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

The Korean Society of Mechanical Engineers (대한기계학회)
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Creep Design of Type 316LN Stainless Steel by K-R Damage Theory

K-R 손상이론에 의한 316LN 스테인리스강의 크리프 설계

  • Kim, U-Gon (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute) ;
  • Kim, Dae-Hwan (Nuclear Fuel Technology Center, Korea Atomic Energy Research Institute) ;
  • Ryu, U-Seok
  • 김우곤 (한국원자력연구소 원자력재료기술개발팀) ;
  • 김대환 (한국원자력연구소 원자력재료기술개발팀) ;
  • 류우석
  • Published : 2001.02.01
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Abstract

Kachanov-Rabotnov(K-R) creep damage theory was reviewed, and applied to design a creep curve for type 316LN stainless steel. Seven coefficients used in the theory, i.e., A, B, k, m, λ, r, and q were determined, and their physical meanings were analyzed clearly. In order to quantify a damage parameter ($\omega$), cavity amount was measured in the crept specimen taken from interrupted creep test with time variation, and then the amount was reflected into K-R damage equations. Coefficient λ, which is regarded as a creep tolerance feature of a material, increased with creep strain. Mater curve with λ=2.8 was well coincided with an experimental one to the full lifetime. The relationship between damage parameter and life fraction was matched with the theory at exponent ${\gamma}$=24 value. It is concluded that K-R damage equation was reliable as the modelling equation for type 316LN stainless steel. Coefficient data obtained from type 316LN stainless steel can be utilized for life prediction of operating material.

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References

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