Stress ratio effect on the multi-scale fatigue crack propagation behavior of the nickel-based GH4169 alloy
The multi-scale fatigue crack growth behavior of the newly developed GH4169 Ni-based alloy at a maximum stress of 700 MPa and different stress ratios were investigated in the present work employing the specimens with a single micro-notch at a frequency of 129 Hz at room temperature.The results demonstrate a typical three-stage process of fatigue crack propagation processing from the microstructurally small crack (MSC) stage to the physically small crack (PSC) stage, and fimally to the long crack (LC) stage.The crack growth rate in the MSC stage is relatively high, while the crack growth rate in the physically small crack (PSC) stage is relatively low.An empirical formula was proposed to predict the relationship between the growth rate of small cracks and crack tip plastic zone size, indicating an adequate prediction solution.
Multi-scale fatigue crack Crack growth rate Stress ratio Ni-base alloy
Shen Ye Jian-Guo Gong Xian-Cheng Zhang Cheng-Cheng Zhang Shan-Tung Tu Cheng-Cheng Zhang
Key Laboratory of Pressure Systems and Safety (MOE), School of Mechanical and Power Engineering,East AVIC Commercial Aircraft Engine Co.L TD, Shanghai Engineering Research Center for Commercial Aircraf
国际会议
长沙
英文
67-77
2016-10-16（万方平台首次上网日期，不代表论文的发表时间）