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http://dx.doi.org/10.3795/KSME-A.2011.35.2.157

Creep-Fatigue Life Design with Various Stress and Temperature Conditions on the Basis of Lethargy Coefficient  

Park, Jung-Eun (Dept. of Mechanical System Engineering, Chonbuk Nat'l Univ.)
Yang, Sung-Mo (Dept. of Mechanical System Engineering, Chonbuk Nat'l Univ.)
Han, Jae-Hee (Dept. of Mechanical System Engineering, Chonbuk Nat'l Univ.)
Yu, Hyo-Sun (Dept. of Mechanical System Engineering, Chonbuk Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.35, no.2, 2011 , pp. 157-162 More about this Journal
Abstract
High temperature and stress are encounted in power plants and vehicle engines. Therefore, determination of the creep-fatigue life of a material is necessary prior to fabricating equipments. In this study, life design was determined on the basis of the lethargy coefficient for different temperatures, stress and rupture times. SP-Creep test data was compared with computed data. The SP-Creep test was performed to obtain the rupture time for X20CrMoV121 steel. The integration life equation was considered for three cases with various load, temperature and load-temperature. First, the lethargy coefficient was calculated by using the obtained rupture stress and the rupture time that were determined by carrying out the SP-Creep test. Next, life was predicted on the basis of the temperature condition. Finally, it was observed that life decreases considerably due to the coupling effect that results when fatigue and creep occur simultaneously.
Keywords
Coupling Effect; Creep-Fatigue; High Cr-Mo Steel; Integration Life Equation; Lethargy Coefficient;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
Times Cited By SCOPUS : 0
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