Experimental study on the surface stress measurement with Rayleigh wave detection technique

Hu, Eryi; He, Yuming; Chen, Yanming

doi:10.1016/j.apacoust.2008.03.002

Cited by 53 publications

(13 citation statements)

References 10 publications

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“…A Rayleigh wave with initial velocity V and stress fields , respectively, would attain a phase shift after propagating in a given distance on the medium surface. According to the discussions about Rayleigh wave acoustoelastic effect conducted by Hu et al [4], The variations of the propagation velocity can be expressed as a function of the two nonzero orthogonal subsurface stresses 1 and 2 as follows:…”

Section: The Acoustoelastic Effect Of Rayleigh Wavementioning

confidence: 99%

Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effect

Shao

2014

ISRN Mechanical Engineering

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In order to identify the travel-time difference accurately in the experimental study of Rayleigh wave acoustoelastic effect, an experimental system is constructed by the ultrasonic pulser-receiver, digital oscilloscope, Rayleigh wave transmitter and receiver, and a personal computer. And then, the digital correlation method and the Fourier transform frequency analysis method are used to obtain the travel-time difference of the Rayleigh wave corresponding to different subsurface stress conditions. Furthermore, the simulated ultrasonic signals are used to verify the reliability of the two kinds of ultrasonic signal information extracting algorithms, respectively. Finally, the proposed signal processing methods are applied to extract the time delay between different Rayleigh wave signals corresponding to different subsurface stress level.

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Section: The Acoustoelastic Effect Of Rayleigh Wavementioning

confidence: 99%

Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effect

Shao

2014

ISRN Mechanical Engineering

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“…This includes grain size [19], lattice defects [20,21], thermal effects [22] and surface stress measurement using Rayleigh waves [23]. This includes grain size [19], lattice defects [20,21], thermal effects [22] and surface stress measurement using Rayleigh waves [23].…”

Section: Measurement Of Inertial Stress and Strainmentioning

confidence: 99%

Defect Detection on Carbon Fibre Reinforced Plastics (Cfrp) With Laser Generated Lamb Waves

Focke¹,

Huke²,

Hildebrandt³

2011

AIP Conference Proceedings

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Standard ultrasound methods using a phased-array or a single transducer are commonly used for non-destructive evaluation (NDE) during manufacturing of carbon fiber reinforced plastics (CFRP) parts and certificated testing schemes were developed for individual parts and geometries. However, most testing methods need direct contact, matching gels and remain therefore time consuming. Laser-Ultrasonics is advantageous due to the contactless measurement technology and high accessibility even on complex parts. Despite the non-destructive testing with body waves, we show that the NDE can be expanded using two-dimensional surface (Lamb) waves for detection of delaminations close to the surface or small deteriorations caused by e.g. impacts. Lamb waves have been excited with a single transducer and with a short-pulse Laser with additionally producing A 0 -and S 0 -Lamb waves. The waves were detected with a shearography setup that allows for measuring two-dimensionally the displacement of a surface. Short integration times of the camera were realized using a pulsed ruby laser for illumination. As a consequence to the anisotropy the propagation in different directions exhibits individual characteristics like amplitude, damping and velocity. This has motivated to build up models for the propagation of Lamb waves and to compare them with experimental results.

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“…[1][2] (Cross-Correlation Function CCF) [3] CCF He Hilbert-Huang Transform HHT [4] HHT IMF CCF HHT II. [5] FRR (forward -reverse filtering, reverse output) [6] FRR…”

mentioning

confidence: 99%

Application of zero-phase digital filter in ultrasonic pressure measurement

Ling

Liu

Kong

et al. 2011

2011 International Conference on Electric Information and Control Engineering

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Conventional methods for pressure measurement commonly require drilling a hole in the wall of the vessels, which usually lead to potential safety problems. It is meaningful to study a nondestructive pressure measurement method using ultrasonic technique. One of key problems in ultrasonic pressure measurement is to estimate the time delay of two ultrasonic pulses accurately. A general cross correlation method based on zero-phase digital filter was presented to improve the accuracy of time delay estimation. Ultrasonic critically refracted longitudinal wave was applied to measure the pressure. Ultrasonic signals contain the correlative noise, therefore, pre-filtering of signal was needed. Zero-phase digital filter which could effectively eliminate the phase distortion that caused by common digital filter was proposed to process the signals. Compared to Hilbert-Huang Transform, the experimental result shows that the general cross correlation method based on zero-phase digital filter is more stable and simpler.

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Experimental study on the surface stress measurement with Rayleigh wave detection technique

Cited by 53 publications

References 10 publications

Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effect

Travel-Time Difference Extracting in Experimental Study of Rayleigh Wave Acoustoelastic Effect

Defect Detection on Carbon Fibre Reinforced Plastics (Cfrp) With Laser Generated Lamb Waves

Application of zero-phase digital filter in ultrasonic pressure measurement

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