Figure 26.3 (c) Voltage profile for damage in element 4 of interface 3

Figure 26.3 (d) Voltage profile for damage in element 5 of interface 3

It can be stated that in general, voltage response in piezoelectric patch can give a good reflection of the state of the composite laminate when compared with the response for the healthy laminate and a qualitative estimation of damage can be predicted using piezo- sensory patches.