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Določanje elastomehanskih lastnosti lesa z ultrazvokom : diplomsko delo = Determination of elastomechanical properties of wood by ultrasound : B. Sc. thesisBremšak, BorutPreverili smo uporabnost ultrazvočnega določanja elastomehanskih lastnosti smrekovega, bukovega in macesnovega lesa. Iz naključno pridobljenih večjih sortimentov smo izdelali orientirane preizkušance ... dimenzij 40 x 40 x 40 mm. Preizkušance smo uravnovesili pri 20 °C in 50 % relativni zračni vlažnosti. Z merilcem časa preleta PunditLab smo s strižnimi ultrazvočnimi sondami v posameznih anatomskih smereh ter ravninah določili hitrosti preleta tlačnega in strižnega valovanja. Hitrost tlačnega ultrazvočnega valovanja je bila pri vseh lesovih največja vzdolž lesnih vlaken (L), v povprečju pa 3,5-krat manjša v radialni (R) smeri ter 1,5-krat manjša v tangencialni (T) smeri lesa. Hitrosti strižnega ultrazvočnega valovanja so bile pri vseh lesovih in anatomskih ravninah manjše od hitrosti tlačnih valov. Vpliv gostote lesa na hitrost ultrazvoka ni bil potrjen. Moduli elastičnosti so bili najvišji pri bukovini, nekoliko manjši pa pri macesnovini in smrekovini. Strižni moduli so bili v L-smeri lesa v povprečju 10-krat manjši, v R- in T-smeri lesa pa do 5-krat manjši od modulov elastičnosti. Za vse testirane lesne vrste smo potrdili, da so anizotropne in da odstopajo od ortotropnosti.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [B. Bremšak], 2017Language - slovenianCOBISS.SI-ID - 2804105
Author
Bremšak, Borut
Other authors
Straže, Aleš |
Trtnik, Gregor, 1979- |
Gorišek, Željko
Topics
les |
mehanske lastnosti |
ultrazvok |
anizotropija |
wood |
mechanical properties |
ultrasound |
anisotropy
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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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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Bremšak, Borut | |
Straže, Aleš | 18149 |
Trtnik, Gregor, 1979- | 27666 |
Gorišek, Željko | 05732 |
Source: Personal bibliographies
and: SICRIS
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