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| Fatigue propagation behavior of mixed mode crack in wheel steel |
| JIANG Bo1，CHEN Gang1，ZHAO Hai1，XIAO Wei-rong2，LIU Peng2，REN Xue-chong2 |
（1. Technical Center， Ma’anshan Iron and Steel Co.， Ltd.， Ma’anshan 243000， Anhui，China
2. National Center for Materials Service Safety， University of Science and Technology Beijing， Beijing 100083， China） |
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Abstract In order to accurately assess the safety of wheel rim with defects，fatigue testes of type I crack，type II crack and type I＋II mixed mode crack under different loading conditions were done. The threshold value of fatigue propagation of mixed mode crack of wheel steel was obtained，and a suitable prediction criterion of mixed mode crack fatigue expansion for wheel steel was verified. The results show that the crack propagation direction for the I＋II mixed mode crack is basically consistent with the predicted value of the maximum tangential stress （MTS） criterion in test. The equivalent threshold value of fatigue crack propagation for I＋II mixed mode crack is ΔKth，equ＝3.0-3.8 MPa·m1/2（load ratio R＝0.5）. The microcracks were formed at the tip of prefatigued crack mainly by shear stress. The microcrack at the zone with tensile-shear stress is extended continuously，but microcrack at the zone with compression-shear stress can be formed but it stopped after a few tens of micrometers propagation.
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Received: 28 May 2018
Published: 24 December 2018
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2018, Vol. 53 
