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Analysis of the damage mechanisms in mixed-mode delamination of laminated composites using acoustic emission data clustering

Analysis of the damage mechanisms in mixed-mode delamination of laminated composites using acoustic emission data clustering
Analysis of the damage mechanisms in mixed-mode delamination of laminated composites using acoustic emission data clustering
In this study, acoustic emission (AE) technique is used to investigate different time-to-failure mechanisms of delamination in glass/epoxy composite laminates. Woven and unidirectional layups were subjected to the double cantilever beam, end notch flexure, and mixed-mode bending tests and the generated AE signals were captured. Discrimination of the AE events, caused by different types of the damage mechanisms, was performed using wavelet packet transform (WPT) and fuzzy clustering method (FCM) associated with a principal component analysis (PCA). The FCM and WPT analyses identified three dominant damage mechanisms. Furthermore, different interface layups and different GII/GT modal ratio values (ratio of mode II strain energy release rate per total strain energy release rate) indicated different time-to-failure mechanisms incidence. Additionally, the damaged mechanisms were observed using scanning electron microscopic (SEM) analysis. The results showed that the dominant damage mechanisms in all the specimens are matrix cracking and fiber-matrix debonding. Besides, some fiber breakage appeared during the tests, and the percentage of this damage mechanism in the unidirectional specimens and mode I condition was higher than those in the woven specimens and mode II. SEM observations were also in good agreement with the obtained results. It was found that the presented methods can be utilized to improve the characterization and discrimination of damage mechanisms in the actual occurring modes of delamination in composite structures.
acoustic emission, Damage mechanism, fuzzy c-means clustering, laminated composite material, wavelet packet transform
0892-7057
318-340
Fotouhi, Mohamad
71cada36-1cae-451d-8e3a-ab040cc7551a
Sadeghi, Seyedali
4b085ba2-2cdd-4464-94aa-4140f39c6186
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Ahmadi, Mehdi
c974cd4d-bd6e-45c9-aec9-1b8f168cdde4
Fotouhi, Mohamad
71cada36-1cae-451d-8e3a-ab040cc7551a
Sadeghi, Seyedali
4b085ba2-2cdd-4464-94aa-4140f39c6186
Jalalvand, Meisam
21ef0df8-fc7c-4466-a2fc-ee98ed3408a2
Ahmadi, Mehdi
c974cd4d-bd6e-45c9-aec9-1b8f168cdde4

Fotouhi, Mohamad, Sadeghi, Seyedali, Jalalvand, Meisam and Ahmadi, Mehdi (2017) Analysis of the damage mechanisms in mixed-mode delamination of laminated composites using acoustic emission data clustering. Journal of Thermoplastic Composite Materials, 30 (3), 318-340. (doi:10.1177/0892705715598362).

Record type: Article

Abstract

In this study, acoustic emission (AE) technique is used to investigate different time-to-failure mechanisms of delamination in glass/epoxy composite laminates. Woven and unidirectional layups were subjected to the double cantilever beam, end notch flexure, and mixed-mode bending tests and the generated AE signals were captured. Discrimination of the AE events, caused by different types of the damage mechanisms, was performed using wavelet packet transform (WPT) and fuzzy clustering method (FCM) associated with a principal component analysis (PCA). The FCM and WPT analyses identified three dominant damage mechanisms. Furthermore, different interface layups and different GII/GT modal ratio values (ratio of mode II strain energy release rate per total strain energy release rate) indicated different time-to-failure mechanisms incidence. Additionally, the damaged mechanisms were observed using scanning electron microscopic (SEM) analysis. The results showed that the dominant damage mechanisms in all the specimens are matrix cracking and fiber-matrix debonding. Besides, some fiber breakage appeared during the tests, and the percentage of this damage mechanism in the unidirectional specimens and mode I condition was higher than those in the woven specimens and mode II. SEM observations were also in good agreement with the obtained results. It was found that the presented methods can be utilized to improve the characterization and discrimination of damage mechanisms in the actual occurring modes of delamination in composite structures.

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More information

e-pub ahead of print date: 1 March 2017
Published date: 1 March 2017
Keywords: acoustic emission, Damage mechanism, fuzzy c-means clustering, laminated composite material, wavelet packet transform

Identifiers

Local EPrints ID: 446786
URI: http://eprints.soton.ac.uk/id/eprint/446786
ISSN: 0892-7057
PURE UUID: 81984a92-15b5-436c-86f6-646c461cb601
ORCID for Meisam Jalalvand: ORCID iD orcid.org/0000-0003-4691-6252

Catalogue record

Date deposited: 22 Feb 2021 17:33
Last modified: 23 Feb 2021 02:58

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Contributors

Author: Mohamad Fotouhi
Author: Seyedali Sadeghi
Author: Mehdi Ahmadi

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