Material Parameters in the GTN Model for Ductile Fracture Simulation of G20Mn5QT Cast Steels
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 1
Abstract
Material parameters in the Gurson, Tvergaard and Needleman (GTN) model were calibrated for G20Mn5QT cast steels based on tests of tension coupons and smooth notched tensile specimens, and complementary FEA. The mesh sensitivity of the calibrated GTN model was discussed regarding the efficiency of the FEA. As the mesh size decreases to 0.15 mm or finer, the prediction of the ductile fracture by the calibrated GTN model tends to converge. Four single-edge notched plate specimens of G20Mn5QT cast steels were tested under uniaxial tension, and the entire ductile fracture processes of the specimens were obtained. The ductile fracture of a double-hole plate specimen and the single-edge notched plate specimens were then simulated using the calibrated GTN model. The accuracy of the calibrated GTN model was verified by comparing the numerical simulation with the test results. Also validated was that the GTN model is applicable to not only the ductile fracture prediction but also the simulation of the stable fracture propagation.
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Data Availability Statement
Some or all of the data, models, or code that support the findings of this study are available from the corresponding author on reasonable request.
Acknowledgments
The authors of this paper express their appreciation for the financial support given by the National Natural Science Foundation of China (Grant No. 51525803).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 1 • January 2022
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Nov 3, 2020
Accepted: Jun 3, 2021
Published online: Oct 29, 2021
Published in print: Jan 1, 2022
Discussion open until: Mar 29, 2022
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