Acoustic structural health monitoring of composite materials : Damage identification and evaluation in cross ply laminates using acoustic emission and ultrasonics

Aggelis, D. G.; Barkoula, N.-M.; Matikas, Theodore E.; Paipetis, Alkiviadis S.

doi:10.1016/j.compscitech.2011.10.011

Cited by 125 publications

(72 citation statements)

References 15 publications

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“…The acoustic emission technique was employed for the dynamic monitoring of the fragmentation process with the load application. This allowed for the recording and the location of the fragmentation process in real time, as has been already performed in cross ply laminates . Most importantly, the use of acoustic emission eliminated the unwanted effects of stress relaxation inherently present in typical stop and go microscopic examinations, which may lead to underestimation of the interfacial shear stress .…”

Section: Introductionmentioning

confidence: 99%

Carbon nanotube growth on high modulus carbon fibres: Morphological and interfacial characterization

Boura

Diamanti

Grammatikos

et al. 2013

Surface & Interface Analysis

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Carbon nanotubes (CNTs) were grown directly on the surface of carbon fibres, using the catalytic chemical vapour deposition. FeCo bimetallic catalysts were deposited on carbon fibres using a simple wet impregnation method. CNTs were synthesized over the prepared catalysts by the catalytic decomposition of acetylene at 750 o C. The uniform CNT formation on the fibre surface was verified using scanning electron microscopy. Raman spectroscopy was employed to evaluate non-destructively the CNT growth and the CNT quality. Thermo gravimetric analysis and differential thermal analysis were employed as destructive methods to confirm the spectroscopic data. Single CNT-coated fibre fragmentation tests were performed to examine the interfacial shear strength (ISS) of the modified fibres. Acoustic emission was employed to monitor the fragmentation process in real time. Thus, the coated fibre structural integrity was assessed together with its stress transfer properties. Polarized optical microscopy was employed to cross validate the acoustic emission data. It was found that the ISS of the nanotube-reinforced interphase was improved without affecting the fibre mechanical properties.

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Section: Introductionmentioning

confidence: 99%

Carbon nanotube growth on high modulus carbon fibres: Morphological and interfacial characterization

Boura

Diamanti

Grammatikos

et al. 2013

Surface & Interface Analysis

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“…Piezoelectric transducers placed on the surface of the material capture the elastic waves released during crack propagation incidents [45]. Information about the location and the structural severity are available through acoustic signal tracking [46]. Different forms of damage in composite materials under mechanical loading have been identified by many researchers [47,48].…”

Section: Overview Of Benchmarking Techniquesmentioning

confidence: 99%

Real-Time Debonding Monitoring of Composite Repaired Materials via Electrical, Acoustic, and Thermographic Methods

Grammatikos

Kordatos

Matikas

et al. 2013

J. of Materi Eng and Perform

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Electrical properties of composite materials have been thoroughly investigated recently for the detection and monitoring of damage in Carbon Fibre Reinforced Polymers (CFRPs) under mechanical loading. Carbon Nanotubes (CNTs) are incorporated in the polymer matrix of CFRPs for the enhancement of their electrical properties. The electrical properties have shown to be sensitive to the damage state of the material and hence their monitoring provides the profile of their structural deterioration. The aim of the paper is the cross validation and benchmarking of an Electrical Potential Change Monitoring (EPCM) technique against Acoustic Emission (AE) and Lock-in Thermography (LT). All techniques successfully identified damage and its propagation. Thermography was more efficient in quantifying damage and describe dynamically the debond topology, as it provided full 2D imaging of the debond in real time. EPCM was both successful in providing quantitative information on debond propagation and its directionality. AE provided consistent information on damage propagation. All techniques identified three stages in the fatigue life of the interrogated coupons. The representation of the fatigue behavior as a function of life fraction, the correlation of AE data with EPCM and LT data and most importantly the consistent behavior of all tested coupons allowed for both the direct and indirect cross correlation of all employed methodologies, which consistently identified all aforementioned fatigue life stages.

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“…Ultrasound transducers have been widely used in many applications, such as the non-destructive testing (NDT) [1][2], medical ultrasound imaging applications [3][4] and so on. Comparing to the traditional Piezoelectric (PZT) ultrasound transducers, the fiber optic transducers are more suitable for multiple testing, due to their compact size, light weight, wide bandwidth, can survive in harsh environment, EMI-immunity (electromagnetic interference immunity), remote sensing capability.…”

Section: Introductionmentioning

confidence: 99%

Ultrasound generation from an optical fiber sidewall

Zhou

Shi

et al. 2016

SPIE Proceedings

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Ultrasound generation from an optical fiber, based on the photoacoustic principle, could have broad applications, such as ultrasound nondestructive test (NDT) and biomedical ultrasound imaging. There are many advantages of these fiberoptic ultrasonic transducers, such as small size, light weight, ease of use, and immunity to electromagnetic interference. This paper will demonstrate a novel structure which the ultrasound signal is generated on the sidewall of the fiber. Two experimental configurations of the fiber-optic sidewall ultrasonic transducer are discussed. One is that a photoacoustic material is directly coated on the sidewall of the optical fiber. The other one is that the photoacoustic material is directly coated on an aluminum plate and the sidewall fiber is buried in the material. By using this novel sidewall ultrasound generator, we can effectively generate ultrasound signal at multiple, particular locations along one fiber.

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Acoustic structural health monitoring of composite materials : Damage identification and evaluation in cross ply laminates using acoustic emission and ultrasonics

Cited by 125 publications

References 15 publications

Carbon nanotube growth on high modulus carbon fibres: Morphological and interfacial characterization

Carbon nanotube growth on high modulus carbon fibres: Morphological and interfacial characterization

Real-Time Debonding Monitoring of Composite Repaired Materials via Electrical, Acoustic, and Thermographic Methods

Ultrasound generation from an optical fiber sidewall

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