Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Effects of Friction Coefficient on Creep Life Assessment of Sheet

박판 크리프 수명평가에 마찰계수의 영향

  • 정지용 (한양대학교 일반대학원 자동차공학과) ;
  • 임지우 (성균관대학교 기계설계학과) ;
  • 금영탁 (한양대학교 기계공학부)
  • Received : 2010.08.16
  • Accepted : 2010.09.28
  • Published : 2010.11.01
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Abstract

The creep life of 9Cr1MoVNb steel, in terms of Larson-Miller parameter(LMP), was evaluated by small punch(SP) creep simulation and verified by uniaxial creep test. By employing the elastoplastic FEM(finite element method), the small punch creep behaviors associated with various friction coefficients were simulated to identify a real friction phenomena. The friction coefficient, ${\mu}$=0.7, determined by comparing deflection history was used in the small punch creep simulation to find the equivalent stresses with which the relationship between punch load and uniaxial creep stress was found. The creep life was then predicted by the LMP, which was the relationship among the rupture time, temperature, and stress. Finally, the LMP calculated by SP-creep simulation was compared with that had computed by the uniaxial creep test and fairly matched LMPs were found.

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References

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