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http://dx.doi.org/10.5228/KSTP.2010.19.7.435

Effects of Friction Coefficient on Creep Life Assessment of Sheet  

Jeong, J.Y. (한양대학교 일반대학원 자동차공학과)
Im, J.W. (성균관대학교 기계설계학과)
Keum, Y.T. (한양대학교 기계공학부)
Publication Information
Transactions of Materials Processing / v.19, no.7, 2010 , pp. 435-440 More about this Journal
Abstract
The creep life of 9Cr1MoVNb steel, in terms of Larson-Miller parameter(LMP), was evaluated by small punch(SP) creep simulation and verified by uniaxial creep test. By employing the elastoplastic FEM(finite element method), the small punch creep behaviors associated with various friction coefficients were simulated to identify a real friction phenomena. The friction coefficient, ${\mu}$=0.7, determined by comparing deflection history was used in the small punch creep simulation to find the equivalent stresses with which the relationship between punch load and uniaxial creep stress was found. The creep life was then predicted by the LMP, which was the relationship among the rupture time, temperature, and stress. Finally, the LMP calculated by SP-creep simulation was compared with that had computed by the uniaxial creep test and fairly matched LMPs were found.
Keywords
Creep; Small Punch Creep Test; Uniaxial Creep Test; Larson-Miller Parameter(LMP); Friction Coefficient; 9Cr1MoVNb;
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Times Cited By KSCI : 2  (Citation Analysis)
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