Uncoupled Ductile Fracture Models for Grade 8.8S Steel Bolts Considering Different Stress States and Elevated Temperatures
Publication: Journal of Structural Engineering
Volume 150, Issue 12
Abstract
This paper presents the experimental results of Grade 8.8S high-strength steel coupons tensioned to fracture at room and elevated temperatures, followed by finite element analyses for investigating the ductile fracture behavior. Smooth round bars, notched round bars, flat shear sheets, and flat grooved sheets were tested at room temperature, which covered a wide range of stress states. The relationship between the ductility of the Grade 8.8S high-strength steel and the stress state was discussed. Extra smooth and notched round bars were also redesigned and tested at elevated temperatures. The nonlinear variations of material properties, including elastic modulus, yield strength, and tensile strength, were discussed. Different modeling strategies were used for the room and elevated temperatures. At room temperature, three uncoupled ductile fracture criteria were evaluated regarding their applications in the Grade 8.8S high-strength steel. Besides, in conjunction with a modified Johnson–Cook (JC) hardening model, the JC fracture criterion was improved and characterized by an exponential temperature function, as the original linear temperature function could not accurately describe the relationship between the fracture strain and temperatures. The developed finite element models closely traced most specimens’ load-displacement paths at the room and elevated temperatures.
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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 (Nos. 52478134 and 51778086) and Chongqing Key Project of Technological Innovation and Application Development Program (CSTB2022TIAD-KPX0204).
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 150 • Issue 12 • December 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 10, 2023
Accepted: Jun 25, 2024
Published online: Sep 28, 2024
Published in print: Dec 1, 2024
Discussion open until: Feb 28, 2025
ASCE Technical Topics:
- Analysis (by type)
- Continuum mechanics
- Cracking
- Ductility
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Finite element method
- Fracture mechanics
- High-strength steel
- Material mechanics
- Material properties
- Materials engineering
- Measurement (by type)
- Mechanical properties
- Metals (material)
- Methodology (by type)
- Numerical analysis
- Numerical methods
- Solid mechanics
- Steel
- Strength of materials
- Temperature (by type)
- Temperature effects
- Temperature measurement
- Thermal properties
- Thermodynamics
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