liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
A low cycle fatigue life model for a shot peened gas turbine disc alloy
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-8304-0221
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
2019 (English)In: International Journal of Fatigue, ISSN 0142-1123, E-ISSN 1879-3452, Vol. 124, p. 34-41Article in journal (Refereed) Published
Abstract [en]

Turbine disks in gas turbines are subjected to cyclic load at high temperature, making, especially the fir tree type blade attachments, susceptible to fatigue. Shot peening of the fir tree attachments may be used to increase the fatigue life by introducing compressive residual stresses. In the current study, both polished and shot peened notched specimens made from alloy 718 were subjected to low cycle fatigue at 450-550 degrees C. The shot peening generally increased the fatigue life, although the effect diminished for high loads. It was shown that the effect of shot peening could be handled as mean stress effects in a life model based on a Smith-Watson-Topper (SWT) type parameter, sigma(max)Delta epsilon/2. A material model which captured the mean stress was set up to get the SWT parameter at the notch root. It was shown that thermal relaxation of residual stresses and initial strain hardening from cold work could be excluded from the finite element analysis used to establish the mean stress; this since the plasticity in the first cycle dominated the plastic deformation of the specimen. Overall, the SWT-based life model worked satisfactorily. However, the prediction of correct mean stresses at 550 degrees C proved somewhat difficult as the degree of mean stress relaxation at this temperature varies widely in available literature data.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2019. Vol. 124, p. 34-41
Keywords [en]
Gas turbine; Disc alloy; Shot peening; Fatigue; Mean stress; Life prediction
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:liu:diva-158854DOI: 10.1016/j.ijfatigue.2019.02.034ISI: 000470940100005OAI: oai:DiVA.org:liu-158854DiVA, id: diva2:1337639
Note

Funding Agencies|European Unions Horizon 2020 research and innovation programme [653941]

Available from: 2019-07-16 Created: 2019-07-16 Last updated: 2019-11-07

Open Access in DiVA

fulltext(1317 kB)6 downloads
File information
File name FULLTEXT01.pdfFile size 1317 kBChecksum SHA-512
e96ed3c878ef12881f7a586c498c7e5e79b262a80425b11bdad6367f407bd71eef76214a658f27a3bc43ccad6b4954b927d5417c56d3d6f9faafca5723135521
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Search in DiVA

By author/editor
Eriksson, RobertMoverare, JohanChen, Zhe
By organisation
Solid MechanicsFaculty of Science & EngineeringEngineering Materials
In the same journal
International Journal of Fatigue
Applied Mechanics

Search outside of DiVA

GoogleGoogle Scholar
Total: 6 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 86 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf