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Overload effects on the fatigue crack propagation behaviour in Inconel 718
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, The Institute of Technology.
2012 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

In this master thesis, work done in the TURBO POWER project High temperature fatigue crack propagation in nickel-based superalloys during spring 2012 will be presented. The overall objective of this project is to develop and evaluate tools for designing against fatigue in gas turbine applications, with special focus on the crack propagation in the nickel-based superalloy Inconel 718. Experiments have been performed to study the effect of initial overloads, and it has been shown that even for small initial overloads a significant reduction of the crack growth rate is received. Furthermore, FE simulations have been carried out in order to describe the local stress state in front of the crack tip since it is believed to control, at least partly the diffusion of oxygen into the crack tip and thus also the hold time crack growth behaviour of the material. Finally, an evaluation method for the stresses is presented, where the results are averaged over an identifiable process/damaged zone in front of the crack tip.

Place, publisher, year, edition, pages
2012. , 45 p.
Keyword [en]
Nickel-based superalloys, Inconel 718, fatigue crack propagation, high temperature hold times, overload effects
National Category
Applied Mechanics
URN: urn:nbn:se:liu:diva-77494ISRN: LIU-IEI-TEK-A--12/01290--SEOAI: diva2:527488
Subject / course
Solid Mechanics
2012-05-15, A34, Linköping University, SE-581 83,, Linköping, 09:00 (Swedish)
Available from: 2012-05-21 Created: 2012-05-21 Last updated: 2012-05-21Bibliographically approved

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Lundström, Erik
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