The fatigue failure study of repaired aluminum plates by composite patches using Acoustic Emission

Journal article (2019)

Authors

Abdullah Maleki Amirkabir University of Technology
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
Research Group
Structural Integrity & Composites (Aerospace Engineering) (TU Delft)
Copyright: © 2019 Abdullah Maleki, M. Saeedifar, Mehdi Ahmadi Najafabadi, D. Zarouchas
DOI: https://doi.org/10.1016/j.engfracmech.2017.12.034
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Published Date

2019

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Structural Integrity & Composites

Abstract

The aim of this study is to investigate the failure of cracked aluminum plates repaired by one-side composite patches under fatigue loading using Acoustic Emission (AE) and fractography images. Rectangular specimens made of 6061 aluminum alloy with central through thickness pre-cracks were repaired using glass/epoxy laminated patches. The specimens were subjected to the fatigue loading and AE technique was employed to monitor the effect of the repair patch on the damage progression. First, different stages of damage evolution were studied based on the mechanical data and fractography images. Then, the AE energy utilized to characterize failure process of the specimens. To this aim, AE signals of the aluminum cracking and adhesive layer failure were discriminated according to their energy content. The effect of patch thickness and layup on the failure behavior of the specimens were also studied. Finally, it is concluded that AE is a powerful technique to characterize the failure process of a repaired cracked aeronautic structure by composite patches.

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