Usporedba abrazijske otpornosti tikovine u poprečnom, radijalnom i tangencijalnom presjeku

master's thesis

• Title (english): Comparison of the abrasion wear resistance of the teak wood in cross, radial, and tangential sections
• Author: Ana Grgić
• Mentor: Vera Rede (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-12-07, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

U diplomskom radu analizirana je mikrostruktura i istražen utjecaj usmjerenosti strukture drva tikovine na abrazijsku otpornost i tvrdoću. Mikrostruktura je analizirana na svjetlosnom mikroskopu i pomoću računalne tomografije. Tvrdoća je mjerena metodom po Brinellu, a intenzitet abrazijskog trošenja određen je na uređaju Taber abrader.
Mikrostruktura tikovine je izrazito usmjerena, a traheje su grupirane u ranom dijelu goda. Gustoća tikovine iznosila je 0,67 g/cm3.
Najveća otpornost na abraziju izmjerena je na poprečnom presjeku. Tangencijalni i radijalni presjek imaju manju i međusobno sličnu otpornost na abraziju. Veličina abrazivnog zrna ima veliki utjecaj na intenzitet abrazijskog trošenja kod sva tri osnovna presjeka. Na svim presjecima uočen je fenomen kritične veličine abrazivnog zrna i iznosi oko 125 μm.
Najviša srednja vrijednost tvrdoće izmjerena je na poprečnom presjeku i iznosi 8,89 HB. Tangencijalni i radijalni presjek imaju niže i međusobno slične vrijednosti tvrdoće.

Abstract (english)

In this thesis, the microstructure of teak wood has been analyzed and the influence of the structure's orientation on abrasion resistance and hardness was investigated. The light microscope was used to analyze the teak microstructure, as well as computerized tomography. Hardness was measured using the Brinell method while intensity of abrasive wear was determined on a Taber abrader.
The microstructure of teak wood is highly oriented with vessels grouped together in the earlywood. The density of teak wood was measured and it amounted to 0.67 g/cm³.
The highest abrasion wear resistance was measured in the cross section. The radial and tangential sections have lower resistance to abrasion than cross section, as well as very similar amongst themselves. The size of the abrasive grain has a significant impact on the intensity of abrasion wear in all three primary sections. The phenomenon of critical abrasive grain size was observed in all three sections and is about 125 μm.
The highest average Brinell hardness was measured in the cross section and has reached 8.89 HB. The tangential and radial section exhibit lower and relatively similar hardness values to each other.

• Keywords: abrazijska otpornost; tvrdoća; mikrostruktura; tikovina
• Keywords (english): abrasion wear resistance; hardness; microstructure; teak
• Language: croatian
• URN:NBN: urn:nbn:hr:235:434352
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-12-06 10:54:51