Damage Characterization of Glass/Epoxy Composite Under Three-Point Bending Test Using Acoustic Emission Technique

Pashmforoush, Farzad; Fotouhi, Mohamad; Ahmadi, Mehdi

doi:10.1007/s11665-011-0013-2

Cited by 37 publications

(30 citation statements)

References 24 publications

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“…It is determined analytically, by "attributing" the AE features to particular damage mechanism like matrix cracking, fiber breakage, debonding, pull-out and delamination, often all examined in one study on a few samples, sometime with complex fiber lay-up. This is not always supported by a convincing experimental evidence [8,9], and the need still exists for a synthetic and reliable indicator of damage onset in fiber composites.…”

Section: Introductionmentioning

confidence: 99%

Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

et al. 2018

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Acoustic emission (AE) was applied for detection of microcrack initiation in carbon fiber reinforced polymer composites subjected to shear stresses. Experimental materials were prepared from polyester bonded unidirectional (1D) non-crimp fabric and 2D plain-weave carbon fiber fabrics, using the resin transfer moulding technology. Control of epoxy resin/carbon textile proportions enabled variation of fiber volume content from small (34/35% for 2D/1D), through medium (51%) to high (68%). Rectangular samples (45 × 4 × 2 mm) were cut from 1D plates along [0] and across [90] fibers. Similar size samples from 2D plates were cut along warp/weft axes as well as in two orthogonal bias directions. Selected side surfaces were polished for microscopic (SEM) observations. Short-beam-strength tests were performed in 3-point bending (l/h=4), with two AE sensors attached for damage monitoring, which allowed to interrupt loading sequence before final failure. The acoustic emission historic index was the most effective AE parameter in damage initiation control. Microcracks developing on polished composite side-surfaces were observed under the SEM and direct microscopic evidence confirmed fiber debonding to be the principal mechanism of crack initiation in these materials and testing conditions before any further damage.

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Section: Introductionmentioning

confidence: 99%

Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

et al. 2018

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“…Furthemore, the frequency ranges of pure epoxy resin and glass fiber bundle under tensile load were investigated and the results indicated that the dominant frequency ranges of the matrix cracking, debonding and fiber breakage are at 140-250 kHz, 250-350 kHz and 350-450 kHz, respectively [9,28,32,33].…”

Section: Multivariable Analysismentioning

confidence: 99%

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

Fotouhi

Sadeghi

Jalalvand

et al. 2016

Journal of Thermoplastic Composite Materials

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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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“…However, different damage mechanisms such as: matrix cracking, fiber breakage and fiber/matrix debonding affect load bearing capacities and operational life of these materials [1][2][3][4][5][6]. Hence, it is very important to investigate composite materials behavior and corresponding failure modes under various loading conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental–numerical study on minimizing impact induced damage in laminated composites under low-velocity impact

Pashmforoush

Fotouhi

Sarhan

2017

Journal of Reinforced Plastics and Composites

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In this study, an experimentally validated numerical analysis was performed toward optimization of stacking sequence in multidirectional laminated composites subjected to low velocity impact. For this purpose, an optimization program was developed by integrating Finite Element Method (FEM) and Multi Objective Genetic Algorithm (MOGA) using modeFRONTIER. In this regard, three objective functions were defined; one, based on Hashin failure theory and two others based on interlaminar shear and tensile stresses. These objective functions were aimed to be optimized through tailoring ply angles with special focus on minimizing impact induced damage. The obtained results indicated that the proposed optimization method is an effective tool for optimizing stacking sequence of laminated fiber reinforced composite materials.

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Damage Characterization of Glass/Epoxy Composite Under Three-Point Bending Test Using Acoustic Emission Technique

Cited by 37 publications

References 24 publications

Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

Acoustic Emission from Microcrack Initiation in Polymer Matrix Composites in Short Beam Shear Test

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

Experimental–numerical study on minimizing impact induced damage in laminated composites under low-velocity impact

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