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Spherical Indentation Techniques for Creep Property Evaluation Considering Transient Creep

천이크리프를 고려한 구형압입 크리프 물성평가법

  • Lim, Dongkyu (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Lee, Jin Haeng (Reactor Mechanical Engineering Division, Korea Atomic Energy Research Institute) ;
  • Kim, Minsoo (Dept. of Mechanical Engineering, Sogang Univ.) ;
  • Lee, Hyungyil (Dept. of Mechanical Engineering, Sogang Univ.)
  • Received : 2013.03.12
  • Accepted : 2013.08.07
  • Published : 2013.11.01

Abstract

Creep through nanoindentations has attracted increasing research attention in recent years. Many studies related to indentation creep tests, however, have simply focused on the characteristics of steady-state creep, and there exist wide discrepancies between the uniaxial test and the indentation test. In this study, we performed a computational simulation of spherical indentations, and we proposed a method for evaluating the creep properties considering transient creep. We investigated the material behavior with variation of creep properties and expressed it using regression equations for normalized variables. We finally developed a program to evaluate the creep properties considering transient creep. By using the proposed method, we successfully obtained creep exponents with an average error less than 1.1 and creep coefficients with an average error less than 2.3 from the load-depth curve.

Keywords

Transient Creep;Material Property;Spherical Indentation;FEA

Acknowledgement

Supported by : 한국연구재단

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