Enhanced Voids Growth Model for Ductile Fracture Prediction of High-Strength Steel Q690D under Monotonic Tension: Experiments and Numerical Simulation
Publication: Journal of Structural Engineering
Volume 146, Issue 6
Abstract
Accurate prediction of progressive damage and failure of structural steels is a nontrivial issue in practical design and assessment of steel structural buildings. It appears far more important in the fracture-oriented scenarios under extreme environmental actions or accidental overloading conditions because, in these cases, the ultimate strength of steel structures is directly governed by material failure. However, previous studies on ductile fracture of structural steels were relatively limited, especially for high-strength steels (HSSs) like Q690D steel. In this paper, an enhanced fracture model based on the voids growth model (VGM) is proposed. The normalized maximum shear stress is introduced to make it capable of capturing ductile fracture at low and moderate stress triaxialities. To calibrate and verify the newly proposed model, a series of tensile tests of smooth and notched round bar specimens and shear specimens with different shear angles were carried out by using Q690D steel. Bridgeman’s theory was applied to identify the postnecking constitutive relationship with the help of a three-dimensional digital image correlation (3D-DIC) system. The good agreements between numerical simulations and experimental results finally verified the applicability and reliability of the enhanced model in ductile fracture prediction.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The authors gratefully acknowledge the financial support provided by the National Key R&D Program of China (2016YFC0701203), National Natural Science Foundation of China (No. 51778086), and the Fundamental and Frontier Research Project of Chongqing (cstc2015jcyjBX0024).
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Journal of Structural Engineering
Volume 146 • Issue 6 • June 2020
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©2020 American Society of Civil Engineers.
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Received: Mar 21, 2019
Accepted: Nov 26, 2019
Published online: Apr 3, 2020
Published in print: Jun 1, 2020
Discussion open until: Sep 3, 2020
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