5.4 Detectability of Flaws in Anisotropic Media: Application to Ti64
141
Fig. 5.15 A model of a notch
in Ti64. The host is isotropic
with a conductivity of
σ = 6.04 × 10 5 S/m, which
is typical of Ti64. The two
anisotropic patches differ
only in the exchange of σ 11
and σ 22 . These values are
those for Ti64 with 6 mm
symmetry
Host: σ=6.04Ε5
Coil
Coil
Anisotropic Patch
Notch
Notch
σ 11
σ 22 = 5.90
σ 33 = 6.04
σ 11 = 5.90
σ 22 = 6.04
σ 33 = 6.04
= 6.04Ε5
E5
E5
E5
E5
E5
0.016
0.018
0.02
0.022
0.024
0.026
0.028
-0.0065
-0.006
-0.0055
-0.005
-0.0045
-0.004
-0.0035
-0.003
-0.0025
-0.002
X
R
Comparision of Anisotropic Patch-Only Responses
Top
Bottom
Fig. 5.16 The impedance-plane response at 2 MHz for the ‘patch only’ configuration, in which
the notch is omitted in Fig. 5.15. The labels ‘Top’ and ‘Bottom’ refer to the top and bottom models
in Fig. 5.15