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Fig. 9.12 A detail of the
F.E.M. mesh
Fig. 9.13 Residual stress for
a coating manufactured with
wet enameling procedure
to X/l = 0.5, is reported. A zone of tension in the steel substrate and compression
stress in the coating are also evidenced.
However, differently from an analogous theoretical coating devoid of bubbles,
whose trend of the residual stress is also reported in the figure, higher values of
stress exist in the real structure of the coating due to the bubbles. A detail
of Fig. 9.13 , reported in Fig. 9.14 b, shows the zone where the maximum value of
stress was measured in the coating.
A similar analysis was conducted on cross-section micrographs relative to the
enameled coatings manufactured using the dry enameling technique.
Figure 9.15 reports the gray-scale map of the stress in the longitudinal direction
obtained for a representative image.
It can be observed that the maximum values of the residual stress measured in
the material are lower than those obtained for the coating produced with the wet
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