Utjecaj orijentacije drvnih vlakanaca na abrazijsku otpornost drva

undergraduate thesis

• Title (english): Influence of wood fibre orientation on abrasion resistance of wood
• Author: Ivan Oreški
• 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

Abstract

Osnovni cilj ovog rada bio je istražiti kako usmjerenost vlakanaca utječe na abrazijsku otpornost drva hrasta kitnjaka u smjeru rasta drva i u obrnutom smjeru.
U eksperimentalnom dijelu rada analizirana je mikrostruktura u tri karakteristična presjeka, izmjerena je gustoća i provedeno ispitivanje otpornosti na abrazijsku otpornost standardnom metodom „suhi pijesak – gumeni kotač“.
Utvrđeno je da orijentacija vlakanaca ima veliki utjecaj na intenzitet abrazijskog trošenja u radijalnom i tangencijalnom presjeku. U oba presjeka trošenje je puno intenzivnije kada je smjer trošenja obrnut od smjera vlakanaca, osobito u radijalnom presjeku. Ukupni gubitak mase pri trošenju u oba smjera zajedno, malo je veći u tangencijalnom nego u radijalnom presjeku. Udaljenost od srčike prema kori debla nema veliki utjecaj na intenzitet trošenja. Povećanjem udaljenosti od podnožja debla gubitak mase pri abraziji pokazuje tendenciju rasta.
Srednja vrijednost gustoće uzoraka na kojima je ispitana otpornost na abrazijsko trošenje iznosila je 0,984 g/cm3.

Abstract (english)

Main goal of this work was to investigate how the orientation of the fibers affects the abrasion
resistance of sessile oak wood in direction of wood growth and inversely. In the experimental
part of this work, the microstructure in three characteristic cross - sections was analyzed, the
density was measured and the abrasion resistance test was performed by the standard method
"dry sand - rubber wheel".It was found that the orientation of the fibers has a great influence on
the intensity of abrasion wear in radial and tangential cross section. In both sections the wear is
much more intense when the direction of wear is reversed from the direction of the fibers,
especially in the radial section.
The total weight loss in both directions was slightly higher in tangential than in radial cross
section. Distance from the heart to the bark of the trunk doesn't have a great influence on the
intensity of wear. As the distance from the base of the trunk increases, the loss of weight during
abrasion grows.
Mean density of the samples on which the abrasion resistance was tested was 0.984 g/cm3.
.

• Keywords: drvo; usmjerenost drvnih vlakanaca; abrazijska otpornost
• Keywords (english): wood; orientation of the wood fibers; abrasion resistance
• Language: croatian
• URN:NBN: urn:nbn:hr:235:612771
• 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: 2021-02-19 17:02:28