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undergraduate thesis
Savojna čvrstoća drva hrasta u longitudialnom smjeru
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. urn:nbn:hr:235:877229
Špiranec, Renato
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Špiranec, R. (2018). Savojna čvrstoća drva hrasta u longitudialnom smjeru (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:877229

Špiranec, Renato. "Savojna čvrstoća drva hrasta u longitudialnom smjeru." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:877229

Špiranec, Renato. "Savojna čvrstoća drva hrasta u longitudialnom smjeru." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:877229

Špiranec, R. (2018). 'Savojna čvrstoća drva hrasta u longitudialnom smjeru', Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 20 December 2024, https://urn.nsk.hr/urn:nbn:hr:235:877229

Špiranec R. Savojna čvrstoća drva hrasta u longitudialnom smjeru [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2018 [cited 2024 December 20] Available at: https://urn.nsk.hr/urn:nbn:hr:235:877229

R. Špiranec, "Savojna čvrstoća drva hrasta u longitudialnom smjeru", Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:235:877229

Metadata
TitleSavojna čvrstoća drva hrasta u longitudialnom smjeru
Title (english)Bending strength of oak wood in the longitudinal direction
AuthorRenato Špiranec
MentorVera Rede (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2018-09-27, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Drvo je prirodni biokompozitni materijal s izrazito usmjerenom mikrostrukturom što za posljedicu ima i veliku usmjerenost svojstava u tri glavne osi: radijalnoj, longitudinalnoj i tangencijalnoj. Svojstva se razlikuju od vrste do vrste, a velike razlike mogu biti i unutar istog debla. Zbog svega navedenog, pri ispitivanju bilo kojeg mehaničkog svojstva, potrebno je napraviti veliki broj mjerenja da bi se dobili pouzdani rezultati. U ovom završnom radu određena je savojna čvrstoća hrasta lužnjaka u longitudinalnom smjeru metodom savijanja u tri točke. Također je određen utjecaj kuta između savojne sile i tijeka godova na visinu savojne čvrstoće (0°, 45° i 90°). Dobiveni rezultati pokazuju da je ukupna srednja vrijednost savojne čvrstoće hrasta lužnjaka u longitudinalnom smjeru iznosi 173,7 N/mm2 i nešto je viša od vrijednosti koje se za istu vrstu mogu naći u literaturi. Također se pokazalo da kut između savojne sile i linije godova vrlo malo utječe na vrijednost savojne čvrstoće. Najviše vrijednosti su dobivene za kut od 0° gdje srednja vrijednost savojne čvrstoće iznosi 175,3 N/mm2, a najmanje vrijednosti za kut od 45° gdje je srednja vrijednost 172,6 N/mm2. Srednja vrijednost savojne čvrstoće za kut od 90° iznosi 173,2 N/mm2. Statistička analiza pokazala je da se dobiveni rezultati ponašaju po zakonu Weibullove razdiobe, te da je vrijednosti Weibullovog modula visoka za sve tri skupine uzoraka.
Abstract (english)
Wood is a natural biocomposite material with a highly directed microstructure and, therefore, properties that vary in the three principal axes: radial, longitudinal and tangential. Properties vary not only within the wood species, but also within the three trunk. Consequently, a large number of measurements are required to obtain reliable results for any mechanical property. In this work, the bending strength of the oak in the longitudinal direction was determined by the three-point bending test. Also, the effect of the angles between the direction of load and annual rings’ orientation (0°, 45° i 90°) on the bending strength was determined. According to the obtained results, the mean bending strength of the oak was found to be 173.7 N/mm2 and it is slightly higher than the values that can be found for the same species in the literature. This investigation has shown that load-to- annual ring direction slightly effected the bending value. The highest value was obtained at angle of 0 ° where the mean bending strength was found to be 175.3 N/mm2 and the lowest value was obtained at angle of 45 ° where the mean bending strength was found to be 172.6 N/mm2. The mean bending strength at angle of 90° was 173.2 N/mm2. Statistical analysis has shown that the obtained results follow Weibull distribution and the Weibull modulus values of three measured groups are high.
Keywords
Languagecroatian
URN:NBNurn:nbn:hr:235:877229
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
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Created on2019-05-22 23:04:37