BF, Dept. of Wood Technology, Lj. (BFLES)
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Lezenje tenzijskega in normalnega lesa bukovine : diplomsko delo (visokošolski strokovni študij) = Creep of tension and normal beech wood : graduation thesis (higher professional studies)Nikl, KristijanPredstavili smo dela na pridobitvi, pripravi, raziskavi in analizi tenzijskega lesa bukovine (Fagus sylvatica) in njegovega lezenja ob konstantni obremenitvi v primerjavi z normalnim lesom. Vzorci ... tenzijskega in normalnega lesa so bili skrbno izbrani in izrezani ter počasi osušeni do točke nasičenosti celičnih sten. S tem smo zagotovili, da v mikrostrukturi ni prišlo do sprememb tkiva, povezanih s spremembo vsebnosti vlage. Vzorci (220 mm x 10 mm x 5 mm) so bili upogibno obremenjeni v napravi za 4 točkovni upogib,s silo 20 N, pri temperaturi 22 °C in kontrolirani visoki relativni zračni vlažnosti 98 %. Preizkusi so trajali od 3 dni do več tednov, odvisno od namena preizkusa. V grobem lahko rečemo, da so vsi preizkušanci imeli približno identično elastično deformacijo, vendar so vzorci z vsebnostjo tenzijskega tkiva ob nastopu lezenja krepko odstopali od normalnih. Pridobljene podatke smo ovrednotili z obstoječim 4 parametričnim Burgersovim modelom. Ugotovili smo, da tenzijsko tkivo omogoča lezenje lesa že ob minimalnih obremenitvah: glede meje elastičnosti normalnega lesa, saj je navedena sila predstavljala komaj slabih 50 % obremenitve. Takšna sila pri normalnem tkivu ni povzročila omembe vrednega lezenja, medtem ko je tenzijsko tkivo prikazalo izrazito primarno in sekundarno lezenje, ki jasno potrjuje odziv na natezno oziroma tlačno obremenitev želatinastega sloja v strukturi tenzijskega lesa.Type of material - undergraduate thesis ; adult, seriousPublication and manufacture - Ljubljana : [K. Nikl], 2006Language - slovenianCOBISS.SI-ID - 1445513
Author
Nikl, Kristijan
Other authors
Bučar, Bojan, 1961-2012 |
Gorišek, Željko |
Houška, Mladen
Topics
bukev |
reakcijski les |
tenzijski les |
lezenje |
tenzija |
viskoelastičnost |
beech wood |
creep |
tension wood |
tension |
reaction wood |
viscoelastics
Call number – location, accession no. ... |
Copy status | Reservation |
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Knjižnica BF za lesarstvo vsn 0000000166 IN: 020060137 Knjižnica BF za lesarstvo vsn 166 IN: 020060137 |
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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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Nikl, Kristijan | |
Bučar, Bojan, 1961-2012 | 01392 |
Gorišek, Željko | 05732 |
Houška, Mladen | 00959 |
Source: Personal bibliographies
and: SICRIS
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