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Resonant ultrasound spectroscopy of defects: Case study of flat-bottomed holes
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10.1063/1.4810926
/content/aip/journal/jap/113/22/10.1063/1.4810926
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/22/10.1063/1.4810926
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

3 mm-PMMA plate with a circular FBH (radius 1 cm, depth 2 mm) meshed (a) and vibration pattern at 1.5 kHz plate eigenfrequency (b).

Image of FIG. 2.
FIG. 2.

FEM simulation of LDR vibration patterns in PMMA plate shown in Fig. 1 : a fundamental LDR (10.4 kHz) (a) and higher-order LDR (23.25 kHz) (b).

Image of FIG. 3.
FIG. 3.

Amplitude spectrum and vibration patterns at resonance peaks for the FBH in PMMA plate shown in Figs. 1 and 2 .

Image of FIG. 4.
FIG. 4.

Fundamental frequency of LDR for a circular FBH (  = 0.7 mm;  = 1 cm) in a PMMA plate (200 × 30 × 3 mm) determined by different approaches.

Image of FIG. 5.
FIG. 5.

Normalized LDR fundamental frequency as a function of normalized FBH thickness in a PMMA plate: FE-simulation for a FBH with 10 mm.

Image of FIG. 6.
FIG. 6.

LDR fundamental frequencies as functions of FBH thickness calculated for different boundary conditions and measured for a 5 mm-radius FBH in 1 cm-thick PMMA specimen.

Image of FIG. 7.
FIG. 7.

LDR fundamental frequencies as functions of FBH radius calculated for different boundary conditions and measured for a set of defects with  = 0.5 mm in 3 mm epoxy specimen.

Image of FIG. 8.
FIG. 8.

(a) LDR vibration patterns for a circular FBH (radius 1 cm; thickness 1 mm) in a 3 mm-thick PMMA plate: fundamental LDR. (b) Zoom-in fundamental LDR frequency response for this FBH (resonance frequency 11 kHz, Q-factor is 100).

Image of FIG. 9.
FIG. 9.

Vibration patterns at the GFRP specimen eigenfrequency (3.4 kHz, (a)) and the fundamental LDR frequency (20.9 kHz, (b)) of the delamination.

Image of FIG. 10.
FIG. 10.

LDR vibration patterns for a 50 m-wide and 10 cm-long crack in GFR-concrete specimen (frequency 4.19 kHz, (a)) and for an impact induced loss of fibres (area 25 × 2 mm) in a CFRP plate (frequency 3.66 kHz, (b)).

Image of FIG. 11.
FIG. 11.

A PMMA specimen with many FBH of different thicknesses . The bottom row is marked to refer to Fig. 12 .

Image of FIG. 12.
FIG. 12.

Laser vibrometry images of FBH from a bottom row of Fig. 11 obtained in a sweep excitation mode at different LDR frequencies.

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/content/aip/journal/jap/113/22/10.1063/1.4810926
2013-06-14
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Resonant ultrasound spectroscopy of defects: Case study of flat-bottomed holes
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/22/10.1063/1.4810926
10.1063/1.4810926
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