diplomsko delo
Andrej Likeb (Author), Nenad Gubeljak (Mentor), Jožef Predan (Co-mentor)

Abstract

Visoko trdnostna jekla se uporabljajo na področjih velikih dinamičnih obremenitev. Zaradi česar se proizvajalci običajno soočajo s težavami, kako zagotoviti trajno dinamično trdnost. Za njeno zagotovitev največkrat posegajo po naknadnih termičnih obdelavah. Namen diplomskega dela je tako narediti primerjalno analizo utrujenostne rasti razpoke v skladu s standardom ASTM E 1820 - 01, za termično mehko in termično obdelano vzmetno jeklo 51CrMOV4. Diplomsko delo temelji na eksperimentalnih meritvah v LSEK laboratoriju na Fakulteti za strojništvo, kjer so se izvajali lomnomehanski preizkusi z metodo mehanike loma, določevale utrujenostne rasti razpoke in materialna parametra Parisovega zakona. Obdelava podatkov je potekala v programu Microsoft Excel 2010, s katerim so tudi bili izrisani diagrami. V diplomskem delu je v splošnem opisana mehanika loma ter področje utrujanja: njeni mehanizmi za nastanek, LCF in HCF utrujanje, določevanje hitrosti rasti razpoke in razni vplivi nastanka. Kratko poglavje v diplomskem delu je namenjeno tudi pripravi upogibnih lomnomehanskih preizkušancev v skladu s standardi.

Keywords

vzmetno jeklo;mehanika loma;žilavost;lomna žilavost;termična obdelava jekla;utrujenost materiala;rast razpoke;preiskava materiala;diplomske naloge;

Data

Language: Slovenian
Year of publishing:
Source: Maribor
Typology: 2.11 - Undergraduate Thesis
Organization: UM FS - Faculty of Mechanical Engineering
Publisher: [A. Likeb]
UDC: [539.42:620.178]:669.018.259(043.2)
COBISS: 15806486 Link will open in a new window
Views: 3574
Downloads: 330
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: English
Secondary title: Influence of thermal treatments on fracture toughness of spring steel
Secondary abstract: High strength steels are used in fields of large dynamic loads. Leading manufacturers are usually confronted with problems like, how to ensure fatigue limit. To ensure, they mostly reach to subsequent thermal treatment. The purpose of Diploma thesis is, to make a comparative analysis of fatigue crack growth, for thermal soft and thermal treathed 51CrMOV4 spring steel in accordance with ASTM E 1820-01 standard. Diploma work is based on experimental measurements in LSEK laboratory at the Faculty of Engineering, where tests are conducted on fracture toughness with prescriptive method of fracture mechanics, determined fatigue crack growth and material parameters for Paris’ law. Processing of the data was held in Microsoft Excel 2010, with which diagrams also were drawn. The Diploma thesis described in the general field of fracture mechanics and fatigue: the mechanism for the formation, LCF and HCF fatigue, crack growth rate determination and the creation fatigue failure by various effects. A short chapter in the thesis is also intended to prepare the bending fracture toughness specimen in accordance with the standards.
Secondary keywords: fracture mechanics;steel;spring steel;fatigue;fracture toughness;crack growth;thermal treatment;
URN: URN:SI:UM:
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Mariboru, Fak. za strojništvo
Pages: XXI, 135 f.
Keywords (UDC): applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;engineering;technology in general;inženirstvo;tehnologija na splošno;materials testing;commercial materials;power stations;economics of energy;preiskava materiala;blagoznanstvo;energetske centrale;energetika;applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;chemical technology;chemical and related industries;kemijska tehnologija;kemijske in sorodne industrije;metallurgy;metalurgija;
ID: 1004019