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Quantification of R-ratio effect on J-integral under large-amplitude cyclic loading condition

큰 진폭의 반복하중 조건에서 R-ratio에 따른 J-적분 정량화

  • Received : 2016.08.03
  • Accepted : 2016.12.13
  • Published : 2016.12.30

Abstract

This paper presents a method to quantify R-ratio effect on J-integral under large-amplitude cyclic loading condition. Generally, monotonic tearing resistance curves are used to assess stability of cracked nuclear piping under seismic loading. However, it is well known that fracture toughness decrease at cyclic loading condition, according to R-ratio. For this reason, it is important to quantify the J-R curves under cyclic loading condition. To quantify the R-ratio effect, correction method which was proposed by Tranchand is considered. This method considers crack opening area in order to calculate modified J-integral. This method leads to an increase of fracture toughness. At R=-0.5 case, this method is good agreement with monotonic J-R curves. However, results show that this method has a limit to apply a large R-ratio case.

Keywords

References

  1. B.Tranchand, S. Chapuliot, V. Aubin, S. Marie, M. Bourgeois, 2014, "Ductile fracture analysis under large amplitude cycles", ASME PVP conference, PVP 2014-28426
  2. K. Mogami, T. Hayashi, K. Ando, N. Ogura, 1990, "Elastic-plastic fatigue-crack growth and tearing instability behavior under cyclic loads", International Journal of Pressure Vessels and Piping, Vol. 44, pp. 85-97. https://doi.org/10.1016/0308-0161(90)90008-6
  3. C.S. Sek, K.L. Murty, 2000, "A study on the decrease of fracture resistance curve under reversed cyclic loading", International Journal of Pressure Vessels and Piping, Vol. 77, pp. 303-311. https://doi.org/10.1016/S0308-0161(00)00018-1
  4. P.K. Singh, V.R. Ranganath, S. Tarafder, Prabha Prasad, V. Bhasin, K.K. Vaze, H.S. Kushwaha, 2003, "Effect of cyclic loading on elastic-plastic fracture resistance of PHT system piping material of PHWR", International Journal of Pressure Vessels and Piping, Vol. 80, pp. 745-752. https://doi.org/10.1016/S0308-0161(03)00133-9
  5. J.W. Kim, M. R. Choi, Y. J. Kim, "Effect of loading rate on the fracture behavior of nuclear piping materials under cyclic loading condition", Nuclear Engineering and Technology, Vol. 48, pp. 1376-1386.
  6. ASTM, 2011, "Standard test method for measurement of fracture toughness", E1820-11, American Society for Testing and Material
  7. ABAQUS 6.13. User's Manual, 2013, Dassault Systems
  8. F. Dunne, N. Petrinic, 2005, "Introduction to computational plasticity", Oxford University Press.
  9. J. L. Chaboche, 1986, "Time-independent constitutive theories for cyclic plasticity", International Journal of Plasticity, Vol. 2, No. 2, pp. 149-188. https://doi.org/10.1016/0749-6419(86)90010-0
  10. J. L. Chaboche, 1989, "Constitutive equations for cyclic plasticity and cyclic viscoplasticity", International Journal of Plasticity, Vol. 5, No. 3, pp. 247-302. https://doi.org/10.1016/0749-6419(89)90015-6