Figures 26.2 (c) and (d) show the voltage responses for elements 4 and 5 forming another symmetrical pair. They are located close to the centre and are subjected to greater stresses. It is clear from the above figures that in case of delamination in any of the two elements, the stress redistribution will result in substantial increase in stresses in nearby elements. A substantial increase in voltage responses for elements 3 (less than 0.1V to approximately 0.2V) and 5 (0.35V to 0.55V) is predicted when element 4 is assumed to have delamination.

Figure 26.2 (c) Voltage profile for damage in element 4 of interface 1

Figure 26.2 (d) Voltage profile for damage in element 5 of interface 1