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Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates
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10.1121/1.3533741
/content/asa/journal/jasa/129/3/10.1121/1.3533741
http://aip.metastore.ingenta.com/content/asa/journal/jasa/129/3/10.1121/1.3533741

Figures

Image of FIG. 1.
FIG. 1.

(Color online) (a) Schematic diagram of the configuration used in FE simulations, (b) 3D FE model cross section at the delamination.

Image of FIG. 2.
FIG. 2.

Phase velocity dispersion curves for the [45/−45/0/90]S quasi-isotropic composite laminate at 0° propagation direction.

Image of FIG. 3.
FIG. 3.

(Color online) Typical contour snapshots of FE simulated out-of-plane displacement for the [45/−45/0/90]S composite laminate at different time instances, (a) soon after excitation and (b) shortly after A 0 Lamb wave interaction with a 11 mm diameter circular delamination located between the fourth and fifth lamina.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Phase velocity dispersion curves from theoretical calculation (solid lines), FE simulations (circles), and experimental measurements (triangle) for θ = 0° and (b) displacement modeshapes at 140 kHz (solid lines, theoretical calculation; circle, FE simulations).

Image of FIG. 5.
FIG. 5.

(Color online) Typical FE simulated and experimental measured time signals at r = 40 mm, θ = 220° of the composite laminate with a 11 mm diameter circular delamination located between the fourth and fifth lamina.

Image of FIG. 6.
FIG. 6.

(Color online) Normalized amplitude of the (a) reflected and (b) transmitted waves from a 11 mm diameter circular delamination located between the fourth and fifth lamina as a function of θ by 140 kHz incident wave.

Image of FIG. 7.
FIG. 7.

(Color online) SDP for (a) 3 mm, (b) 5 mm, and (c) 11 mm diameter delaminations located between the fourth and fifth lamina by 140 kHz incident wave.

Image of FIG. 8.
FIG. 8.

(Color online) Normalized amplitude for the (a) forward scattering, (b) backward scattering, and (c) backward to forward scattering ratio as a function of delamination diameter to wavelength ratio for delamination located between the fourth and fifth lamina.

Image of FIG. 9.
FIG. 9.

(Color online) SDP for a 5 mm diameter delamination located between the (a) third and fourth and (b) second and third lamina by 140 kHz incident wave.

Image of FIG. 10.
FIG. 10.

(Color online) SDP for cylindrical bonded mass of (a) 5 mm diameter with 3 mm thickness, (b) 10 mm diameter with 5 mm thickness from FE simulations (lines with empty circles) and experimental measurements (filled circles) by 140 kHz incident wave.

Image of FIG. 11.
FIG. 11.

(Color online) Normalized scattering amplitudes as a function of θ for a 5 mm diameter delamination at different through-thickness locations (solid line, second and third; dash line, third and fourth; dash–dot line, fourth and fifth) and bonded mass with different thicknesses (circle, 0.5 mm; square, 1 mm; triangle, 3 mm; rhombus, 5 mm; cross, 7 mm) at one side of the laminate from FE simulations.

Image of FIG. 12.
FIG. 12.

(Color online) Normalized amplitude as a function of damage diameter to wavelength ratio for θ = 0° and 180° (solid line, delamination between the second and third lamina; dash line, delamination between the third and fourth lamina; dash–dot line, delamination between the fourth and fifth lamina; circles, 0.5 mm thickness; squares, 1 mm thickness; triangles, 3 mm thickness bonded mass).

Tables

Generic image for table
TABLE I.

Elastic properties of Cycom® 970/T300 prepreg lamina.

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/content/asa/journal/jasa/129/3/10.1121/1.3533741
2011-03-09
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Scattering of the fundamental anti-symmetric Lamb wave at delaminations in composite laminates
http://aip.metastore.ingenta.com/content/asa/journal/jasa/129/3/10.1121/1.3533741
10.1121/1.3533741
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