Applications of digital methods to ultrasonic materials characterization

Kline, Ronald A.; Egle, D. M.

doi:10.1016/0308-9126(86)90004-0

Cited by 8 publications

(4 citation statements)

References 6 publications

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“…The appearance of high-speed digital wave memories with large data storage allows us to evaluate both the velocity and the attenuation simultaneously using the echo wave trains stored in the wave memory. The digital measurement system and the digital signal processing to ultrasonic pulse-echoes have been reported [2][3][4]. These results show the validity of the digital technique, however, these digital methods are not widely used.…”

Section: Introductionmentioning

confidence: 69%

Digital Measurement of Ultrasonic Velocity

Fujii

Kawashima

1995

Review of Progress in Quantitative Nondestructive Evaluation

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Section: Introductionmentioning

confidence: 69%

Digital Measurement of Ultrasonic Velocity

Fujii

Kawashima

1995

Review of Progress in Quantitative Nondestructive Evaluation

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“…With the phase spectral method [7][8][9], the time delay was determined and is shown in Fig.6. The corresponding amplitude spectrum is given in Fig.5.…”

Section: Phase Velocitymentioning

confidence: 99%

A Digital Signal Processing for Measuring Leaky Surface Wave Velocity with C-Scan Acoustic Microscope

Kawashima

Fujii

Sato

et al. 1996

Review of Progress in Quantitative Nondestructive Evaluation

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“…After the Fourier transform was carried out for the recorded waveforms, the wave velocity V(f) and attenuation coefficient α(f) in the thickness direction were obtained as functions of the frequency f using the following equations [42]:…”

Section: Methodsmentioning

confidence: 99%

Influence of porosity on ultrasonic wave velocity, attenuation and interlaminar interface echoes in composite laminates: Finite element simulations and measurements

Ishii

Biwa

Kuraishi

2016

Composite Structures

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The influence of porosity on the ultrasonic wave propagation in unidirectional carbon-fiber-reinforced composite laminates is investigated based on the two-dimensional finite element analysis and measurements. Random distributions of pores with different contents and size are considered in the analysis, together with the effects of viscoelastic plies and interlaminar resin-rich regions. The transient reflection waveforms are calculated from the frequency-domain finite-element solutions by the inverse Fourier transform. As the measures for porosity characterization, the ultrasonic wave velocity, attenuation coefficient, and interlaminar interface echo characteristics are examined for 24-ply unidirectional composite laminates. As a result, the wave velocity decreases with the porosity content in a manner insensitive to the pore size. On the other hand, the attenuation coefficient increases both with the porosity content and with the pore size. The time-frequency analysis of the reflection waveforms shows that the temporal decay rate of interlaminar interface echoes at the stop-band frequency is a good indicator of the porosity content. The measured porosity-content dependence of the wave velocity is better reproduced by the numerical simulations when the interlayer interfacial stiffnesses are adjusted according to the porosity content, indicating that not only the porosity features but also the interlaminar interfacial properties vary with curing conditions.

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Applications of digital methods to ultrasonic materials characterization

Cited by 8 publications

References 6 publications

Digital Measurement of Ultrasonic Velocity

Digital Measurement of Ultrasonic Velocity

A Digital Signal Processing for Measuring Leaky Surface Wave Velocity with C-Scan Acoustic Microscope

Influence of porosity on ultrasonic wave velocity, attenuation and interlaminar interface echoes in composite laminates: Finite element simulations and measurements

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