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Fatigue testing of scratched flapper valve steel
Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 80 credits / 120 HE creditsStudent thesisAlternative title
Utmattningsprovning av repat ventilstål (Swedish)
Abstract [en]

A flapper valve is made from a hardened and tempered high strength strip steel which opens and shuts as it is subjected to very high cyclic loads. Steel strip of which flapper valves are made from can   encounter a surface defect which are anticipated to influence fatigue life negatively. In this study, the influence of surface scratches on fatigue life of flapper valve strip was investigated. The analysis was carried out by using thirty samples that were blanked out of eight different steel strips in the transverse direction. Of these samples, fifteen of them had scratches on the surface and fifteen did not, all these samples were fatigue tested by constant amplitude method. An S-N curve was plotted based upon the values and results from the fatigue test, considering the curve as the nerve center in relation with fractrographic studies using the Scanning electron microscope. Therefore this master thesis work aims to explain the influence of scratches on fatigue life of flapper valve strip and suggest future improvements based on the findings.

Place, publisher, year, edition, pages
2014. , 52 p.
Series
Karlstad University Studies, ISSN 1403-8099 ; 1403-8099
Keyword [en]
flapper valve steel, fatigue testing, fatigue life measurements and comparison, stair case method, fatigue fractures
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kau:diva-31704OAI: oai:DiVA.org:kau-31704DiVA: diva2:705114
Subject / course
Materials Engineering, Master of Science
Educational program
Master of Science in Engineering, Degree Programme in Mechanical Engineering, specialisation in Materials Engineering (120 ECTS credits)
Presentation
2012-10-06, KARLSTAD UNIVERSITY, SE-651 88 Karlstad, Sweden, Karlstad, 13:30 (English)
Supervisors
Examiners
Available from: 2014-03-14 Created: 2014-03-14 Last updated: 2014-03-14Bibliographically approved

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