Closed disbond detection in marine glass-epoxy/balsa composites

Teles, Sorin V.; Chimenti, Dale E.

doi:10.1016/j.ndteint.2007.08.003

Cited by 10 publications

(6 citation statements)

References 15 publications

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“…Due to the viscoelastic properties of SIR and the roughness of GFRP, the early stage of micro-debonding without continuously distributed air gap can be observed by optical microscopy (see Section 3) as a partially close interface. This special and essential type of defect is known as kissing defect, which occurs when the adhesive and the adherent are in direct physical contact but lack strong chemical bond [18][19][20]. Regretfully, kissing defects remain challenging to detect due to the variety of material and structure of adhesive joints.…”

Section: Kissing Defect: Early Stage Of Micro-debondingmentioning

confidence: 99%

Non‐destructive testing method of micro‐debonding defects in composite insulation based on high power ultrasonic

et al. 2019

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It is crucial to ensure the adhesive quality of the interface in composite insulation equipment for power grid security. Due to viscoelasticity of silicone rubber and roughness of interface, the thickness of the local air layer in the defective interface is <100 μm. This kind of defect is called micro-debonding defect in this paper, and it is significantly smaller than the millimetrescale air gaps which could be defected by the x-ray, THz, and traditional ultrasonic method. It remains challenging to detect the micro-debonding in composite insulation by non-destructive testing methods. In this paper, the acoustic model and bi-linear stiffness model for micro-debonding in different stages are established. Accordingly, a conjecture is proposed that the bonding property of composite insulation is related to the acoustic impedance of interface and non-linear distortion of its constitutive relation. The result obtained from numerical simulation with and without defect is compared with the high-power ultrasonic experimental data to validate the correctness of the theoretical model. In addition, it can be concluded that the non-linear distortion of high-power ultrasonic wave can be effectively used to diagnose micro-debonding defect at the interface of composite insulation in its early stage (1-20 μm).

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Section: Kissing Defect: Early Stage Of Micro-debondingmentioning

confidence: 99%

Non‐destructive testing method of micro‐debonding defects in composite insulation based on high power ultrasonic

et al. 2019

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“…Balsa wood is also among the most frequently studied bio-based cores due to its high specific compressive and shear properties [10][11][12]. It has often been used in marine applications reinforced with GFRP [13]. Le Duigou et al [14] have studied a fully bio-based sandwich made of polylactic acid (PLLA)/flax skins and a balsa core manufactured in a single-step thermocompression process.…”

Section: Introductionmentioning

confidence: 99%

“…Balsa wood is also among the most frequently studied bio-based cores due to its high specific compressive and shear properties [10–12]. It has often been used in marine applications reinforced with GFRP [13]. Le Duigou et al.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static and fatigue properties of a balsa cored sandwich structure with thermoplastic skins reinforced by flax fibres

Monti

Mahi

Jendli³

et al. 2018

Jnl of Sandwich Structures & Materials

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is an open access repository that collects the work of Arts et Métiers ParisTech researchers and makes it freely available over the web where possible. This is an author-deposited version published in: https://sam.ensam.eu Handle ID: .http://hdl.handle.net/10985/17596 To cite this version :Arthur MONTI, Abderrahim EL MAHI, Zouhaier JENDLI, Laurent GUILLAUMAT -Quasi-static and fatigue properties of a balsa cored sandwich structure with thermoplastic skins reinforced by flax Abstract This paper presents the results of several experimental analyses performed on a biobased sandwich structure. The material studied is made up of thermoplastic skins reinforced by flax fibres and applied to a balsa core. It is produced by a single-step liquid resin infusion process. First, the skin-core interfacial properties were measured and compared with those of the existing materials. Then, several quasi-static and dynamic analyses were performed to study the flexural behaviour of sandwich beams. The elastic and ultimate properties of the skins and core were deduced from these flexural tests. In addition, a failure mode map was developed based on the existing theories to explain the failure modes observed under different boundary conditions. The influence of the statistical spread of the core's mechanical properties on the failure of sandwich beams was considered. Moreover, fatigue analyses were conducted to determine the fatigue resistance of this bio-based structure. Its behaviour was compared with that of the previously tested non-bio-based sandwich beams.Finally, the fatigue loss factor evolution of this structure under several loading ratios was measured and discussed. This study aims to determine some of the main mechanical properties of this material to see whether or not it might be suitable for industrial applications currently using glass fibre reinforced polymer/foam cored sandwich structures.

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“…32 A significant amount of literature is available on kissing bonds. 33–38 Attempts are being made to evaluate kissing bonds particularly utilizing advanced ultrasonic techniques like non-linear acoustics, which proved highly effective. 38–42 To assess the joint/bond integrity and the structural health state, in recent years, considerable amount of work has been done to develop effectively and on time non-destructive evaluation (NDE) techniques.…”

Section: Introductionmentioning

confidence: 99%

Identification of an effective nondestructive technique for bond defect determination in laminate composites—A technical review

Asif

Khan

et al. 2018

Journal of Composite Materials

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Laminate composites are commonly used for the production of critical mechanical structures and components such as wind turbine blades, helicopter rotors, UAV wings and honeycomb st ructures for aircraft wings. During the manufacturing process of these composite structures, z ones or areas with weak bond strength are always an issue which may affect the strength and p erformance of components. The identification and quantification of these zones are always ch allenging and necessary for the mass production. Non-destructive testing (NDT) methods avai lable, including ultrasonic A, B, and C-Scan, laser shearography, X-ray tomography and ther mography can be useful for the mentioned purposes. However, a comparison of these techniq ues concerning their capacity of identification and quantification of bond defect still needs a comprehensive review. In this paper, a detailed comparison of several NDT techniques is provided. Emphasis is placed to institute a guideline to select the most suitable technique for the identification of zones with bond defects in laminated composites. A literature review of NDT techniques informs us that the ultrasonic-based testing techniques are more effective for providing bond defect information as compared to their non-ultrasonic counterparts. Experimental tests on different

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Closed disbond detection in marine glass-epoxy/balsa composites

Cited by 10 publications

References 15 publications

Non‐destructive testing method of micro‐debonding defects in composite insulation based on high power ultrasonic

Non‐destructive testing method of micro‐debonding defects in composite insulation based on high power ultrasonic

Quasi-static and fatigue properties of a balsa cored sandwich structure with thermoplastic skins reinforced by flax fibres

Identification of an effective nondestructive technique for bond defect determination in laminate composites—A technical review

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