Effects of stress ratio and banded microstructure on fatigue crack growth behavior of HRB400 steel bar

Yafei Ma; Zhongzhao Guo; Lei Wang; Jianren Zhang; Yongming Liu

doi:10.1061/(ASCE)MT.1943-5533.0002193

Effects of stress ratio and banded microstructure on fatigue crack growth behavior of HRB400 steel bar

Yafei Ma, Zhongzhao Guo, Lei Wang, Jianren Zhang, Yongming Liu

Research output: Contribution to journal › Article › peer-review

18 Scopus citations

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.

Original language	English (US)
Article number	04017314
Journal	Journal of Materials in Civil Engineering
Volume	30
Issue number	3
DOIs	https://doi.org/10.1061/(ASCE)MT.1943-5533.0002193
State	Published - Mar 1 2018

Keywords

Fatigue crack growth
Ferrite-pearlite
HRB400 steel bar
Microstructure
Stress ratio

ASJC Scopus subject areas

Civil and Structural Engineering
Building and Construction
General Materials Science
Mechanics of Materials

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10.1061/(ASCE)MT.1943-5533.0002193

Cite this

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title = "Effects of stress ratio and banded microstructure on fatigue crack growth behavior of HRB400 steel bar",

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.",

keywords = "Fatigue crack growth, Ferrite-pearlite, HRB400 steel bar, Microstructure, Stress ratio",

author = "Yafei Ma and Zhongzhao Guo and Lei Wang and Jianren Zhang and Yongming Liu",

note = "Funding Information: 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 Publisher Copyright: {\textcopyright} 2017 American Society of Civil Engineers.",

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doi = "10.1061/(ASCE)MT.1943-5533.0002193",

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AU - Ma, Yafei

AU - Guo, Zhongzhao

AU - Wang, Lei

AU - Zhang, Jianren

AU - Liu, Yongming

N1 - Funding Information: 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 Publisher Copyright: © 2017 American Society of Civil Engineers.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - 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.

AB - 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.

KW - Fatigue crack growth

KW - Ferrite-pearlite

KW - HRB400 steel bar

KW - Microstructure

KW - Stress ratio

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Effects of stress ratio and banded microstructure on fatigue crack growth behavior of HRB400 steel bar

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