PSI - Issue 28

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect

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ScienceDirect

Procedia Structural Integrity 28 (2020) 1024–1038

© 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Abstract A deformation and fracture model was developed for TC128B steel that is valid for temperatures between -80 and 24 °C and for various strain-rates. The Modified-Mohr-Coulomb (MMC) damage mechanics model was used in which the failure strain is dependant on both stress triaxiality and Lode angle. Several mechanical tests, finite element simulations and optimization methods are required to calibrate damage model parameters accurately. Calibration of damage models is often performed at only a single temperature, strain-rate and for a specific grade of steel. However, there are variations in the fracture response due to temperature, strain-rate, and nominal differences in the same grade of TC128B. The current work utilized a recent comprehensive damage model developed by Paredes et al. (2018) for a single grade of TC128 at room temperature as a starting point for model calibration. Damage model parameters were determined based on only a limited number of mechanical test data, mainly tensile and Charpy V-notch tests. It was found that the model could accurately capture the ductile fracture response of the material for a variety of temperatures and strain-rates. Distinct consideration was given to accurately capturing the brittle fracture response at low temperatures. © 2020 Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2020. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: ductile; brittle; crack; FEA; damage mechanics Abstract A deformation and fracture model was developed for TC128B steel that is v lid for temperatures between -80 and 24 °C and for various strain-rates. The Modifi d-Mohr-Coulomb (MMC) damage mechanics model was used in which the failure strain is dependant on both str ss t iaxiality and Lode ngle. S veral chani al tests, finite element si ulations and optimization thods are requir d to calibrate damage model par meters accurately. Calibration of damage models is often pe form d at only a single te perature, strai -rate f r a specific grad of ste l. However, there are variations in the fract re respons due t temperatur , strain-rate, and nominal ifferences in he same grade of TC128B. The current work utilized rec nt comprehens ve damage model developed by Pare s et l. (2018) for a single grade of TC128 at roo mperature as a starti g point for model calibrat on. Damage model parame ers were determined based on nly limited numbe of mechanical test data, mainly ensile and Charpy V-notch tests. It wa found that the model could accurately capture the ductile fra ture response of the mate a for vari ty of temperatures and str in-rates. Distinct consideration was given to accurately capturing the brittle fracture response at low temperatures. © 2020 Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2020. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) P er-review under responsibility of the European Structural Integrity Society (ESIS) ExCo Keywords: ductile; brittle; crack; FEA; damage mechanics 1st Virtual European Conference on Fracture Capturing Variability in the Fracture Response of TC128B Steel using Damage Mechanics B.W. Williams a *, J. McKinley a , S. Xu a , J. Xue a and M. Spiess b 1st Virtual European Conference on Fracture Capturing Variability in the Fracture Response of TC128B Steel using Damage Mechanics B.W. Williams a *, J. McKinley a , S. Xu a , J. Xue a and M. Spiess b a CanmetMATERIALS, Natural Resources Canada, Hamilton, Ontario, Canada b Transportation of Dangerous Goods, Transport Canada, Ottawa, Ontario, Canada a Canme MATERIALS, Natural Re ou ce Canad , H mil on, Ontario, Can d b Transportation of Dangerous Goods, Transport Canada, Ottawa, Ontario, Canada

* Bruce Williams. Tel.: 905-645-0730. E-mail address: bruce.williams@canada.ca * Bruce Williams. Tel.: 905-645-0730. E-mail address: bruce.williams@canada.ca

2452-3216 © 2020 Her Majesty the Queen in Right of Canada, as represented by the Minister of Natural Resources, 2020. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 Her Majesty the Queen n Right of Canada, as represented by t e Minist r of Natural Resources, 2020. Published by ELSEVIER B.V. Thi is an open access articl under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.118