Loading Waveform Effect on Fatigue Crack Growth Behavior of LZ50 Axle Steel

被引：0
|
作者：
Yang B. [1 ]
Liao Z. [1 ]
Xiao S. [1 ]
Yang G. [1 ]
Zhu T. [1 ]
机构：
[1] State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu
来源：
| 1600年 / Science Press卷 / 42期
关键词：
Fatigue crack growth; Fracture morphology; Loading waveform; LZ50 axle steel;
D O I：
10.3969/j.issn.1001-8360.2020.05.006
中图分类号：
学科分类号：
摘要：
Fatigue crack growth tests using LZ50 steel compact tensile specimens were performed under three different loading waveforms, i.e. triangular wave, sinusoidal wave and square wave. The characteristics of fatigue fracture were observed by scanning electron microscopy, and the effects of different loading waveforms on crack size increment and crack growth rate were analyzed based on the experimental data. The results show that the sensitivity of fatigue crack growth behavior to the waveform is relatively low and the fracture morphology of specimens is basically the same at high loading frequency. The influence of waveform on the fatigue crack growth behavior increases and the fracture morphology of specimens is different at low loading frequency. Meanwhile, the main mechanism in critical crack propagation region is fatigue striations, and the spacing of fatigue striations under triangular wave is significantly smaller than that under the other two waves. The main morphology in unstable propagation region is dimple, the shape of which is smaller and shallower under triangular wave than that under the other two waves. Stress intensity factor under the three different loading modes was calculated and analyzed based on simulation using LS-DYNA software and the node displacement extrapolation method. The results demonstrate that the influence mechanism of the loading waveforms on fatigue crack growth behavior obtained by simulation analysis is essentially consistent with the experimental results. © 2020, Department of Journal of the China Railway Society. All right reserved.
引用
下载
收藏
页码：44 / 50
页数：6
相关论文
共 23 条
  • [1] Barsom J.M., Corrosion-fatigue Crack Growth Behavior Below K<sub>ISCC</sub>, Engineering Fracture Mechanics, 3, 1, pp. 5-25, (1971)
  • [2] Achilles R.D., Bulloch J.H., The Influence of Waveform on the Fatigue Crack Growth Behaviour of SA508 cl III RPV Steel in Various Environments, International Journal of Pressure Vessels & Piping, 30, 5, pp. 375-389, (1987)
  • [3] Smith P., Stewart A.T., Effect of Aqueous and Hydrogen Environments on Fatigue Crack Growth in 2Ni-Cr-Mo-V Rotor Steel, Metal Science, 13, 7, pp. 429-435, (1979)
  • [4] Wang Z.F., Li J., Wang J.Q., Et al., The Influence of Loading Waveform on Corrosion Fatigue Crack Propagation, Corrosion Science, 37, 10, pp. 1551-1565, (1995)
  • [5] Bache M.R., Evans W.J., Hardy M.C., The Effects of Environment and Loading Waveform on Fatigue Crack Growth in Inconel 718, International Journal of Fatigue, 21, pp. 69-77, (1999)
  • [6] Liang Y., Huang Y., Wu Z., Influence of Loading Waveforms on Corrosion Fatigue Crack Growth for D36 Steel, Corrosion & Protection, 37, 4, pp. 289-293, (2016)
  • [7] Atkinson J.D., Lindley T.C., Effect of Stress Waveform and Hold-time on Environmentally Assisted Fatigue Crack Propagation in C-Mn Structural Steel, Metal Science Journal, 13, 7, pp. 444-448, (1979)
  • [8] Saxena A., Liaw P.K., Landes J.D., The Influence of Waveform and Long Hold Time on the Corrosion Fatigue Crack Growth Behavior of an Austenitic Steel, Material Science and Engineering, 95, pp. 137-143, (1987)
  • [9] Ling L., Xiao X., Wu L., Et al., Effect of Spectrum Characteristics of Seismic Wave on Derailment of High-speed Train, Engineering Mechanics, 30, 1, pp. 384-393, (2013)
  • [10] Liu X., Cheng Y., Yuan Z., Et al., The Influence of Load Wave on the Rate of Fatigue Crack Growth in Axle Steel, Journal of Northern Jiaotong University, 19, 2, pp. 165-168, (1995)
123