Abstract
Curved wide plate (CWP) and single edge notched tension (SENT) tests are commonly considered for determining the fracture toughnesses of high-strength line-pipe steel for the strain-based design. However, the tearing resistance relationship between these tests and actual thin-walled surface-cracked pipe has not been clearly established. The purpose of this study is to compare the crack growth characteristics of actual pipe, CWP and SENT using the local damage method, which is based on the Gurson-Tvergaard-Needleman (GTN) model. Small-scale testing of smooth round bar tensile and SENT specimens provides the information required to calibrate the damage parameters of the GTN model. Crack growth simulations are then conducted using the calibrated GTN model to evaluate the tearing resistance behaviors of various geometries. The tearing resistances of the CWP and the actual pipe are similar, whereas the SENT specimen exhibits a higher stress triaxiality. However, this tendency of SENT specimen changes as the crack propagates, which is related to the conservatism of the crack growth resistance curve. Therefore, it is necessary to identify the SENT test specimen usability and limitation via ductile damage simulations.
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08 October 2019
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Abbreviations
- J :
-
J-integral
- Δa :
-
Crack growth length
- a 0 :
-
Initial crack depth
- K :
-
Strength coefficient
- n :
-
Strain hardening coefficient
- σ :
-
Stress
- B :
-
Thickness of SENT specimen
- t :
-
Wall-thickness of CWP specimen and pipe
- W :
-
Width of SENT and CWP specimens
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Acknowledgments
The Korea Gas Corporation (KOGAS) Research Institute supported this research through Grant RD2017-0021.
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Recommended by Associate Editor Nam-Su Huh
Youn-Young Jang is a Ph.D candidate in Mechanical System Design Engineering at Seoul National Univ. of Science and Technology, Korea. He received B.S. and M.S. in Mechanical Engineering at Seoul Nat’l Univ. of Science and Technology in 2015 and 2017, respectively. His research interests include strain-based assessments and computational fracture mechanics.
Ik-Joong Kim received B.S. and M.S. in Mechanical Engineering from Sungkyunkwan University, Seoul, Korea, in 2008 and 2010, respectively. He is currently working at Korea Gas Corporation Research Institute. His research interests include ductile damage modeling and numerical analyses of crack propagation.
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Jang, YY., Kim, IJ., Huh, NS. et al. Numerical investigation of the transferability of ductile fracture behavior between thin-walled surface-cracked pipe, curved wide plate (CWP) and single edge notched tension (SENT) specimens. J Mech Sci Technol 33, 4233–4243 (2019). https://doi.org/10.1007/s12206-019-0820-1
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DOI: https://doi.org/10.1007/s12206-019-0820-1