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Application of acoustic emission to detect damage mechanisms of particulate filled thermoset polymeric coatings in four point bend tests

Particulate-filled thermoset polymeric coatings with two different coating thicknesses were subjected to four-point bend loading while being monitored by acoustic emission in order to establish their failure modes. The number and amplitude of the acoustic emission events were investigated and correlated with the failure mechanisms present during the four-point bend test, such as debonding of the embedded fillers, delamination of the coating layer from the substrate and the initiation and propagation of cracks. This then allows the failure modes of particulate-filled thermoset coatings and their location to be identified from the acoustic emission detected during the four-point bend test.