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Nondestructive testing of defects in adhesive joints

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( 110)<br />

(a) PP/MWNT (0.5 wt%) fiber<br />

(b)<br />

Intensit y (a.<br />

u)<br />

(040)<br />

Figure 2: (a) Wide angle X-ray Diffraction (WAXD) spectra <strong>of</strong> PP/MWNT composites<br />

(b) Azimuthal scan <strong>of</strong> (110) PP plane<br />

Intensity (a.u)<br />

(130)<br />

12 14 16 18 20 22<br />

2θ (degrees)<br />

1500 1550 1600 1650 1700<br />

Raman shift (cm -1 )<br />

Figure 3: Tangential mode Raman spectra <strong>of</strong> PP/MWNT (0.5 wt% DMSRDE produced MWNT)<br />

composite fiber (draw ratio 8). From bottom to top, the angle between fiber axis and polarization<br />

direction is 0, 30, 45, 60, 90 degrees<br />

(a) (b) (c)<br />

Figure 4: SEM images <strong>of</strong> PP/MWNT composite fiber<br />

Intensity<br />

800<br />

700<br />

600<br />

500<br />

400<br />

300<br />

200<br />

100<br />

0<br />

-90 -60 -30 0 30 60 90<br />

90<br />

60<br />

45<br />

30<br />

0<br />

PP/MWNT (0.5 wt%) fiber<br />

Angle (degrees)

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