Earticle

초록

영어

The residual stress analysis and fatigue test of a steel plate with a hole were performed in order to investigate the effects of the cold expansion on the fatigue life of the plate. The cold expansion methodis a metal forming process by expanding a hole in order to induce compressive tangential residual stresses near the hole. In this research, a S45C steel plate of 3.2 mm thickness with a hole of 4.318 mm diameter was cold expanded by using a mandrel, resulting in a degree of expansion 1.47%. A significant amount of compressive tangential residual stress of 502 MPa at the hole surface was calculated using the finite element analysis and the compressive residual stress was more widely spreaded in the entry and exit planes than the mid plane in the plate thickness. The compressive tangential residual stresses showed a very beneficial influence on the fatigue life of the plate by increasing 1.2 to 2 times longer lives compared to the plate without cold expansion, depending on the applied load levels. Fatigue crack initiated and propagated at the hole surface of the mandrel entrance region, where relatively lower magnitude of compressive residual stress was found than the other region.

목차

Abstract
 1. 서론
 2. 냉간 확장된 구멍을 지닌 강판의 잔류응력 분포 해석
  2.1 냉간 확장법
  2.2 유한요소법을 이용한 냉간 확장 해석
  2.3 냉간 확장에 의한 잔류응력 분포
 3. 구멍을 지닌 강판의 피로수명
  3.1 피로시험
  3.2 피로수명
 4. 결론
 References

키워드

저자

• 고승기 [ S. K. Koh | Member, Kunsan National University, School of Mechanical, Automotive and Naval Engineering ] Corresponding Author
• 연문흠 [ M. H. Yeon | VP Korea, Applied Technology Team ]

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국기계항공기술학회지(구 한국기계기술학회지) [Journal of the Korean Society of Mechanical and Aviation Technology ]

• 간기

  격월간

• pISSN

  1229-604X

• eISSN

  2508-3805

• 수록기간

  1999~2026

• 등재여부

  KCI 등재

• 십진분류

  KDC 550 DDC 620