13 KB159 KB11 KB199920252005Štubňa, IgorTrnik, Antonštevilka:25 straniletnik:51str. 90-94ISSN:0039-2480COBISSID:8161563URN:URN:NBN:SI:doc-P59TMULKenAssociation of Mechanical Engineers and Technicians of Slovenia et al.Zveza strojnih inženirjev in tehnikov Slovenije et al.Strojniški vestnikenačbe diferencialneizraz Timošenkovmodelimomenti upogibninihanje upogibnoupogibno nihanjeIzrazi za popis upogibnega nihanja palice nespremenljivega prereza| Equations for the flexural vibration of a sample with a uniform cross-section|A short review of the known equations of flexural vibration used for determining the Young's modulus and sound velocity is presented, as well as a new equation that accounts for the rotary inertia and the influence of the shear forces with the term , where iz is the radius of gyration of the cross-section, m is Poisson's ratio, and k is the shape coefficient introducedby Timoshenko. The dispersion curves show a very good fit between the commonly accepted Timoshenko's equation and the new equation derived by Stubňa and MajerníkV prispevku je predstavljen kratek pregled ze znanih izrazov za popis upogibnega nihanja, uporabljenih za določitev Youngovega modula in hitrosti zvoka. Predstavljen je tudi nov izraz, ki velja za vztrajnost krozenja in vpliv strižnih sil z izrazom , v katerem je iz polmer vrtenja prereza, m je Poissonovo razmerje in k je oblikovni faktor, ki ga je uvedel Timošenko. Krivulje porazdelitve kazejo zelo dobro ujemanje splošno uporabljanega Timošenkovega izraza in novega izraza, ki sta ga razvila Stubňa in MajerníkTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za strojništvo