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High-cycle fatigue design of a single crystal alloy including the scale effect and plasticity
KTH, School of Engineering Sciences (SCI), Solid Mechanics (Dept.), Solid Mechanics (Div.).
2018 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

For the same maximum local stress, a structure with a stress concentration has a higher endurance limit than a structure submitted to an homogeneous stress field. This is what is called the scale effect. In this work, one aspect of the scale effect is studied; the volume effect. When there is stress concentration in a component, the highly loaded volume is very small. The probability to find a major defect in the small volume is then quite low and the endurance limit is increased compared to an homogeneous stress field. Safran Aircraft Engines wants to integrate the effect in the high cycle fatigue design of the turbine blades to prevent the design to be overly conservative. The considered material is a single crystal nickel-based alloy used to make high pressure turbine blades. Only the blade root is considered so that the temperature range of interest is around 650 °C. At this temperature, the behaviour of the material is modeled by an elastoplastic behaviour. First, a volume model using Weibull density and the weakest link hypothesis integrating plasticity is built for 650 °C and several load ratios. Then, the model is also identified at 20 °C and applied to a tested blade in HCF at room temperature in order to compare the results from fatigue computation with experimental results, for validation. Finally, the limits of the model are discussed and perspectives of improvement are listed.

Place, publisher, year, edition, pages
2018. , p. 40
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:kth:diva-232525OAI: oai:DiVA.org:kth-232525DiVA, id: diva2:1237805
External cooperation
Safran Aircraft Engines
Subject / course
Solid Mechanics
Supervisors
Examiners
Available from: 2018-08-10 Created: 2018-08-10 Last updated: 2018-08-10Bibliographically approved

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