Abstract
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.
Highlights
Rails are an important element in railway systems
Railways are mass transit systems that will cause many casualties and massive economic losses. These accidents can arise from various deficiencies in the railway system, and in particular rail defects are a significant threat to the safe operation of rail transport
Experimental studies performed based on a general nonlinear ultrasound method, method, such as second and third harmonic longitudinal wave tests and collinear wave mixing on mixing are expressed
Summary
Rails are an important element in railway systems. Maintenance of railway systems today is more important and necessary as traffic volume increases. Experimental studies performed based on a general nonlinear ultrasound method, method, such as second and third harmonic longitudinal wave tests and collinear wave mixing on mixing are expressed. Experimental studies performed based on a general nonlinear ultrasound such as second and third harmonic longitudinal wave tests and collinear wave mixing on the fatigue the fatigue rail treated a 3-point cyclic bending load.and. Thecollinear main idea of this research method, such as specimen second and third with harmonic longitudinal wave tests wave mixing on rail specimen treated with a 3-point cyclic bending load. The main idea of this measurement research paperand is paper is comparison between third harmonic nonlinear parameter the fatigue rail specimen treatedsecond with a and.
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