(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)
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.
HE Xiao-lin, ZHANG Peng-pai, CHEN Xin et al.Analysis of features of development of cracking in wheel rims for freight cars[J].[J]. Rolling Stock, 2017, 55(12):12-15
[3]
HE Xiao-lin, ZHANG Peng-pai, CHEN Xin et al.Analysis of features of development of cracking in wheel rims for freight cars[J].[J]. Rolling Stock, 2017, 55(12):12-15
[4]
Liu Y, Stratman B, Mahadevan S.Fatigue crack initiation life prediction of railroad wheels[J].International Journal of Fatigue, 2006, 28(7):747-756
[4]
Liu Y, Stratman B, Mahadevan S.Fatigue crack initiation life prediction of railroad wheels[J].International Journal of Fatigue, 2006, 28(7):747-756
[5]
马世骧,胡泓.试件中复合型疲劳裂纹扩展[J].力学学报, 2006, 38(5):698-704
[5]
马世骧,胡泓.试件中复合型疲劳裂纹扩展[J].力学学报, 2006, 38(5):698-704
[6]
MA Shi-xiang, HU Hong.The mixed mode propagation of fatigue crack in CTS specimen[J].Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(5):698-704
[6]
MA Shi-xiang, HU Hong.The mixed mode propagation of fatigue crack in CTS specimen[J].Chinese Journal of Theoretical and Applied Mechanics, 2006, 38(5):698-704
Doquet V, Bertolino G.A material and environment-dependent criterion for the prediction of fatigue crack paths in metallic structures[J].Engineering Fracture Mechanics, 2008, 75(11):3399-3412
[8]
Doquet V, Bertolino G.A material and environment-dependent criterion for the prediction of fatigue crack paths in metallic structures[J].Engineering Fracture Mechanics, 2008, 75(11):3399-3412
[9]
Matsunaga H, Makizaki M, Socie D F, et al.Acceleration of fatigue crack growth due to occasional mode II loading in 7075 aluminum alloy[J].[J].Engineering Fracture Mechanics, 2014, 123:126-136
[9]
Matsunaga H, Makizaki M, Socie D F, et al.Acceleration of fatigue crack growth due to occasional mode II loading in 7075 aluminum alloy[J].[J].Engineering Fracture Mechanics, 2014, 123:126-136
[10]
Erdogan F, Sih G C.On the Crack Extension in Plates Under Plane Loading and Transverse Shear[J].Journal of Basic Engineering, 1963, 85(4):527-536
[10]
Erdogan F, Sih G C.On the Crack Extension in Plates Under Plane Loading and Transverse Shear[J].Journal of Basic Engineering, 1963, 85(4):527-536
[11]
Sih G C.Strain-energy-density factor applied to mixed mode crack problems[J].International Journal of Fracture, 1974, 10(3):305-321
[11]
Sih G C.Strain-energy-density factor applied to mixed mode crack problems[J].International Journal of Fracture, 1974, 10(3):305-321
[12]
Hayashi K, Nemat-Nasser S.Energy-release rate and crack kinking under combined loading[J].Journal of Applied Mechanics, 1981, 48(3):520-524
[12]
Hayashi K, Nemat-Nasser S.Energy-release rate and crack kinking under combined loading[J].Journal of Applied Mechanics, 1981, 48(3):520-524
[13]
Sander M, Richard H A.Experimental and numerical investigations on the influence of the loading direction on the fatigue crack growth[J].International Journal of Fatigue, 2006, 28(5):583-591
[13]
Sander M, Richard H A.Experimental and numerical investigations on the influence of the loading direction on the fatigue crack growth[J].International Journal of Fatigue, 2006, 28(5):583-591
[14]
Richard H A.Safety estimation for construction units with cracks under complex loading[J].International Journal of Materials & Product Technology, 1988, volume 3(3):326-338
[14]
Richard H A.Safety estimation for construction units with cracks under complex loading[J].International Journal of Materials & Product Technology, 1988, volume 3(3):326-338