Developments in Ceramic Materials Research

194
M. A. Sheik
thermal property derived from the experimental data, given in Figure 19, a 50% reduction is
shown to have occurred due to matrix cracking.
Non-Dimensional
Thermal Diffusivity
0.995
0.99
0.985
0.98
0.975
0.97
0.965
0.96
0.955
0 2 4 6 8 10 12 14 16
Crack Density (R /p)
f
Figure 18. Degradation of through-thickness thermal diffusivity with increasing crack density due to
external mechanical loading. ‘R f’ represents the tow diameter and ‘p’ denotes the periodicity of matrix
cracks.
Figure 19. Experimental results for the degradation of thermal diffusivity of the DLR-XT CMC
material with external mechanical loading.