Laser ultrasonics detection of an embedded crack in a composite spherical particle

Amziane, Ahmed; Amari, Mohamed; Mounier, Denis; Breteau, Jean‐Marc; Joly, Nicolas; Banchet, J.; Tisseur, David; Гусев, В. П.

doi:10.1016/j.ultras.2011.06.008

Cited by 22 publications

(6 citation statements)

References 10 publications

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“…The appearance of many eigenfrequencies in the "forbidden gaps" is the major indicator of the presence of the defect. The spectrum of the cracked particle displays also an increase in multiplet widths, which is confirmed by a finite element modeling 5 . In addition, eigenfrequencies of a cracked particle are down-shifted by the presence of a crack.…”

Section: Crack Detection In the Sic Layersupporting

confidence: 63%

“…Spherical symmetry greatly simplifies the modal analysis of HTR particles. From the group theory standpoint, the spectroscopic labeling of the normal modes for a multilayered spherical object and for a homogeneous sphere is identical 5 . The normal vibration modes of a spherical structure belong either to spheroidal modes (S) or to torsional modes (T).…”

Section: Eigenmodes Of a Dummy Htr Particlementioning

confidence: 99%

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Laser ultrasonics evaluation and testing of coated HTR nuclear fuel

et al. 2011

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Laser ultrasonics was applied to the manufacturing control of the quality and integrity (no failure) of coated spherical particles designed for High Temperature Reactors (HTR). The coating of the nuclear fuel kernel is designed to prevent from the diffusion of fission products outside the particle during reactor operation. The quality assessment of the coating layers is of major importance. Using laser ultrasonics, we determined the vibration eigenmodes of dummy HTR particles. The vibration spectrum of a HTR particle provides a non-destructive method of evaluating some important mechanical parameters of the coating. Moreover, without damaging the particle, the laser ultrasonics technique allows to test the presence of a crack in the SiC layer, through the observation of the particle vibration spectrum, which is significantly changed, compared to that of a defect-free particle. We applied nanosecond acoustic pulses, i.e., high frequency laser-generated ultrasound, to measure the acoustic velocity of longitudinal waves the SiC layer. This technique provides an alternative method of evaluation of the Young modulus of the SiC layer. We measure the velocity of surface acoustic waves (SAW) on a pyrocarbon layer cross-section and we demonstrated that the anisotropy of the internal pyrocarbon layer can be evaluated by laser ultrasonics.

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Section: Crack Detection In the Sic Layersupporting

confidence: 63%

Section: Eigenmodes Of a Dummy Htr Particlementioning

confidence: 99%

Laser ultrasonics evaluation and testing of coated HTR nuclear fuel

et al. 2011

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“…Some methods 30 – 34 rely on contacting vibration excitation or contacting signal detection. All optical RUS 35 – 37 and laser ultrasonic methods 38 – 41 are contactless techniques for the evaluation of mechanics and fatigue. However, these methods require direct detection of the surface vibration of samples by optical methods.…”

Section: Discussionmentioning

confidence: 99%

Noninvasive low-cycle fatigue characterization at high depth with photoacoustic eigen-spectrum analysis

Gao

Tao

Zhu

et al. 2018

Sci Rep

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In this work, photoacoustic eigen-spectrum analysis was proposed for noninvasively characterizing the mechanical properties of materials. We theoretically predicted the relationship between the photoacoustic eigen-spectra of cylindrical optical absorbers and their mechanical properties. Experimental measurements of eigen-spectra extracted from photoacoustic coda waves agreed well with the theoretical predictions. We then applied the photoacoustic eigen-spectrum analysis for contactless monitoring of low-cycle fatigue damage. Experiments showed that the photoacoustic eigen-spectra were closely related to the degree of low-cycle fatigue. This study might enhance the contrast of photoacoustic imaging ford mechanical characterization.

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“…Longitudinal wave (P-wave), one important branch in bulk waves, is the first significant peak and has often been used for characterizing the thickness, density, and elasticity of the material. − In our case, as shown in Figure a, a high-energy pulsed Tolar-1053 laser (1053 nm wavelength and 20 mJ/pulse) is to excite ultrasonic waves via thermoelastic expansion and a He–Ne laser is used as an indicator light. Here, we partially focus the laser source beam of ∼6 mm in radius on the crude oil sample.…”

Section: Methodsmentioning

confidence: 99%

Non-contact Measurement of the Water Content in Crude Oil with All-Optical Detection

Lu¹,

Yang²,

Zhao³

et al. 2015

Energy Fuels

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Water content in crude oil is very important in an oilfield production logging system. A non-contact optical method, called all-optical detection, was proposed for measuring the water content in the full range of 0−100% in crude oil by a non-contact laser source and receiver (adaptive laser interferometer). The laser-induced ultrasonic P-wave velocities of three series of an oil−water mixture accelerated significantly from 1289, 1342, and 1343 m/s, respectively, to 1458 m/s with the increase of the water content from 0 to 100%. The theoretical values of the effective medium model were agreement with the experimental results of three series of an oil−water mixture.

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Laser ultrasonics detection of an embedded crack in a composite spherical particle

Cited by 22 publications

References 10 publications

Laser ultrasonics evaluation and testing of coated HTR nuclear fuel

Laser ultrasonics evaluation and testing of coated HTR nuclear fuel

Noninvasive low-cycle fatigue characterization at high depth with photoacoustic eigen-spectrum analysis

Non-contact Measurement of the Water Content in Crude Oil with All-Optical Detection

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