Experimental and numerical investigation of the effects of shot peening on low-cycle fatigue behaviour of notched geometries
Experimental and numerical investigation of the effects of shot peening on low-cycle fatigue behaviour of notched geometries
In service, turbine components are subjected to low-cycle fatigue (LCF) during start-up and shut-down operations, especially at the fir tree root blade-disc connection which has a complex geometry and corresponding high stress concentration. Shot peening generates compressive residual stress (CRS) and strain hardening which can improve fatigue life. However, prediction of the fatigue life of shot-peened components under LCF is challenging due to the complex interaction between the shot peening induced effects and service conditions, especially in regions of high stress concentration. The current study aims to develop a validated 3-D eigenstrain-based modelling tool, which is capable of simulating the stress/strain evolution under LCF in shot-peened notched samples representative of the real turbine blade fir tree geometry. The residual stress and strain hardening profiles caused by shot peening were first evaluated by experiments and then incorporated into the finite element (FE) model separately. In addition, the Smith – Watson – Topper (SWT) method was used to predict the fatigue life of shot peened samples, based on the stress/strain data generated using the developed FE model.
You, Chao
1970d34b-ab33-4098-9363-2df30f36dda1
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Soady, Katherine
683b0e6c-6cbf-463c-8d57-c0db32bc0984
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
16 September 2015
You, Chao
1970d34b-ab33-4098-9363-2df30f36dda1
Achintha, Mithila
8163c322-de6d-4791-bc31-ba054cc0e07d
Soady, Katherine
683b0e6c-6cbf-463c-8d57-c0db32bc0984
Reed, Philippa
8b79d87f-3288-4167-bcfc-c1de4b93ce17
You, Chao, Achintha, Mithila, Soady, Katherine and Reed, Philippa
(2015)
Experimental and numerical investigation of the effects of shot peening on low-cycle fatigue behaviour of notched geometries.
9th International Charles Parsons Turbine and Generator Conference, Loughborough, United Kingdom.
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Abstract
In service, turbine components are subjected to low-cycle fatigue (LCF) during start-up and shut-down operations, especially at the fir tree root blade-disc connection which has a complex geometry and corresponding high stress concentration. Shot peening generates compressive residual stress (CRS) and strain hardening which can improve fatigue life. However, prediction of the fatigue life of shot-peened components under LCF is challenging due to the complex interaction between the shot peening induced effects and service conditions, especially in regions of high stress concentration. The current study aims to develop a validated 3-D eigenstrain-based modelling tool, which is capable of simulating the stress/strain evolution under LCF in shot-peened notched samples representative of the real turbine blade fir tree geometry. The residual stress and strain hardening profiles caused by shot peening were first evaluated by experiments and then incorporated into the finite element (FE) model separately. In addition, the Smith – Watson – Topper (SWT) method was used to predict the fatigue life of shot peened samples, based on the stress/strain data generated using the developed FE model.
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Experimental and Numerical Investigation of the Effects of Shot Peening on Low-Cycle Fatigue Behaviour of Notched Geometries.pdf
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Published date: 16 September 2015
Venue - Dates:
9th International Charles Parsons Turbine and Generator Conference, Loughborough, United Kingdom, 2015-09-16
Organisations:
Engineering Mats & Surface Engineerg Gp
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Local EPrints ID: 381262
URI: http://eprints.soton.ac.uk/id/eprint/381262
PURE UUID: cc09c4a4-2b7c-4eee-bf5d-5c0ac965c978
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Date deposited: 23 Sep 2015 16:02
Last modified: 15 Mar 2024 02:45
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Author:
Chao You
Author:
Mithila Achintha
Author:
Katherine Soady
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