Inelastic Material Models of Type 316H for Elevated Temperature Design of Advanced High Temperature Reactors

Gyeong-Hoi Koo and Ji-Hyun Yoon
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Gyeong-Hoi Koo: Korea Atomic Energy Research Institute, Daejeon 34057, Korea
Ji-Hyun Yoon: Korea Atomic Energy Research Institute, Daejeon 34057, Korea

Energies, 2020, vol. 13, issue 17, 1-13

Abstract: In this paper, the inelastic material models for Type 316H stainless steel, which is one of the principal candidate materials for elevated temperature design of the advanced high temperature reactors (HTRs) pressure retained components, are investigated and the required material parameters are identified to be used for both elasto-plastic models and unified viscoplastic models. In the constitutive equations of the inelastic material models, the kinematic hardening behavior is expressed with the Chaboche model with three backstresses, and the isotropic hardening behavior is expressed by the Voce model. The required number of material parameters is minimized to be ten in total. For the unified viscoplastic model, which can express both the time-independent plastic behavior and the time-dependent viscous behavior, the constitutive equations have the same kinematic and isotropic hardening parameters of the elasto-plastic material model with two additional viscous parameters. To identify the material parameters required for these constitutive equations, various uniaxial tests were carried out at isothermal conditions at room temperature and an elevated temperature range of 425–650 °C. The identified inelastic material parameters were validated through the comparison between tests and calculations.

Keywords: Type 316H; inelastic material model; material parameter; elasto-plastic; viscoplastic; elevated temperature; nuclear power; kinematic hardening; isotropic hardening (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
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