In situ monitoring of damage in SiC/SiC composites using acousto-ultrasonics

Gyekenyesi, Andrew L.; Morscher, Gregory N.; Cosgriff, Laura M.

doi:10.1016/j.compositesb.2005.05.010

Cited by 32 publications

(24 citation statements)

References 9 publications

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“…It is important to mention that the investigated C/C-SiC composites showed some significant differences compared to recently studied SiC/SiC composites [5,7,9,11,12] using the same AE monitoring technique. Within CVI-10 and MI 11 -SiC/SiC composites high energy events occur early in the test which correspond to matrix 10 CVI: chemical vapor infiltration 11 MI: melt infiltration cracks.…”

Section: Resultsmentioning

confidence: 96%

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Modal acoustic emission of damage accumulation in C/C–SiC composites with different fiber architectures

Breede

Koch

Maillet

et al. 2015

Ceramics International

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Section: Resultsmentioning

confidence: 96%

“…In the recent past the modal acoustic emission approach has been used to investigate the stress-dependent damage accumulation in several ceramic matrix composite materials and has proven to correlate individual AE events to specific damage sources. [5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Modal acoustic emission of damage accumulation in C/C–SiC composites with different fiber architectures

Breede

Koch

Maillet

et al. 2015

Ceramics International

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“…Various empirical parameters associated with the received signal are used to study the before-and-after behavior of the material of interest. AU parameters shown to correlate with distributed damage in SiC/SiC composites include the diffuse field decay rate, the mean square value (MSV) of the power spectrum, and the centroid of the power spectrum 26,27 . An in-depth explanation of each of the terms is offered in Reference 26; this includes the associated equations and the detailed steps for obtaining the values.…”

Section: Test Procedures and Damage Assessmentmentioning

confidence: 99%

“…The fundamental aspect of the AU method entails introducing a mechanical excitation at one point on a material surface and sensing the resulting disturbance at another spot on the material surface 26 with the aim of interrogating the material in between. A pulsing transducer is used to introduce a broadband, ultrasonic pulse into the specimen.…”

Section: Test Procedures and Damage Assessmentmentioning

confidence: 99%

Detecting cracks in ceramic matrix composites by electrical resistance

Smith

Gyekenyesi

2011

SPIE Proceedings

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The majority of damage in SiC/SiC ceramic matrix composites subjected to monotonic tensile loads is in the form of distributed matrix cracks. These cracks initiate near stress concentrations, such as 90 o fiber tows or large matrix pores and continue to accumulate with additional stress until matrix crack saturation is achieved. Such damage is difficult to detect with conventional nondestructive evaluation techniques (immersion ultrasonics, x-ray, etc.). Monitoring a specimen"s electrical resistance change provides an indirect approach for monitoring matrix crack density. SylramiciBN fiber-reinforced SiC composites with a melt infiltrated (MI) matrix were tensile tested at room temperature.Results showed an increase in resistance of more than 500% prior to fracture, which can be detected either in situ or post-damage. A relationship between resistance change and matrix crack density was also determined.

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“…It can serve as the basis for analysis of problems involving a spatial distribution of viscoelastically coated fibers in an elastic matrix [62][63][64]. The calculated energy transfer between the fiber and matrix can be interpreted in the context of phenomena observed in acousto-ultrasonic (AU) experiments on fiber reinforced composite materials [65][66][67][68][69][70], which may be strongly influenced by state the interphase region. It can particularly be of practical value in quantitative characterization of the adhesive (dissipative) fiber-matrix bond by correlating certain parameters in the frequency spectrum of the detected waveform to mechanical characteristics of the interface layer [9,42,45,71,72].…”

Section: Introduction Smentioning

confidence: 99%

Ultrasonic Energy Transfer and Stress Concentrations in a Single-Fiber Composite with Absorbing Interface Layer

Hasheminejad

Miri

2008

Journal of Thermoplastic Composite Materials

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Elastic wave scattering from coated and layered cylindrical scatterers encased in an elastic matrix is reviewed. Interaction of time harmonic monochromatic longitudinal and shear ultrasonic waves with a single fiber coated by homogeneous dissipative (polymeric) materials and embedded in an unbounded elastic matrix is studied using the classical method of eigenfunction expansion. The novel features of Havriliak-Negami model is employed to include the effect of hysteresis-type of compressional and shear waves' absorption in the interphase material by introduction of proper frequency-dependent complex moduli. The pertinent integrals for the time-averaged total fiber energy induced by the elastic waves refracted along the fiber are derived and numerically evaluated. The numerical results reveal the important effects of the absorptive fiber-matrix bond as well as interphase thickness on fiber/matrix energy transfer and dynamic stress concentrations. The calculated results may be interpreted in the context of phenomena observed in acousto-ultrasonic (AU) experiments on fiber reinforced composite materials by correlating certain parameters in the frequency spectrum of the detected waveform to mechanical characteristics of the dissipative interface layer. Limiting cases are considered and good agreements with well-known solutions are established.

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In situ monitoring of damage in SiC/SiC composites using acousto-ultrasonics

Cited by 32 publications

References 9 publications

Modal acoustic emission of damage accumulation in C/C–SiC composites with different fiber architectures

Modal acoustic emission of damage accumulation in C/C–SiC composites with different fiber architectures

Detecting cracks in ceramic matrix composites by electrical resistance

Ultrasonic Energy Transfer and Stress Concentrations in a Single-Fiber Composite with Absorbing Interface Layer

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