Effects of Stress Ratio and Banded Microstructure on Fatigue Crack Growth Behavior of HRB400 Steel Bar
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 3
Abstract
This paper investigates the effects of stress ratio and microstructure on the fatigue crack growth (FCG) behavior of HRB400 steel bars widely used in concrete bridges. A constant stress–controlled FCG test with different stress ratios is performed on compact tension specimens. Test specimens are machined from rebar in two directions, i.e., cracks propagate in the radial and axial directions of the steel bar. The FCG rate versus stress intensity factor range under different stress ratios and different crack orientations are obtained. The morphology of the fracture surface and the FCG path are examined by scanning electron microscope and optical microscopy. Following this, the FCG curves, fracture characteristics, and FCG paths are compared. The experimental results show that the radial and axial crack predominantly present the transgranular and intergranular fracture mode, respectively. The material presents a higher resistance to FCG in radial orientation than that in axial direction.
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Acknowledgments
The study reported here is financially supported by the State Key Development Program for Basic Research of China (Grant No. 2015CB057705), the National Natural Science Foundation of China (Grant Nos. 51508036 and 51478050), the Natural Science Foundation of Hunan Province of China (Grant No. 2017JJ3325), the Scientific Research Fund of Hunan Provincial Education Department (Grant No. 17B012), and the Open Fund of Hunan Province Engineering Laboratory of Bridge Structure (Grant No. 16BCX14). The support is gratefully acknowledged. The authors also would like to acknowledge the valuable comments from the anonymous reviewers to improve the quality of the manuscript.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 3 • March 2018
Copyright
©2017 American Society of Civil Engineers.
History
Received: Apr 6, 2017
Accepted: Sep 7, 2017
Published online: Dec 29, 2017
Published in print: Mar 1, 2018
Discussion open until: May 29, 2018
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