Evaluation of minute cracks generated by spallation with nonlinear ultrasonic measurement

Kawashima, Koichiro; Okada, Jyun-ichi; Nawa, Koji; Nishimura, Naoya

doi:10.1063/1.1373902

Cited by 2 publications

(1 citation statement)

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“…The linear attenuation of the wave between two transducers placed on both sides of a crack can be used to detect the crack and determine its size [5]. Apart from the linear attenuation characteristics of ultrasonic surface waves, it has been shown that cracks also result in a nonlinear wave propagation [6], [7]. When using this nonlinear wave behavior in the NDT procedure, cracks smaller than the Rayleigh wavelength can be detected (in contrast to linear SAW based NDT techniques).…”

Section: Introductionmentioning

confidence: 99%

8D-5 Tracking of Cracks in Fatigue Experiments Using Nonlinear Propagation of Multi-Sine Surface Acoustic Waves

Vanlanduit

Longo

Guillaume

et al. 2007

2007 IEEE Ultrasonics Symposium Proceedings

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Ultrasonic surface waves (SAWs) provide a sensitive means to nondestructively detect surface cracks in structures. When continuously receiving transmitted SAWs while the structure is fatigue tested, the received ultrasonic waves are modulated (due to the changing strain between the sensors or due to the opening and closing behavior of a crack that is possibly present between the sensors). The measurement of the nonlinear modulation character during the fatigue tests leads to an unambiguous interpretation of the health of the structure. In this article a procedure is proposed to measure the amplitude and frequency modulation of SAW waves during fatigue testing. Results on a bending beam test with a propagating fatigue crack show that the measured nonlinear amplitude modulation can be used to detect cracks smaller than the SAW wavelength.

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Section: Introductionmentioning

confidence: 99%