한국안전학회지 (Journal of the Korean Society of Safety)

  • 제20권4호
  • /
  • Pages.1-8
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  • 2005
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  • 1738-3803(pISSN)
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  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
권호 표지

Nb 함량에 따른 마르에이징강의 유한요소해석에 관한 연구

A Study on the FEM Analysis of Maraging Steel according to Nb content

  • 최병기 (조선대학교 기계공학과) ;
  • 최병희 (조선대학교 대학원 기계공학과) ;
  • 권택용 (전북기능대학 산업설비자동화과)
  • Choi, Byung-Ky (Department of Mechanical Enginnering, Chosun University) ;
  • Choi, Byung-Hui (Department of Mechanical Enginnering, Graduate School of Chosun University) ;
  • Kwon, Tack-Yong (Department of Automation of Industial Installation, Jeonbuk Polytechnic College)
  • 발행 : 2005.12.31
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초록

Effects of Nb(Niobium) contents and solution annealing on the strength and fatigue life of 18%Ni maraging steel commonly using in aircraft, space field, nuclear energy, and vehicle etc. were investigated. Also the fatigue life stress intensity factor were compared experiment result and FEA(finite element analysis) result. The more Nb content, the higher or the lower fatigue life on base metal specimens or solution annealed specimens showing that the fatigue lift was almost the same. The maximum stresses of X, Y, and Z axis direction showed about $2.12{\times}10^2MPa,\;4.40{\times}10^2MPa\;and\;1.32{\times}10^2MPa$ respectively. The Y direction stress showed the highest because of the same direction as the loading direction. The fatigue lives showed about 7% lower FEA result than experiment result showing almost invariable error every analyzed cycle. Stress intensity factor of the FEA result was lower about $3.5{\sim}10%$ than that of the experiment result showing that the longer fatigue crack length the higher error. It considered that the cause for the difference was the modeled crack tip having always the same shape and condition regardless of the crack growth.

키워드

참고문헌

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