PSI - Issue 28

J. Xue et al. / Procedia Structural Integrity 28 (2020) 1047–1054 J. Xue, B. Williams, S. Xu and W.R. Tyson/ Structural Integrity Procedia 00 (2019) 000–000

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 For the DWTT bending model, the CTOA on the surface is higher than that in the interior, which is in agreement with the experiments. For the DWTT tension model, there is no significant difference between CTOA on the surface and CTOA in the interior.  CTOA is consistent in DWTT specimens under bending and tension and both cases exhibit steady-state propagation.  The results from this research support the use of a constant CTOA measured using DWTT specimen and E3039 to other geometries under a range of loading conditions. Acknowledgements This work was funded by a CanmetMATERIALS (CMAT) project on Fast Ductile Fracture Arrest Methodology and Standard supported by the Federal Program on Energy Research and Development (PERD). The authors would like to acknowledge many useful discussions with Xin Wang and Chris Bassindale of Carleton University, and Mark Gesing from CanmetMATERIALS. References ASTM E3039 - 18, 2018. Standard Test Method for Determination of Crack-Tip-Opening Angle of Pipe Steels Using DWTT-Type Specimens. Bai, Y.,Wierzbicki, T., 2010. Application of extended Mohr-Coulomb criterion to ductile fracture. International Journal of Fracture., 161, 1–20. Horsley, D. J., 2003. Background to the use of CTOA for prediction of dynamic ductile fracture arrest in pipelines. Engineering Fracture Mechanics., 70, 547–552. Maxey, W. A., 1974. Fracture Initiation, Propagation and Arrest. Proceedings of 5th Symposium on Line Pipe Research, Houston/USA, paper J-1. Newman, J. C., 1995. Fracture Analysis of Stiffened Panels Under Biaxial Loading with Widespread Cracking . Newman, J. C.,James, M. A.,Zerbst, U., 2003. A review of the CTOA/CTOD fracture criterion. Engineering Fracture Mechanics., 70, 371–385. Paredes, M.,Wierzbicki, T.,Zelenak, P., 2016. Prediction of crack initiation and propagation in X70 pipeline steels. Engineering Fracture Mechanics., 168, 92–111. Paredes, M.,Lian, J.,Wierzbicki, T.,Cristea, M. E.,Münstermann, S.,Darcis, P., 2018a. Modeling of plasticity and fracture behavior of X65 steels: seam weld and seamless pipes. International Journal of Fracture., 213, 17–36. Paredes, M.,Sarzosa, D. F. B.,Savioli, R.,Wierzbicki, T.,Jeong, D. Y.,Tyrell, D. C., 2018b. Ductile tearing analysis of TC128 tank car steel under mode I loading condition. Theoretical and Applied Fracture Mechanics., 96, 658–675. Parmar, S.,Bassindale, C.,Wang, X.,Tyson, W. R.,Xu, S., 2018. Simulation of ductile fracture in pipeline steels under varying constraint conditions using cohesive zone modeling. International Journal of Pressure Vessels and Piping., 162, 86–97. Simha, C. H. M.,Xu, S.,Tyson, W. R., 2014. Non-local phenomenological damage-mechanics-based modeling of the Drop-Weight Tear Test. Engineering Fracture Mechanics., 118, 66–82. Wilkowski, G.,Kalyanam, S.,Brust, B., 2019. 1st Round-Robin for Exploring the Effects of Constraint on Fracture Initiation Toughness for Surface Cracked Pipe/Fittings – in Conjunction with ASME PVP2019. Workshop at ASME PVP2019. Engineering Mechanics Corporation of Columbus. Xu, S.,Tyson, W. R.,Eagleson, R.,McCowan, C. N.,Drexler, E. S.,McColskey, J. D.,Darcis, P. P., 2010. Measurement of CTOA of pipe steels using MDCB and DWITT specimens. Proceedings of the Biennial International Pipeline Conference, IPC., 2, 269–278. Xu, S.,Tyson, W. R.,Rothwell, B., 2015. Recent developments in design for crack arrest using the crack- tip opening angle (CTOA). The Journal of Pipeline Engineering., 14, 241–247. Xu, S.,Bassindale, C.,Williams, B. W.,Wang, X.,Tyson, W. R.,Shibanuma, K., 2019. Comments on CTOA transferability in “Crack tip opening angle during unstable ductile crack propagation of a high-pressure gas pipeline” [204 (2018) 434–453]. Engineering Fracture Mechanics., 214, 335–338. Xue, J.,Williams, B. W.,Park, D. Y.,Xu, S.,Tyson, W. R., 2019. Round-Robin Analyses of Constraint Effects on Fracture Initiation Toughness for Specimens and Surface-Cracked Pipe. Workshop at ASME PVP 2019. San Antonio, Texas.