As seen from Fig. 4, coating damage is serious when the coating
layer thickness is thinner. A conclusion can be drawn that substrate
influence can be eliminated for relatively thick coatings. In order to
analyze the stress variation in the coating and substrate interface,
the article selects the interface element no. 4608 for analysis. It is
noticeable from Fig. 5 that the value of maximum effective strain is
almost to zero at about 100 μm. At this time, the basic matrix is not
destroyed. Combining with Fig. 6, it can be seen that the effective
stress levels are quite high, exceeding the tensile strength of
known coating materials. In addition, a plateau in stress level is observed
when the coating thickness is thicker (about 120 μm in the
example provided).