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Določanje statičnega in dinamičnega modula elastičnosti bukove vezane plošče = Determination of dynamic and static modulus of elasticity of beech plywoodMerhar, MiranV raziskavi smo primerjali vrednosti dinamičnega in statičnega modula elastičnosti 7- in 11-slojne vezane plošče z različnimi kombinacijami usmeritve tkiva posameznih slojev furnirjev. Dinamični ... modul smo določili iz lastnih frekvenc prvega in drugega nihajnega načina nihanja, kjer smo uporabili Bernoulli-Eulerjevo enačbo, statični modul pa s 4-točkovnim upogibnim testom. Rezultati so pokazali, da ima vezana plošča največji modul elastičnosti pri usmeritvi tkiva zunanjega sloja 0°, nato pa z naraščanjem kota modul pada. Dinamični modul je od statičnega v povprečju za 12 % večji pri 7-slojnih ploščah in za 14 % pri 11-slojnih ploščah. Dinamični modul, določen iz druge lastne frekvence, je v primerih, kjer ni vpliva striga, enak modulu iz prve lastne frekvence, ko pa se pojavi vpliv striga, se modul zniža. Iz omenjene raziskave lahko potrdimo, da sta tako statični kot tudi dinamični način določanja modula elastičnosti vzorcev vezane plošče ustrezna, vendar pa je treba pri dinamičnem načinu preveriti vpliv striga.Source: Les = Wood. - ISSN 0024-1067 (Letn. 69, št. 2, 2020, str. 59-69)Type of material - article, component part ; adult, seriousPublish date - 2020Language - slovenianCOBISS.SI-ID - 44802563
Author
Merhar, Miran
Topics
vezana plošča |
bukev |
modul elastičnosti |
nihanje |
statični test |
strig |
strig |
plywood |
beech |
modulus of elasticity |
vibration |
static test |
shear |
shear
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Merhar, Miran | 22063 |
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