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Acoustic Emission Characteristics of Single-Edge-Notched Glass Fiber/Aluminum Hybrid Laminates

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Abstract:

Acoustic emission (AE) characteristics have been studied for single-edge-notched monolithic thin aluminum (Al) plates and glass fiber/Al hybrid laminates. Traveling microscope was used for observing the plastic deformation and damage zone around the initial notch tip. Frequency characteristics of AE signals processed by fast Fourier transform (FFT) from monolithic Al could be classified into two different types. Type I signal had a relatively low frequency band of 96~260kHz, while Type II signal had broad band frequencies of 192~408kHz. In case of glass fiber/Al hybrid laminates, AE signals with high amplitude (>80dB) and long duration (>2msec) were additionally confirmed on FFT frequency analysis, which corresponded to macro-crack propagation and/or delamination between aluminum layer and glass fiber layer. Also, distributions of the first and the second peaks in frequency spectrum were related with local fracture behaviors of the hybrid laminates. AE source location determined by signal arrival time showed the extent of fracture zones. On the basis of the above AE analysis, characteristic features of fracture processes of single-edge-notched glass fiber/aluminum laminates were elucidated according to different fiber orientations.

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Periodical:

Key Engineering Materials (Volumes 306-308)

Pages:

19-24

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.306-308.19

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Online since:

March 2006

Authors:

Sung Choong Woo, Dae Joon Kim, Nak Sam Choi

Keywords:

Acoustic Emission (AE) Characteristic, First Peak Frequency, Fracture Process, Glass Fiber/Aluminum Hybrid Laminates, Second Peak Frequency

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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