Investigation of the Influence of Multi-Walled Carbon Nanotubes on Laminate Composites During Progressive Tensile Damage Using Acoustic Emission

Pei, Ning
Shang, Junjun
Xu, Chunguang
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Springer Nature
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Aerospace Engineering
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Mechanical Engineering
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Aerospace EngineeringMechanical EngineeringCenter for Nondestructive Evaluation
Progressive tensile damage for carbon fiber composites both containing and without multi-walled carbon nanotubes (MWCNTs) is discussed and this work is an extension of a previously published study. The composite specimens were subjected to progressive tensile experiments, and AE signals were collected during loading. The signals were post-processed using cluster analysis based on the Fuzzy C-Means algorithm. The results show that AE signals can be divided into three classes, corresponding to three damage modes: matrix cracking, fiber debonding, and fiber breakage. The AE peak frequency characteristics of each damage mode were found. Samples were also characterized using micro-computed tomography (Micro-CT) imaging and the observed damage shows good correlation with AE signal characterization for defect class prediction. Analyzing the data clusters it can be found that MWCNTs can delay and in some cases prevent both matrix cracking and fiber debonding in laminate composites. It was found that matrix cracking, debonding and fiber break AE signals for composites with CNTs correspond to a higher frequency range than that without CNTs. The results give guidance for composite design when considering MWCNTs and structure health monitoring of these composite materials.
This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: Copyright 2021 The Author(s). Posted with permission.
MWCNTs, Progressive tensile damage, Acoustic emission, Micro-computed tomography, Carbon fibers