Early fatigue damage detection in metal pressure pipelines based on a nonlinear ultrasonic wave mixing method
Pressure pipelines produce fatigue damage under the effects of load fluctuations and other factors.The accu-mulation of fatigue damage may cause the failure of pipelines.This paper solves the problem of detecting early fa-tigue damage in metal pressure pipelines.A nonlinear ultrasonic wave mixing method is proposed to detect fatigue damage.A detection device is designed to implement the nonlinear ultrasonic wave mixing method.Fatigue damage detection experiments are conducted on 304 stainless steel specimens.The relationship between the fatigue damage level and the nonlinear wave mixing index is established.Moreover,experiments are conducted to detect fatigue damage of 304 stainless steel pipes.Experimental results indicate that the nonlinear wave mixing index increases more quickly in the stress concentration area.The nonlinear ultrasonic wave mixing method is proved to be effective for detecting and assessing the early fatigue damage in metal pressure pipelines.
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