Utjecaj usmjerenosti strukture na tvrdoću i abrazijsku otpornost drva masline

master's thesis

• Title (english): Influence of structure orientation on hardness and abrasion resistance of the olive wood
• Author: Josip Klanac
• Mentor: Vera Rede (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-07-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Cilj ovog rada bio je odrediti kako usmjerenost strukture utječe na tvrdoću i gubitak volumena pri abrazijskom trošenju drva masline (lat. Olea europea).
Ispitivanje trošenja na abraziju provedeno je metodom „suhi pijesak – gumeni kotač“, a tvrdoća je mjerena Brinellovom metodom.
U radu je utvrđeno kako postoji vrlo niska linearna korelacija između usmjerenosti strukture i vrijednosti tvrdoće te gubitka volumena pri abraziji. Porastom kuta između abradirane površine i tangente na god, odnosno postupnim prelaskom iz tangencijalnog u radijalni presjek, blago se povećava gubitak volumena pri abraziji te blago pada tvrdoća. Između tvrdoće i gustoće postoji značajna pozitivna linearna korelacija dok je između gubitka volumena pri abraziji i gustoće linearna korelacija vrlo slaba i pozitivna. Između tvrdoće i gubitka volumena pri abraziji postoji vrlo slaba negativna linearna korelacija.
Vrijednosti i rasipanja rezultata statistički su analizirani pomoću Weibullove razdiobe te je utvrđeno da se vrijednosti za gustoću, gubitak volumena pri abrazijskom trošenju i tvrdoću ponašaju u skladu s razdiobom.

Abstract (english)

The aim of this work was to determine how the orientation of the structure affects the hardness and loss of volume during abrasive wear of olive wood (lat. Olea europea).
Abrasion wear testing was performed using the "dry sand - rubber wheel" method, and hardness was measured using the Brinell method.
The paper found that there is a very low linear correlation between the directionality of the structure and the value of hardness and volume loss during abrasion. With the increase in the angle between the abraded surface and the tangent to the tree ring, i.e. with the gradual transition from the tangential to the radial section, the loss of volume during abrasion increases slightly and the hardness decreases slightly. There is a significant positive linear correlation between hardness and density, while between volume loss during abrasion and density, the linear correlation is very weak and positive. There is a very weak negative linear correlation between hardness and volume loss during abrasion.
The values and dispersion of the results were statistically analyzed using the Weibull distribution, and it was determined that the values for density, volume loss during abrasive wear and hardness behave in accordance with the distribution.

• Keywords: abrazijsko trošenje; tvrdoća; gustoća; maslina
• Keywords (english): abrasive wear; hardness; density; olive tree
• Language: croatian
• URN:NBN: urn:nbn:hr:235:609186
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering, Mechatronics and Robotics, Autonomous Systems; Course: Materials 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: 2022-07-08 14:46:59