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http://dx.doi.org/10.3795/KSME-A.2013.37.10.1229

A Numerical Approach to Spherical Indentation Techniques for Creep Property Evaluation  

Lim, Dongkyu (Dept. of Mechanical Engineering, Sogang Univ.)
Lee, Jin Haeng (Reactor Mechanical Engineering Division, Korea Atomic Energy Research Institute)
Choi, Youngsick (Dept. of Mechanical Engineering, Sogang Univ.)
Lee, Hyungyil (Dept. of Mechanical Engineering, Sogang Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.37, no.10, 2013 , pp. 1229-1237 More about this Journal
Abstract
In this study, the theory of spherical indentation based on incremental plasticity is extended to an indentation method for evaluating creep properties. Through finite element analysis (FEA), the point where the elastic strain effect is negligible and the creep strain gradient constant is taken as the optimum point for obtaining the equivalent strain rate and stress. Based on FE results for spherical indentation with various values of creep exponent and creep coefficient, we derive by regression an equation to calculate creep properties using two normalized variables. Finally a program is generated to calculate creep exponent and creep coefficient. With this method, we obtain from the load-depth curve creep exponents with an average error of less than 1.5 % and creep coefficients with an average error of less than 1.0 %.
Keywords
Creep; Material Property; Spherical Indentation; FEA;
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