Damage analysis for low velocity impacted composite laminates using acoustic emission technique

Abstract

Characterization of dynamic induced damage is one of the most controversial issues in the application of composite structures. To this aim, Acoustic Emission (AE) technique has been qualified as a robust tool for damage sequence analysis due to its high sensitivity to damage mechanisms. First, AE reference map was created using a couple analysis of Fuzzy C-Means (FCM) clustering and Principal Component Analysis (PCA). The low velocity impact tests were then conducted on composite plates. Finally, Impact AE signals were discriminated and the sequence of damage mechanisms during impact process was discovered. As a result, it is concluded that AE method accompanied with the presented method is a new appropriate approach to discriminate damage mechanism sequences in impacted composite specimens.

Statističke analogije između potresa, mikropotresa u metalima i lavina u 1D Burridge-Knopoff modelu

“…If ones take the squared valued signal, corresponding to dissipated energy timeseries and integrates, the area difference between the highest signal and the total data batch is insignificant. Nevertheless, before every batch of experiments the detectors are recalibrated with a pencil lead breaking test, which in ideal case produces a characteristic curve of the test (Sause, 2011;Yousefi, 2018). With this test, one can also check the reliability of the AE detectors, by comparing the results of several tests carried out successively.…”