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Research Papers: Gas Turbines: Structures and Dynamics

Analytical Model to Predict Thermomechanical Relaxation of Shot Peening Induced Residual Stresses

[+] Author and Article Information
Min Huang1

Energy and Propulsion Technologies, General Electric Global Research Center, Niskayuna, NY 12309minhuang@alumni.princeton.edu

Yogesh K. Potdar, Srikanth Akkaram

Energy and Propulsion Technologies, General Electric Global Research Center, Niskayuna, NY 12309

1

Corresponding author.

J. Eng. Gas Turbines Power 132(9), 092505 (Jun 21, 2010) (5 pages) doi:10.1115/1.4000623 History: Received July 26, 2009; Revised August 11, 2009; Published June 21, 2010; Online June 21, 2010

Shot peening is widely used to improve the fatigue life of engine blades and rotors by inducing compressive residual stress on component surfaces. However, the residual stresses can relax due to exposure at high service temperature and mechanical loading. A physics-motivated analytical solution is developed to predict the residual stress relaxation at high temperature and under mechanical loading. In this thermomechanical relaxation model, the plastic strains in the shot peening layer and the substrate are obtained analytically by using linear kinematic hardening material law, and the plastic strain evolution at high temperature is modeled by using a recovery strain term. The final residual stress as a function of time, temperature, and mechanical loading is obtained analytically by combining this recovery strain with equilibrium and compatibility conditions. The whole method can be implemented into Microsoft Excel, and is easy to use and validate. As a special case, an analytical closed-form solution to predict the pure thermal relaxation of a shot peening residual stress is developed. The model predictions agree satisfactorily with published experimental measurements.

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Copyright © 2010 by American Society of Mechanical Engineers
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Figures

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Figure 1

Schematic structure of a thin shot peening layer film on a semi-infinitely large flat component substrate

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Figure 2

Comparison between model prediction and experimental measurements for normalized residual stress profiles: (a) pure thermal relaxation and (b) thermomechanical relaxation

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Figure 3

Effects of temperature and time on the pure thermal relaxation of a shot peening induced residual stress. The numbers in the plot are different temperatures.

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Figure 4

Effects of applied mechanical strain and yield strength on the mechanical relaxation of a shot peening induced residual stress. The numbers in the plot are different yield strengths.

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