Utjecaj orijentacije goda na abrazijsku otpornost drva obične smreke

undergraduate thesis

• Title (english): Annual ring orientation effect on abrasion resistance of European spruce
• Author: Andro Raič
• Mentor: Vera Rede (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2021-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Cilj ovog rada bio je odrediti otpornost na abrazijsko trošenje drva domaće smreke (Picea abies) u
longitudinalnom smjeru, od tangencijalnog (LT) do radijalnog presjeka (LR).
Ispitivanje otpornosti na abraziju provedeno je standardnom metodom „suhi pijesak – gumeni kotač“.
S obzirom na relativno ujednačenu gustoću abradiranih uzoraka, otpornost na trošenje izražena je
preko gubitka mase. Srednja vrijednost gustoće uzoraka drva smreke iznosila je 0,433 g/cm3.

Utvrđeno je da otpornost na abraziju ovisi o orijentaciji abradirane površine. Iako je rasipanje rezultata
vrlo veliko izražen je trend smanjenja abrazijskog trošenja s povećanjem kuta kojeg zatvara trošena
površina s tangencijalnim presjekom, od 0° do 90°. Najmanju otpornost na abrazijsko trošenje ima
tangencijalni presjek, a najveću radijalni. Srednji gubitak mase u radijalnom presjeku je za 48 % manji
u odnosu na tangencijalni, a na abradiranoj površini zakrenutoj za 45°, srednji gubitak mase manji je
za oko 9 %.

Abstract (english)

The aim of this study was to determine the abrasion resistance of domestic spruce wood (Picea abies)
in the longitudinal direction, from tangential (LT) to radial cross section (LR).
The abrasion resistance test was performed by the standard method "dry sand – rubber wheel". Given
the relatively uniform density of the abraded samples, the wear resistance is expressed through weight
loss. The mean density of spruce wood samples was 0.433 g/cm3.

It was found that the abrasion resistance depends on the orientation of the abraded surface. Although
the scattering of the results is very large, there is a pronounced trend of decreasing abrasion wear with
increasing angle closed by the worn surface with a tangential cross section, from 0° to 90°. The
tangential cross section has the lowest abrasion resistance and the radial cross-section the highest. The
mean weight loss in radial cross section is 48% lower compared to the tangential, and on the abraded
surface rotated by 45°, the mean weight loss is reduced by about 9%.

• Keywords: abrazijsko trošenje; usmjerenost strukture; drvo; smreka
• Keywords (english): abrasion wear; structure orientation; wood; spruce
• Language: croatian
• URN:NBN: urn:nbn:hr:235:726481
• Study programme: Title: 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 resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2021-02-23 22:41:57