ACOUSTIC-EMISSION AT FRACTURE OF ADHESION CONTACTS IN RIGID POLYMERIC COMPOSITES

The possibility of using the acoustic emission (AE) method for the characterization of the process of fracture of adhesion joints in strained rigid polymeric composites is discussed. Recorded as main informational parameters are the total count of AE signals, the count rate, the amplitude distribution of the signals and their frequency characteristics as well as the dependence of these quantities on the stress applied to the sample and on the straining time. Increase in the adhesion bond strength is shown to result in raising the total AE over the whole filler concentration range. The effect of the filler dispersity on the above-listed parameters has been ascertained. A technique for calculating the adhesion joint strength on the basis of the maximum of the AE signal count rate, fracturing stress, and amplitude characteristics of AE signals with allowance for the stress concentration in the formation of a polymeric sample is suggested. © 1991, Taylor & Francis Group, LLC. All rights reserved.