Deconvolution Procedure for Crack Depth Determination Using Rayleigh Waves
نویسندگان
چکیده
This paper describes a method for determining the depth of machined slots simulating cracks by the use of Rayleigh waves. Six slots varying in depth from 0.5 mm to 3.0 mm fabricated in medium carbon steel have been sized using a commercially available 1.5 MHz Rayleigh wave transducer. One measurement using the pulse-echo method is made for determining the depth of the crack. Minima in the deconvolved spectra are shown to correspond to various vibration modes of the crack. A fixed-free bar vibration model yields acceptable results. A correlation study between various time-domain features with slot depth is also included.
منابع مشابه
On the Resonances of Surface Breaking Cracks
The resonance phenomenon observed in Rayleigh wave scattering from surface-breaking cracks has been investigated using Freund's results on reflection of Rayleigh waves from an infinite crack edge. To model the crack as a section of acoustic waveguide, resonances are treated as standing waves in the length and depth directions. The model takes both faces of the crack into consideration, and this...
متن کاملInteraction of Rayleigh Waves Induced by Interdigital Transducer with Fatigue Crack
Compared to bulk waves, Rayleigh waves can propagate much longer distances with lower signal attenuation levels, which are nominally proportional to r / 1 for a given frequency (r=distance). In addition to the small attenuation, Rayleigh waves are also non-dispersive and sensitive to surface-breaking defects. The surface penetration depth of Rayleigh waves is also approximately one wavelength, ...
متن کاملFatigue Crack Detection in Metallic Members Using Spectral Anal Ysis of Ul Trasonic Rayleigh Waves
Ultrasonic testing for fatigue crack detection in metallic members are commonly performed using time domain analysis of Rayleigh waves. This approach will be successful only if the fatigue cracks produce strong interaction with the Rayleigh waves. The optimum frequency range of ultrasonic Rayleigh waves for scanning long structural members in the field is from 0.5 to 2.25 MHz because higher fre...
متن کاملAssessment of Reinforced Concrete Surface Breaking Crack Using Rayleigh Wave Measurement
An improved single sided Rayleigh wave (R-wave) measurement was suggested to characterize surface breaking crack in steel reinforced concrete structures. Numerical simulations were performed to clarify the behavior of R-waves interacting with surface breaking crack with different depths and degrees of inclinations. Through analysis of simulation results, correlations between R-wave parameters o...
متن کاملCrack Identification and Characterization in the Rayleigh Limit
We discuss apparent characteristic features of Rayleigh scattering of elastic waves from cracks. Interpreting these features, we propose a procedure that in some experimental situations may be useful to distinguish generally-shaped cracks from volume defects. For elliptically-shaped cracks, we propose additional procedures that in principle allow the unique specification of crack size, shape an...
متن کامل