期刊
MATERIALS
卷 12, 期 17, 页码 -出版社
MDPI
DOI: 10.3390/ma12172698
关键词
railway; stress fatigue; ultrasonic nonlinear wave; wave mixing
类别
资金
- National Research Foundation of Korea (NRF) - Korea government (MSIT) [NRF-2019R1G1A1004577]
Nonlinear ultrasonic testing has been accepted as a promising manner for evaluating material integrity in an early stage. Stress fatigue is the main threats to train safety, railways examinations for stress fatigue are more significant and necessary. A series of ultrasonic nonlinear wave experiments are conducted for rail specimens extracted from railhead with different degree of fatigue produced by three-point bent loading condition. The nonlinear parameter is the indicator of nonlinear waves for expressing the degree the fatigue. The experimental results show that the sensitivity of a third harmonic longitudinal wave is higher than second harmonic longitudinal wave testing. As the same time, collinear wave mixing shows strong relative with fatigue damages than a second longitudinal wave nondestructive testing (NDT) method and provides more reliable results than third harmonic longitudinal waves nonlinear testing method.
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