Recognition of Damage Modes and Hilbert–Huang Transform Analyses of 3D Braided Composites

Gang Ding, Liankun Sun, Zhenkai Wan, Jialu Li, Xiaoyuan Pei, Youhong Tang

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Abstract

The identification and classification of acoustic emission (AE) based failure modes are complex due to the fact that AE waves are generally released simultaneously from all AE-emitting damage sources. To fully understand the occurrence of damage and the damage evolution law of 3D braided composites, the tensile response characteristics and failure mechanisms of such composites were revealed by experiments, followed by frequency domain analyses. The results indicated good correlation between the number of AE events and the evolution of damage in 3D braided composites. After an AE signal was decomposed by the Hilbert–Huang transform (HHT) method, it might extract and separate all damage modes included in this AE signal. Additionally, the frequency saltation in the HHT spectra implied changes in the failure mode of the 3D braided composites. This study provides an effective new method for the analysis of the tensile fracture mechanism in 3D braided composites.
Original languageEnglish
Article number65
Number of pages16
JournalJournal of Composites Science
Volume2
Issue number4
DOIs
Publication statusPublished - Dec 2018

Keywords

  • Acoustic emission
  • Hilbert–Huang transform (HHT)
  • Numerical analysis
  • Polymer-matrix composites

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