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논문 상세정보

크리프 균열 성장 실험을 위한 소성 변위 결정법

Plastic Displacement Estimates in Creep Crack Growth Testing

Abstract

The ASTM test standard recommends the use of the compact tension specimen for creep crack growth rates measurement. In the creep crack growth rate test, the displacement rate due to creep is obtained by subtracting the contribution of elastic and plastic components from the total load line displacement rate based on displacement partitioning method fur determining $C^*-integral$, which involves Ramberg-Osgood (R-O) fitting procedures. This paper investigates the effect of the R-O fitting procedures on plastic displacement rate estimates in creep crack growth testing, via detailed two-dimensional and three-dimensional finite element analyses of the standard compact tension specimen. Four different R-O fitting procedures are considered; (i) fitting the entire true stress-strain data up to the ultimate tensile strength, (ii) fitting the true stress-strain data from 0.1% strain to 0.8 of the true ultimate strain, (iii) fitting the true stress-strain data only up to 5% strain, and (iv) fitting the engineering stress-strain data. It is found that the last two procedures provide reasonably accurate plastic displacement rates and thus should be recommended in creep crack growth testing. Moreover, several advantages of fitting the engineering stress-strain data over fitting the true stress-strain data only up to 5% strain are discussed.

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참고문헌 (20)

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이 논문을 인용한 문헌 (2)

  1. Jung, Won-Taek ; Kong, Yu-Sik ; Kim, Seon-Jin 2009. "New Considerations on Variability of Creep Rupture Data and Life Prediction" 大韓機械學會論文集. Transactions of the Korean Society of Mechanical Engineers. A. A, 33(10): 1119~1124 
  2. Jung, Won-Taek ; Kong, Yu-Sik ; Kim, Seon-Jin 2010. "Variability of Short Term Creep Rupture Time and Life Prediction in Stainless Steels" 韓國海洋工學會誌 = Journal of ocean engineering and technology, 24(6): 97~102 

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