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The study of buckling and post-buckling behavior of laminated composites consisting multiple delaminations using acoustic emission

Sobhani, Anvar; Saeedifar, Milad; Najafabadi, Mehdi Ahmadi; Fotouhi, Mohamad; Zarouchas, Dimitrios

The study of buckling and post-buckling behavior of laminated composites consisting multiple delaminations using acoustic emission Thumbnail


Authors

Anvar Sobhani

Milad Saeedifar

Mehdi Ahmadi Najafabadi

Dimitrios Zarouchas



Abstract

© 2018 Elsevier Ltd This study introduces a comprehensive set of designed and tested glass/epoxy composites, AE monitoring and signal processing techniques; (i) to investigate the effect of multiple delaminations on buckling and post-buckling behaviors of laminated composites and (ii) to evaluate Acoustic Emission (AE) technique ability to monitor the buckling delamination growth and to classify the occurred damage mechanisms. The pre-delaminations were made by inserting a Teflon film at the plies interfaces during fabrication. Three different types of specimens were fabricated and subjected to compression loading to study the effects of the location, the number of delaminations, and the thickness of the Teflon film on buckling and post-buckling behaviors of the specimens. The mechanical results showed that the number of delaminations has a major effect on the critical and maximum loads and the location of delamination and the thickness of the Teflon film have minor effects on the critical and maximum loads. The AE signals of the specimens were then classified using Gaussian Mixture Model (GMM) and the evolution of different damage mechanisms was investigated. The AE results showed that AE is a robust technique to classify damage mechanisms in buckling of laminated composites and could identify delamination propagation earlier and with a lower standard deviation, compared with the conventional methods.

Citation

Sobhani, A., Saeedifar, M., Najafabadi, M. A., Fotouhi, M., & Zarouchas, D. (2018). The study of buckling and post-buckling behavior of laminated composites consisting multiple delaminations using acoustic emission. Thin-Walled Structures, 127, 145-156. https://doi.org/10.1016/j.tws.2018.02.011

Journal Article Type Article
Acceptance Date Feb 8, 2018
Online Publication Date Feb 14, 2018
Publication Date Jun 1, 2018
Deposit Date Feb 14, 2018
Publicly Available Date Feb 15, 2019
Journal Thin-Walled Structures
Print ISSN 0263-8231
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 127
Pages 145-156
DOI https://doi.org/10.1016/j.tws.2018.02.011
Keywords buckling, post-buckling, multiple delamination, laminated composites, acoustic emission
Public URL https://uwe-repository.worktribe.com/output/875976
Publisher URL http://dx.doi.org/10.1016/j.tws.2018.02.011

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