Dynamic Hardening Behavior and Ductile Fracture of High-Strength Steel at Intermediate Strain Rates
Publication: Journal of Structural Engineering
Volume 148, Issue 9
Abstract
The mechanical properties of constructional steels at different strain rates were the basis for the dynamic analysis of the progressive collapse of steel structures. The effect of strain rate on the hardening behavior and ductile fracture for the high-strength steel Q690 is investigated in this paper. Quasistatic and intermediate strain-rate experiments were performed. A smooth sheet and a V-shaped notched specimen were carefully designed to cover intermediate and high-stress triaxialities. The experimental results revealed that the effect of strain rate on the hardening behavior is sensitive to stress state. A novel dynamic isotropic hardening law was developed, taking advantage of the Cowper–Symonds and Johnson–Cook hardening models. Also, negative and positive strain-rate effects on the ductility of Q690 were observed in the smooth and notched specimens, respectively. An attempt was made to introduce a new strain-rate term into an uncoupled ductile fracture model to describe the differences of the strain-rate effects at various stress states. The new hardening law and the strain-rate-dependent ductile fracture model were validated with satisfactory accuracy.
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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 would like to gratefully acknowledge the funding support of this research provided by the National Natural Science Foundation of China (No. 51778086), the Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province (No. 02180024040012), and the Chongqing Talents Plan for Young Talents (No. CQYC201905055).
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Published In
Journal of Structural Engineering
Volume 148 • Issue 9 • September 2022
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© 2022 American Society of Civil Engineers.
History
Received: Dec 16, 2021
Accepted: Apr 4, 2022
Published online: Jun 27, 2022
Published in print: Sep 1, 2022
Discussion open until: Nov 27, 2022
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Cited by
- Mingxu Shang, Hua Yang, Andi Su, Yuyin Wang, Strain-rate and stress-state dependent ductile fracture model of S690 high-strength steel, Journal of Constructional Steel Research, 10.1016/j.jcsr.2023.107852, 204, (107852), (2023).