Journal of Applied Reliability (한국신뢰성학회지:신뢰성응용연구)

The Korean Reliability Society (한국신뢰성학회)
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The Study of Shot Peening Process Optimization for Reliability Improvement of an Aircraft Structural Part

항공용 구조물의 신뢰성 향상을 위한 숏피닝 공정 최적화 연구

  • 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)
  • 남용석 (국방기술품질원, 항공센터) ;
  • 정유인 (한국항공우주산업, 항공개발부) ;
  • 김화수 (항공기술연구소)
  • Received : 2017.08.21
  • Accepted : 2017.10.24
  • Published : 2017.12.25
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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

References

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