bil izdelan tudi numerični model odziva preizkušancev na zunanjo mehansko motnjo. Izguba mase preizkušancev je eksponentno naraščala z višanjem temperature toplotne obdelave. Modul elastičnosti se je najbolj spremenil v vzdolžni smeri lesa; pri višanju intenzivnosti toplotne obdelave je sprva naraščal, pri najvišji temperaturi pa zopet padel. Značilnega trenda spremembe togosti v prečni smeri lesa zaradi velike variabilnosti nismo potrdili. Frekvenčni odziv pri prečnem vzbujanju preizkušancev je potrdil nižanje modula elastičnosti z višanjem nihajnega načina. Z večanjem razlik med togostjo v posameznem nihajnem načinu smo pri toplotno obdelani jelovini potrdili večjo strukturno nehomogenost. Numerični model mehanskega odziva preizkušancev je pokazal primerljive rezultate realnemu odzivu preizkušancev.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [G. Smonkar], 2016Language - slovenianCOBISS.SI-ID - 2635145
Author
Smonkar, Gregor
Other authors
Straže, Aleš |
Fajdiga, Gorazd |
Gorišek, Željko
Topics
toplotna obdelava lesa |
mehanske lastnosti |
jelovina |
modul elastičnosti |
heat treatment |
mechanical properties |
fir (Abies alba Mill.) |
modul of elasticity
Library/institution |
City | Acronym | For loan | Other holdings |
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BF, Department of Wood Science and Technology, Lj. | Ljubljana | BFLES |
reading room 1 cop.
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Shelf entry
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Year | Impact factor | Edition | Category | Classification | ||||
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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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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Smonkar, Gregor | |
Straže, Aleš | 18149 |
Fajdiga, Gorazd | 15683 |
Gorišek, Željko | 05732 |
Source: Personal bibliographies
and: SICRIS
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