Print Email Facebook Twitter Barely visible impact damage assessment in laminated composites using acoustic emission Title Barely visible impact damage assessment in laminated composites using acoustic emission Author Saeedifar, M. (TU Delft Structural Integrity & Composites; Amirkabir University of Technology) Najafabadi, Mehdi Ahmadi (Amirkabir University of Technology) Zarouchas, D. (TU Delft Structural Integrity & Composites) Toudeshky, Hossein Hosseini (Amirkabir University of Technology) Jalalvand, Meisam (University of Strathclyde; University of Bristol) Date 2018-11-01 Abstract Despite the key advantages of Fiber Reinforced Polymer (FRP) composites, they are susceptible to Barely Visible Impact Damage (BVID) under transverse loadings. This study investigates BVID in two quasi-isotropic carbon/epoxy laminates under quasi-static indentation and Low-Velocity Impact (LVI) loadings using Acoustic Emission (AE). First, the evolution of interlaminar and intralaminar damages is studied by analyzing the AE signals of the indentation test using b-value and sentry function methods. Then, the specimens are subjected to the LVI loading and the induced damages are compared with the indentation test and the percentage of each damage mechanism is calculated using Wavelet Packet Transform (WPT). In consistent with the mechanical data, ultrasonic C-scan and digital camera images of the specimens, the AE results show a considerable similarity between the induced BVID under quasi-static indentation and LVI tests. Finally, the obtained results show that AE is a powerful tool to study BVID in laminated composites under quasi-static and dynamic transverse loadings. Subject Acoustic emissionB-valueBarely visible impact damageIndentationLaminated compositesLow-velocity impactSentry functionWavelet packet transform To reference this document use: http://resolver.tudelft.nl/uuid:afdb405a-d607-48f7-af44-4ff58df2bd2d DOI https://doi.org/10.1016/j.compositesb.2018.07.016 Embargo date 2019-01-01 ISSN 1359-8368 Source Composites Part B: Engineering, 152, 180-192 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 M. Saeedifar, Mehdi Ahmadi Najafabadi, D. Zarouchas, Hossein Hosseini Toudeshky, Meisam Jalalvand Files PDF 1_s2.0_S1359836818315804_main.pdf 4.2 MB Close viewer /islandora/object/uuid:afdb405a-d607-48f7-af44-4ff58df2bd2d/datastream/OBJ/view