Inelastic behavior investigation of Mod.9Cr-1Mo steel in high temperature = Mod.9Cr-1Mo강에 대한 고온 비탄성 거동 연구

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Mod. 9Cr-1MO Steel is a candidate material of the steam generator pipe and IHX tubes in SFR reactor. Those piping components are subjected to repeated thermal stress as a results of temperature gradients during plant cooling down or heating. It makes ratcheting and creep-fatigue behavior and cause failure to piping components. Therefore simulation of inelastic behavior is needed to investigate inelastic and ratcheting behavior for structure integrity evaluation and lifetime prediction. To investigate the inelastic behavior of a modified 9Cr-1Mo steel, uniaxial stress controlled ratcheting tests and strain controlled cyclic tests were conducted at $500\degC$, $550\degC$, $600\degC$. Modified 9Cr-1Mo steel exhibits cyclic softening and ratcheting behaviors at the temperature ranges tested. Based on the cyclic test results, isotropic hardening behavior and kinematic hardening behavior depending on the temperature were incorporated into the constitutive model. An inelastic behavior simulation is conducted using the Chaboche three-decomposed constitutive model. From the parameter identification simulation, each kinematic parameter and isotropic parameter are obtained. And ratcheting simulation are verified from the ratcheting test and strain controlled cyclic test result.
Advisors
Jang, Chang-Heeresearcher장창희researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2010
Identifier
419086/325007  / 020083038
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 원자력및양자공학과, 2010.2, [ vi, 45 p ]

Keywords

라체팅; 9크롬강; 비탄성 거동; inelastic behavior; Ratcheting; Mod.9Cr-1Mo

URI
http://hdl.handle.net/10203/49564
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=419086&flag=dissertation
Appears in Collection
NE-Theses_Master(석사논문)
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