Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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A Study on the Deformation Characteristics of the TYPE 1 42.6 Liter Hydrogen Storage Vessel with Notches

노치가 형성된 TYPE 1 42.6리터 수소저장용기의 거동 특성 연구

  • Seunghyun Cho (Department of mechanical engineering, Dongyang Mirae University) ;
  • Ha Young Choi (Department of mechanical engineering, Dongyang Mirae University) ;
  • Sung Kwang Byon (Department of mechanical engineering, Dongyang Mirae University) ;
  • Jung Hee Seo (Department of mechanical engineering, Dongyang Mirae University) ;
  • Oh Hyun Chung (Koran gas safety corporation) ;
  • MinJoo Kim (Koran gas safety corporation) ;
  • Min Kyung Lee (Koran gas safety corporation)
  • 조승현 (동양미래대학교 기계공학부) ;
  • 최하영 (동양미래대학교 기계공학부) ;
  • 변성광 (동양미래대학교 기계공학부) ;
  • 서정희 (동양미래대학교 기계공학부) ;
  • 정오현 (한국가스안전공사) ;
  • 김민주 (한국가스안전공사) ;
  • 이민경 (한국가스안전공사)
  • Received : 2024.02.16
  • Accepted : 2024.07.27
  • Published : 2024.09.30
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Abstract

In order to investigate the deformation and stress characteristics of the gas pressure applied to the 42.6-liter small hydrogen gas storage vessel with a notch, the von Mises stress generated in the hydrogen gas storage vessel was interpreted using the finite element method. The stress-strain characteristics and fatigue strength of the SA372 J Grade material applied to the analysis were measured through the fatigue-tensile test. In addition, the gas pressure was considered in 30 charging cycles, and it was assumed that the notch was located in two areas, the shoulder and the center of the storage vessel. The maximum VMS occurs at the longitudinal notch of the inner surface of the storage vessel, and VMS generated in the longitudinal notch of the inner surface was 1.02 times the permanent life strength of 550 MPa, and 0.87 times the yield strength of 650 MPa occurred. On the other hand, in the case of the circumferential notch, VMS below the permanent life strength occurred both inside and outside the storage vessel.

본 논문에서는 노치가 형성된 42.6리터 소형 수소가스 저장용기에 가해지는 가스압력에 의한 거동특성을 평가하기 위해 수소가스 저장용기내 본 미세스 응력(VMS)을 수치해석으로 분석하였다. 해석에 적용된 SA372 J Grade 재료의 응력-변형률 특성과 피로강도는 피로-인장시험을 통해 측정되었다. 또한, 가스압력은 30회 충전 사이클 형태로 고려하였고, 노치는 저장용기의 어깨(shoulder)와 가운데(body)의 2개 영역에 위치한다고 가정하였다. 해석결과에 따르면 최대 VMS는 저장용기 가운데 위치 내부표면의 길이방향 노치에서 발생하며, 내부표면의 길이방향 노치에서 발생하는 VMS는 영구수명 강도인 550MPa의 1.02배이고, 항복강도 650 MPa의 0.87배가 발생하였다. 반면 원주방향 노치의 경우는 저장용기의 내부와 외부에서 모두 영구수명 강도 이하의 VMS가 발생하였다.

Keywords

Acknowledgement

본 연구는 2024년도 산업통상자원부의 재원으로 한국에너지기술평가원(KETEP)의 연구비 지원으로 수행되었으며, 지원에 감사를 드립니다(NO. 20215810100040).

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