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8-Ply Lay-up

FIGURE 13.30 Thermal diffusivity and air-coupled through-transmission data for both 8-ply and 16-ply PIP SiC/SiC after 15 PIP cycles: (a) thermal diffusivity maps and (b) air-coupled ultrasound scans.

FIGURE 13.30 Thermal diffusivity and air-coupled through-transmission data for both 8-ply and 16-ply PIP SiC/SiC after 15 PIP cycles: (a) thermal diffusivity maps and (b) air-coupled ultrasound scans.

some of the delam regions, but also there was some infiltration into the delam region that acted as a form of repair. After 10 cycles, additional filling of the delam region is detected. Figure 13.30 shows both thermal diffusivity image data and air-coupled ultrasonic data for both the 8-ply and the 16-ply lay-up samples. While the 16-ply sample is unremarkable for features, the 8-ply specimen demonstrates the correlation between the thermal image data and the air-coupled ultrasonic data. Quantification of the density of this PIP SiC/SiC by the two NDE methods was also examined. A series of test samples were made, each 50 by 50 mm, of 8-ply two-dimensional lay-up. These were examined using both

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