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http://dx.doi.org/10.7842/kigas.2021.25.6.14

A Study on the Fracture Behavior of a Crack in 9% Ni Steel Considering Constraint Effect  

Kim, Young Kyun (Gas Research Institute, KOGAS)
Yoon, Ihn soo (Gas Research Institute, KOGAS)
Kim, Jae Hoon (Dept. of Mechanical Design Engineering, Chungnam National University)
Publication Information
Journal of the Korean Institute of Gas / v.25, no.6, 2021 , pp. 14-21 More about this Journal
Abstract
Inner shell material of LNG storage tanks that store ultra-low temperature LNG at -162℃ requires structural integrity assessment of a crack-like defect. From the viewpoint of conventional fracture mechanics, the assessment has mainly performed by single parameter using stress intensity factor K, J-integral and CTOD. However, the stresses in a material of crack tip are not unique caused by constraint loss due to size and geometry of the structure. Various attempts have been made to complement a single parameter fracture mechanics, typically with Q-stress. In this paper, we have performed a two-parameter approach by deriving the Q-stress coupling with J-integral suitable for the evaluation of the crack tip stress field in the non-linear elastic region. A quantitative evaluation of the constraint effect has performed by using the J-Q approach. It was evaluated that the SENB type specimen had a crack ratio of 0.1 to 0.7 and the wide type specimen had a crack ratio of 0.2 to 0.6.
Keywords
crack-tip; 9% Ni steel; constraint effect; Q stress; J-Q approach; FE analysis;
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1 N.P. O'Dowd and C.F. Shih, "Family of Crack Tip Fields Characterized by a Triaxiality Parameter-I, Structure of Fields", Journal of Mechanics and Physics of Solids, 39(8), 989-1015, (1991)   DOI
2 Y. Shi, S. Sun, H. Murakawa and Y. Ueda, "Finite Element Analysis on Relationships Between the J-Integral and CTOD for Stationary Cracks in Welded Tensile Specimens", Int. J. Pressure Vessels Piping, 75(3), 197-202, (1998)   DOI
3 S. K. Kudari, and K. G. Kodancha, "On the Relationship Between J-Integral and CTOD for CT and SENB Specimens", Fratt. Integrita Strutturale, 2(6), 3-10, (2008)   DOI
4 ASTM International, "Standard Test Method for Measurement of Fracture Toughness", Report No. ASTM E1820-09, (2009)
5 Y. J. Kim, N.S. Huh and Y.J. Kim, "On Relevant Ramberg-Osgood Fit to Engineering Non-Linear Fracture Mechanics Analysis", Transactions of the Korean Society of Mechanical Engineers. A., .27(9), 1571 - 1578, (2004)
6 N.P. O'Dowd and C.F. Shih, "Family of Crack Tip Fields Characterized by a Triaxiality Parameter-II, Fracture Applications", Journal of Mechanics and Physics of Solids, 40(5), 939-963, (1992)   DOI
7 J.H.Je, D.J. Kim, Y.J. Kim, "Crack-tip Stress Field of Fully Circumferential Surface Cracked Pipe Under Combined Tension and Thermal Loads", Trans. Korean Soc. Mech. Eng. A, 38(11), 1207-1214, (2014)   DOI
8 YK. Kim, B.T. Oh and J. H. Kim, "Effects of Crack Tip Constraint on the Fracture Toughness Assessment of 9% Ni Steel for Cryogenic Application in Liquefied Natural Gas Storage Tanks", MDPI Materials, 13(22), 5250, (2020)
9 J.W. Hutchinson, "Singular Behavior of End of a Tensile Crack Tip in a Hardening Material", Journal of the Mechanics and Physics of Solids, 16(1), 13-31, (1968)   DOI
10 J.R. Rice and G.F. Rosengren, "Plane Strain Deformation near a Crack Tip in a Power-Law Hardening Material", Journal of the Mechanics and Physics of Solids, 16(1), 1-12, (1968)   DOI
11 J. Joyce, E. Hackett, and C. Roe, "Effects of Crack Depth and Mode of Loading on the J-R Curve Behavior of a High-Strength Steel in Constraint Effects in Fracture," ASTM STP1171, 239-263, (1993)
12 N.P. O'Dowd and C.F. Shih, "Family of Crack Tip Fields Characterized by a Triaxiality Parameter-I, Structure of Fields", Journal of Mechanics and Physics of Solids, 39(8), 989-1015, (1991)   DOI
13 N.P. O'Dowd and C.F. Shih, "Family of Crack Tip Fields Characterized by a Triaxiality Parameter-II, Fracture Applications", Journal of Mechanics and Physics of Solids, 40(5), 939-963, (1992)   DOI