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0Cr17Ni4Cu4Nb stainless steel early damage detection using nonlinear standing wave method |
YAN Bingsheng1, YANG Mingchao1, ZHAO Junjie1, TANG Baoping2, LIU Ziran1 |
1.School of Mechanical and Electrical Engineering, Henan University of Technology, Zhengzhou 45001, China
2.College of Mechanical Engineering, Chongqing University, Chongqing 400044, China |
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Abstract Here, Aiming at problems of lower signal amplitude and secondary harmonic waves being uneasy to be effectively excited and easy to be interfered in nonlinear ultrasonic longitudinal wave detection, a nonlinear standing wave detection method was proposed. The nonlinear ultrasonic longitudinal wave method and the nonlinear standing wave one were used to detect 0Cr17Ni4Cu4Nb martensitic stainless steel tensile specimens, respectively. The detection results showed that compared to the nonlinear ultrasonic longitudinal wave method, the nonlinear standing wave one can raise signal amplitude, effectively excite secondary harmonic waves generated due to non-linear interaction inside material, and improve signal-to-noise ratio of ultrasonic signals and frequency resolution of frequency spectra; the test results are basically consistent to the finite element simulation ones. Three-point bending fatigue specimens of 0Cr17Ni4Cu4Nb martensitic stainless steel were detected with the nonlinear standing wave method. It was shown that when the fatigue time is smaller than the fatigue life of 50%, normalized ultrasonic nonlinear coefficients increase with increase in fatigue life under different fatigue stresses; so the nonlinear standing wave method can better detect early damage of 0Cr17Ni4Cu4Nb stainless steel.
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Received: 07 August 2018
Published: 28 June 2019
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