Barely visible impact damage assessment in laminated composites using acoustic emission

Journal article (2018)

Authors

M. Saeedifar Structural Integrity & Composites - Aerospace Engineering , Amirkabir University of Technology
Mehdi Ahmadi Najafabadi Amirkabir University of Technology
D. Zarouchas Structural Integrity & Composites - Aerospace Engineering
Hossein Hosseini Toudeshky Amirkabir University of Technology
Meisam Jalalvand University of Bristol, University of Strathclyde
Research Group
Structural Integrity & Composites (Aerospace Engineering) (TU Delft)
Copyright: © 2018 M. Saeedifar, Mehdi Ahmadi Najafabadi, D. Zarouchas, Hossein Hosseini Toudeshky, Meisam Jalalvand
DOI: https://doi.org/10.1016/j.compositesb.2018.07.016
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Published Date

01-11-2018

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Structural Integrity & Composites

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.

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