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Experimental characterization of fatigue damage in a nickel-base superalloy using nonlinear ultrasonic waves
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10.1121/1.2221557
/content/asa/journal/jasa/120/3/10.1121/1.2221557
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/3/10.1121/1.2221557
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Experimental setup.

Image of FIG. 2.
FIG. 2.

(a) Typical time domain signals: Thin continuous and dotted lines are the transmitted signals with phase (uninverted) and out-of-phase (inverted) inputs, respectively. The thick line is the second-harmonic signal extracted by the pulse-inversion technique. (b) Fourier spectra of the original transmitted signal (fundamental) and the second-harmonic signal extracted by the pulse-inversion technique, demonstrating that the second-harmonic amplitude can be measured without being influenced by the large fundamental amplitude.

Image of FIG. 3.
FIG. 3.

(Color online) Second-harmonic amplitude versus the amplitude of the fundamental squared for increasing input voltage obtained from two independent measurements.

Image of FIG. 4.
FIG. 4.

(Color online) Monotonic load results—acoustic nonlinearity parameter versus applied stress (or strain) level.

Image of FIG. 5.
FIG. 5.

Low-cycle fatigue results—normalized acoustic nonlinearity parameter as a function of the percentage of fatigue life for three different fatigue specimens. The continuous line is the best-fit curve obtained from the discrete experimental data.

Image of FIG. 6.
FIG. 6.

Comparison of longitudinal and Rayleigh wave (Ref. 24) results showing the normalized acoustic nonlinearity parameter as a function of the percentage of fatigue life for the low-cycle fatigue results.

Image of FIG. 7.
FIG. 7.

High-cycle fatigue results—normalized acoustic nonlinearity parameter as a function of the percentage of fatigue life for five different fatigue specimens. The continuous line is the best-fit curve obtained from the discrete experimental data.

Image of FIG. 8.
FIG. 8.

Spatial variation of the normalized acoustic nonlinearity parameter on one failed high-cycle fatigue specimen, shown as a function of distance from the fracture site.

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/content/asa/journal/jasa/120/3/10.1121/1.2221557
2006-09-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Experimental characterization of fatigue damage in a nickel-base superalloy using nonlinear ultrasonic waves
http://aip.metastore.ingenta.com/content/asa/journal/jasa/120/3/10.1121/1.2221557
10.1121/1.2221557
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