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master's thesis
Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. urn:nbn:hr:235:335546
Čondrić, Ela
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

Čondrić, E. (2023). Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:335546

Čondrić, Ela. "Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. https://urn.nsk.hr/urn:nbn:hr:235:335546

Čondrić, Ela. "Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2023. https://urn.nsk.hr/urn:nbn:hr:235:335546

Čondrić, E. (2023). 'Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 22 June 2024, https://urn.nsk.hr/urn:nbn:hr:235:335546

Čondrić E. Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2023 [cited 2024 June 22] Available at: https://urn.nsk.hr/urn:nbn:hr:235:335546

E. Čondrić, "Varijabilnost savojnih svojstava tikovine u longitudinalnom smjeru", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2023. Available at: https://urn.nsk.hr/urn:nbn:hr:235:335546

Metadata
TitleVarijabilnost savojnih svojstava tikovine u longitudinalnom smjeru
Title (english)Variability of bending properties of teak wood in the longitudinal direction
AuthorEla Čondrić
MentorVera Rede (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2023-12-07, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
U diplomskom radu istraženo je kako na savojni modul elastičnosti i savojnu čvrstoću tikovine u longitudinalnom smjeru, utječe kut između savojne sile i tangente na god. Savojna čvrstoća i savojni modul elastičnosti ispitani su metodom savijanja u tri točke. Optičkom mikroskopijom i računalnom tomografijom analizirana je mikrostruktura tikovine u poprečnom, radijalnom i tangencijalnom presjeku. Potvrđeno je da tikovina ima prstenasto poroznu mikrostrukturu. Gustoća tikovine iznosila je 0,67 g/cm3 uz udio vlage od 6,56 %. Utvrđeno je da kut između savojne sile i tangente na god utječe na vrijednosti savojnog modula elastičnosti i savojne čvrstoće u longitudinalnom smjeru. Najviše vrijednosti izmjerene su kod kuta od 90°, a najniže kod kuta od 0°. Vrijednosti savojnog modula elastičnosti nalaze se u rasponu od 13,28 GPa do 14,77 GPa, a vrijednosti savojne čvrstoće u rasponu od 138,53 MPa do 151,41 MPa. Koeficijent varijacije za savojni modul elastičnosti je u dopuštenim granicama, a za savojnu čvrstoću prelazi normom dopuštene vrijednosti. Rezultati su dobro opisani Weibullovom razdiobom, a najveći Weibullov modul je kod uzoraka gdje je kut između savojne sile i tangente na godove 45°. Koeficijent korelacije za sve kutove je viši od 0,97.
Abstract (english)
In this thesis, it was investigated how the bending modulus of elasticity and bending strength of teak in the longitudinal direction is affected by the angle between the bending force and the tangent to the annual ring. Bending strength and bending modulus of elasticity were tested using the three-point bending method. The microstructure of teak in cross, radial, and tangential section was analyzed by optical microscopy and computed tomography. It has been confirmed that teak has a ring-porous microstructure. The density of teak was 0.67 g/cm3 with a moisture content of 6.56%. It was found that the angle between the bending force and the tangent to annual ring affects the values of the bending modulus of elasticity and bending strength in the longitudinal direction. The highest values were measured at an angle of 90°, and the lowest at an angle of 0°. The bending modulus values are in the range from 13.28 GPa to 14.77 GPa, and the bending strength values are in the range from 138.53 MPa to 151.41 MPa. The coefficient of variation for the bending modulus of elasticity is within the permissible limits, and for the bending strength it exceeds the permissible values. The results are well described by the Weibull distribution, and the largest Weibull modulus is found in samples where the angle between the bending force and the tangent to the grain is 45°. The correlation coefficient for all angles is higher than 0.97.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:335546
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2023-12-06 10:45:08