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Creep Design of Type 316LN Stainless Steel by K-R Damage Theory
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 Title & Authors
Creep Design of Type 316LN Stainless Steel by K-R Damage Theory
Kim, U-Gon; Kim, Dae-Hwan; Ryu, U-Seok;
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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 (), 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 =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.
 Keywords
Damage Parameter;316LN Stainless Steel;Kachanov-Rabotnov Creep Damage;Monkman-Grant Strain;Creep Rate;Creep Cavity;
 Language
Korean
 Cited by
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