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 journalArticlepeer-review

18 Scopus citations


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 languageEnglish (US)
Article number04017314
JournalJournal of Materials in Civil Engineering
Issue number3
StatePublished - Mar 1 2018


  • 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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