Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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Residual Stress Estimation and Fatigue Life Prediction of an Autofrettaged Pressure Vessel

자긴가공된 압력용기의 잔류응력 평가 및 피로수명 예측

  • Song, Kyung Jin (School of Mechanical Convergence System Engineering, Kunsan Nat'l Univ.) ;
  • Kim, Eun Kyum (School of Mechanical Convergence System Engineering, Kunsan Nat'l Univ.) ;
  • Koh, Seung Kee (School of Mechanical Convergence System Engineering, Kunsan Nat'l Univ.)
  • 송경진 (군산대학교 기계융합시스템공학부) ;
  • 김은겸 (군산대학교 기계융합시스템공학부) ;
  • 고승기 (군산대학교 기계융합시스템공학부)
  • Received : 2017.02.24
  • Accepted : 2017.05.02
  • Published : 2017.09.01
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Abstract

Fatigue failure of an autofrettaged pressure vessel with a groove at the outside surface occurs owing to the fatigue crack initiation and propagation at the groove root. In order to predict the fatigue life of the autofrettaged pressure vessel, residual stresses in the autofrettaged pressure vessel were evaluated using the finite element method, and the fatigue properties of the pressure vessel steel were obtained from the fatigue tests. Fatigue life of a pressure vessel obtained through summation of the crack initiation and propagation lives was calculated to be 2,598 cycles for an 80% autofrettaged pressure vessel subjected to a pulsating internal pressure of 424 MPa.

외경에 홈이 존재하는 자긴가공된 압력용기의 피로 파손은 외경 홈에서의 피로균열 발생과 전파에 의해 발생한다. 자긴가공된 압력용기의 피로수명을 예측하기 위하여 유한요소법을 이용하여 자긴가공에 의한 잔류응력해석을 수행하였으며, 피로시험을 통하여 재료의 피로특성을 구하였다. 압력용기의 수명은 압력용기 외경 홈 모서리에서 응력 및 변형률 집중에 의한 피로균열의 생성수명과 전파수명의 합으로 총 수명이 계산되었다. 본 연구에서 80 % 자긴도의 압력용기가 424 MPa의 반복적인 내압을 받을 때 압력용기의 수명은 2,598 사이클로 예측되었다.

Keywords

References

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