Surface enhancement techniques such as shot peening are extensively used to increase the fatigue life of components in gas turbine engines. Due to the combined thermomechanical nature of the loading encountered within an engine, aeroengine designers have avoided incorporating the beneficial effects in their analysis. This can lead to overdesign and early retirement of critical engine components. A finite element modeling procedure is introduced that incorporates the shot peening residual stresses on a fir-tree turbine disk assembly. Unlike traditional equivalent loading approaches, the method models the actual impact of shots on the assembly and is the first time this approach is used to introduce peening residual stresses in turbine disks. In addition, the stability of these residual stresses in response to cyclic thermomechanical loadings at the contact interface is also studied. The results reveal that thermomechanical overload can nearly fully relax the shot peening residual stresses within the first cycle due to the combined effects of decreased material yield strength and plastic deformation. This work will enable aeroengine designers to assess critical surface treated components for structural integrity, optimal design, and residual life.
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July 2015
Research-Article
Finite Element Modeling of Shot Peening Residual Stress Relaxation in Turbine Disk Assemblies
S. A. Meguid,
S. A. Meguid
1
Professor
Fellow ASME
Mechanics and Aerospace Design Laboratory,
Mechanical and Industrial Engineering,
e-mail: meguid@mie.utoronto.ca
Fellow ASME
Mechanics and Aerospace Design Laboratory,
Mechanical and Industrial Engineering,
University of Toronto
,5 King's College Road
,Toronto, ON M5S 3G8
, Canada
e-mail: meguid@mie.utoronto.ca
1Corresponding author.
Search for other works by this author on:
Luke A. Maricic
Luke A. Maricic
Mechanics and Aerospace Design Laboratory,
Mechanical and Industrial Engineering,
Mechanical and Industrial Engineering,
University of Toronto
,5 King's College Road
,Toronto, ON M5S 3G8
, Canada
Search for other works by this author on:
S. A. Meguid
Professor
Fellow ASME
Mechanics and Aerospace Design Laboratory,
Mechanical and Industrial Engineering,
e-mail: meguid@mie.utoronto.ca
Fellow ASME
Mechanics and Aerospace Design Laboratory,
Mechanical and Industrial Engineering,
University of Toronto
,5 King's College Road
,Toronto, ON M5S 3G8
, Canada
e-mail: meguid@mie.utoronto.ca
Luke A. Maricic
Mechanics and Aerospace Design Laboratory,
Mechanical and Industrial Engineering,
Mechanical and Industrial Engineering,
University of Toronto
,5 King's College Road
,Toronto, ON M5S 3G8
, Canada
1Corresponding author.
Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received February 16, 2014; final manuscript received March 5, 2015; published online March 30, 2015. Assoc. Editor: Ashraf Bastawros.
J. Eng. Mater. Technol. Jul 2015, 137(3): 031003 (8 pages)
Published Online: July 1, 2015
Article history
Received:
February 16, 2014
Revision Received:
March 5, 2015
Online:
March 30, 2015
Citation
Meguid, S. A., and Maricic, L. A. (July 1, 2015). "Finite Element Modeling of Shot Peening Residual Stress Relaxation in Turbine Disk Assemblies." ASME. J. Eng. Mater. Technol. July 2015; 137(3): 031003. https://doi.org/10.1115/1.4030066
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