Print Email Facebook Twitter The study of buckling and post-buckling behavior of laminated composites consisting multiple delaminations using acoustic emission Title The study of buckling and post-buckling behavior of laminated composites consisting multiple delaminations using acoustic emission Author Sobhani, Anvar (Amirkabir University of Technology) Saeedifar, M. (TU Delft Structural Integrity & Composites; Amirkabir University of Technology) Najafabadi, Mehdi Ahmadi (Amirkabir University of Technology) Fotouhi, Mohamad (University of the West of England) Zarouchas, D. (TU Delft Structural Integrity & Composites) Date 2018-06-01 Abstract 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. Subject Acoustic emissionBucklingLaminated compositesMultiple delaminationPost-buckling To reference this document use: http://resolver.tudelft.nl/uuid:2ed5d713-f88a-44d8-b0cf-66d1a852833b DOI https://doi.org/10.1016/j.tws.2018.02.011 Embargo date 2018-10-01 ISSN 0263-8231 Source Thin-Walled Structures, 127, 145-156 Bibliographical note Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2018 Anvar Sobhani, M. Saeedifar, Mehdi Ahmadi Najafabadi, Mohamad Fotouhi, D. Zarouchas Files PDF 1_s2.0_S0263823117310285_main.pdf 2.6 MB Close viewer /islandora/object/uuid:2ed5d713-f88a-44d8-b0cf-66d1a852833b/datastream/OBJ/view