Coupled analysis of high and low frequency resonant ultrasound spectroscopy: Application to the detection of defects in ceramic balls

Journal Article · Fri May 15 04:00:00 EDT 2009 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.3142462· OSTI ID:22053567

Deneuville, Francois; Duquennoy, Marc; Ouaftouh, Mohammadi; Jenot, Frederic; Ourak, Mohamed ^[1]; Desvaux, Sebastien ^[2]

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1. IEMN-DOAE (UMR CNRS 8520), Universite de Valenciennes, 59313 Valenciennes cedex 9 (France)
2. SKF Aeroengine France, Z. I. no. 2, Rouvignies, 59309 Valenciennes (France)

A coupled analysis of high and low frequency resonant ultrasound spectroscopy of spheroidal modes is presented in this paper. Experimentally, by using an ultrasonic probe for the excitation (piezoelectric transducer) and a heterodyne optic probe for the receiver (interferometer), it was possible to take spectroscopic measurements of spheroidal vibrations over a large frequency range of 100 kHz-45 MHz in a continuous regime. This wide analysis range enabled variations in velocity due to the presence of defects to be differentiated from the inherent characteristics of the balls and consequently, it offers the possibility of detecting cracks independently of production variations. This kind of defect is difficult to detect because the C-shaped surface crack is very small and narrow (500x5 {mu}m{sup 2}), and its depth does not exceed 50 {mu}m. The proposed methodology can excite spheroidal vibrations in the ceramic balls and detect such vibrations over a large frequency range. On the one hand, low frequency resonances are used in order to estimate the elastic coefficients of the balls according to various inspection depths. This method has the advantage of providing highly accurate evaluations of the elastic coefficients over a wide frequency range. On the other hand, high frequency vibrations are considered because they are similar to the surface waves propagating in the surface zone of the ceramic balls and consequently can be used to detect C-crack defects.

• OSTI ID: 22053567
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 5 Vol. 80; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
CERAMICS
CRACKS
DEFECTS
EXCITATION
INTERFEROMETERS
KHZ RANGE
MHZ RANGE
RESONANCE
SPECTROSCOPY
SURFACES
TRANSDUCERS
ULTRASONIC TESTING
WAVE PROPAGATION