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The Study of Shot Peening Process Optimization for Reliability Improvement of an Aircraft Structural Part  

Nam, Yong-Seog (Aeronautical Center, Defence Agency for Technology and Quality)
Jeong, Yoo-In (Aircraft R&D Division, Korea Aerospace Industries, Ltd.)
Kim, Hwa-Soo (Aero Technology Research Institute Daegu)
Publication Information
Journal of Applied Reliability / v.17, no.4, 2017 , pp. 325-331 More about this Journal
Abstract
Purpose: There is active research that improves both reliability and fatigue life of structures which widely used in the aerospace fields of defense industry. The effects of three parameters (pressure, peening time, nozzle distance) on Almen intensity and coverage will be investigated by using the experimental and analyzed data. Methods: we employed a Box-Behnken design. Additionally, to verify the validity of the optimal condition obtained from experimental results, metallurgical analyses of the shot-peened aerospace part were conducted with respect to surface morphology, residual stress. Results: Optimal shot peening condition is determined as (distance, pressure, time) by optimizing simultaneously the two responses of intensity and coverage. At the optimal peening condition the prediction interval for Almen intensity is well within the required range. And, the validity of the condition was checked by using the real aerospace aluminum alloy plate. Conclusion: Shot peening introduces significant levels of compressive residual stress and induces improves both reliability and fatigue life of structures.
Keywords
Shot Peening; Almen Intensity; Surface Coverage; Response Surface Methodology;
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