Pregled porušnih mehanizmov natezno obremenjenih bukovih desk : diplomska naloga

Božič, Blaž (author), Hozjan, Tomaž (mentor), Straže, Aleš (comentor), Plos, Mitja (comentor)

Določanje kakovosti lesenih polproizvodov in izdelkov pred njihovo uporabo je brez ustrezne tehnologije precej težavno. Pri žaganem lesu ocenjevanje temelji na vizualnih karakteristikah lesa in lesenih izdelkov. Obstajajo določeni standardi za razvrščanje posameznega elementa v kakovostni razred, vendar je to področje še vedno precej neenotno. V okviru te diplomske naloge želimo določiti preprost algoritem za ocenitev natezne trdnosti bukovih desk. Ocena temelji na vizualnih karakteristikah bukovine. Najprej je v grobem opisan les kot material in njegove lastnosti ter določene vizualne značilnosti bukovine, ki naj bi najbolj vplivale na mehanske lastnosti in natezno trdnost lesa. V nadaljevanju analiziramo štiri različne tipe porušitve po ploskvi deske in dva tipa porušitve po robu deske, ki jih definiramo na podlagi eksperimentalnih opažanj. Nadalje poskušamo določiti, katere vizualne karakteristike so značilne za posamezen tip porušitve, in nato na podlagi rezultatov nateznih testov označiti, v kakšen razred nateznih trdnosti spada posamezen tip porušitve oziroma kombinacija porušitve po robu in po ploskvi deske.

• Language: Slovenian
• Keywords: bukove deske, natezna trdnost, vizualne karakteristike, natezni test, tip porušitve
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publisher: [B. Božič]
• Year: 2017
• PID: 20.500.12556/RUL-95444
• UDC: 624.011.1:694.6:539.419(043.2)
• COBISS.SI-ID: 8197729
• Publication date in RUL: 20.09.2017

BOŽIČ, Blaž, 2017, Pregled porušnih mehanizmov natezno obremenjenih bukovih  desk : diplomska naloga [online]. Bachelor’s thesis. B. Božič. [Accessed 17 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=95444

Secondary language

• Language: English
• Title: Review of tensile fracture mechanisms of beech boards : Graduation thesis

Abstract

Without special technologies, it is rather difficult to determine the quality of semi-finished and finished wood products before usage. In the case of sawn timber, the evaluation is based on the visual characteristics of wood and wood-based products. There exist certain classification systems to determine the grade of the wood-based products; however, there are still many inconsistencies in this field. The purpose of this thesis is to create a simple algorithm for estimating tensile strength of beech boards. The estimation is based on the visual characteristics of the beech wood. In the first part of the thesis, we briefly describe wood as a material and present its features as well as certain visual characteristics of beech wood that are most likely to influence the mechanical properties and the ultimate tensile strength of wood. In the following chapters, we analyse four different types of fracture on the surface of the board and two types of fracture on the edge of the board. These types of fracture are defined according to our experimental observations. Furthermore, we try to determine which visual characteristics are typical for each type of fracture. On the basis of the results of tensile tests, we try to determine the level of the ultimate tensile strength for each type of fracture or the combination of fractures on the edge and on the surface of the board.

• Keywords: beech boards, ultimate tensile strength, visual features, test of the tensile strength, type of fracture