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It has a great effect of defect on damping. The defect at the interface is larger, the energy dissipation is increased, so that the damping is larger. Therefore, further analyze the relationship between the defect and thickness at the interfacial region between substrate and coating. The ratio of the interface defect (D) to interface thickness (T) stand for the defect rate of unit thickness at the interfacial region, it can concluded that obtained the defect rate of unit thickness at the interfacial region for the different samples as:

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Due to the close relationship between defects and damping that an increase in the amount of defects at the interface can increase energy dissipation, thus resulting in greater damping, the relationship between the defect and thickness at the interfacial region between the substrate and the coating was further analyzed. The ratio of the interface defect (D) to interface thickness (T) stands for the defect rate per unit thickness at the interfacial region. And the defect rate per unit thickness at the interfacial region for the different samples were derived respectively.
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Damping is greatly affected by defects, i.e. the larger the defects at the interface, the larger the damping value is as the energy dissipation is increased. Therefore, through further analysis of the relationship between the defects and thickness at the interfacial region between substrate and coating from Figure 2, using the ratio of the interface defect (D) to interface thickness (T) to indicate the defect rate of unit thickness at the interfacial region, it is obtained that the defect rates of unit thickness at the interfacial region for the different samples are as follows:
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