Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Small Punch Creep Behavior Analysis for Assessment of Creep Properties

크리프 물성 평가를 위한 소형 펀치 크리프 해석

  • Im, Jiwoo (Material Strength & Computational Bioengineering Lab, School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Bum-Joon (Material Strength & Computational Bioengineering Lab, School of Mechanical Engineering, Sungkyunkwan University) ;
  • Kim, Moon-K (Material Strength & Computational Bioengineering Lab, School of Mechanical Engineering, Sungkyunkwan University) ;
  • Lim, Byeong-Soo (Material Strength & Computational Bioengineering Lab, School of Mechanical Engineering, Sungkyunkwan University)
  • 임지우 (성균관대학교 기계공학부, 재료강도 및 계산생명공학 실험실) ;
  • 김범준 (성균관대학교 기계공학부, 재료강도 및 계산생명공학 실험실) ;
  • 김문기 (성균관대학교 기계공학부, 재료강도 및 계산생명공학 실험실) ;
  • 임병수 (성균관대학교 기계공학부, 재료강도 및 계산생명공학 실험실)
  • Received : 2010.05.24
  • Published : 2010.11.25
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Abstract

The small punch creep (SPC) test has recently received much attention as a new alternative to the conventional uniaxial creep test because it needs only a miniature-sized specimen directly detached from an operating system or component without any serious sampling damages. However, it is difficult to obtain the equivalent uniaxial creep data directly from the SPC data. As a specimen is deformed by a punch in the SPC test, the test result is sensitive to the friction between them. Finite element analyses with various friction coefficients was performed and showed a tendency of increased SPC life with an increased friction coefficient. The necking position predicted by the SPC simulation with a proper friction coefficient showed good agreement with that observed from the real SPC test. Finally, a noble method to convert the SPC load and displacement rate into the equivalent uniaxial creep stress and strain rate, respectively, was established in this study.

Keywords

Acknowledgement

Supported by : 기초전력연구원

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