Tuning the properties of functional adhesives with hybrid nanofillers for structural health monitoring

Yang, Xudong; Sun, Lingyu; Huang, Bolong; Zhan, Bowen; Zhang, Cheng; Chu, Yantao; An, Dong

doi:10.1080/00218464.2019.1638771

Cited by 8 publications

(6 citation statements)

References 38 publications

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“…Over the past decades, extensive research has been carried out in this field and a large number of SHM techniques have been developed. Some of the most widely investigated methods for composite joints include intrinsic (embedded within the joint) and extrinsic (located outside the joint) approaches: fiber optic sensors (FOSs), − nanocomposite sensors, − guided waves, , and acoustic emission. − These methods have been developed to identify damage type, location, and severity. For welded TPCs, damage monitoring has so far been limited to guided waves and FOSs. , Therefore, the USW process could further benefit from multifunctional EDs serving two purposes: (1) heat generation at the interface under ultrasonic vibrations and (2) strain and damage sensing under mechanical loading.…”

Section: Introductionmentioning

confidence: 99%

“…Nanocomposite-based sensing with electrically conductive particles is a promising technology for damage monitoring in composite joints. − ,− The use of electrical resistance measurements is based on the change of conductive paths in the polymer composite. Under mechanical strain, the network structures between nanoparticles are modified and lead to a change in electrical resistance, which can provide critical information about the structural integrity of the joints .…”

Section: Introductionmentioning

confidence: 99%

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Electro-Mechanical Response of Ultrasonically Welded Thermoplastic Composite Interfaces under Static and Cyclic Flexural Loads Using Nanocomposites

Palardy

2022

ACS Appl. Polym. Mater.

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In this work, glass fiber/polypropylene adherends were ultrasonically welded with multifunctional nanocomposite polymer films containing multi-walled carbon nanotubes (MWCNTs), embedded at the interface. Their potential for strain and damage monitoring under flexural loading for two different joint configurations was assessed via electrical resistance changes. Cyclic bending tests at various interval durations were first performed on welded single-lap joints to analyze the stability of different MWCNT weight contents (5 wt % to 20 wt %). Subsequently, 3-point bending joints (3PBJs) were welded with single- and double-film configurations and then subjected to static and cyclic loading to assess the monitoring capability through electro-mechanical responses. The 3PBJs welded with nanocomposite films led to an increase in flexural strength by 20.6%. Single-film 3PBJs showed a stable increase in resistance, but load changes corresponding to damage initiation in the specimen were not captured. Pre-cracked single-film welds and double-film welds experienced crack propagation at the welded interface, confirmed through optical microscopy, which resulted in corresponding changes in the resistance curves by up to 300%. Double-film welds were tested under low cyclic flexural loading, which translated into cyclic changes in electrical resistance for the nanocomposite film under tension. Overall, the proposed nanocomposite films show potential to enable ultrasonic welding and integrated sensing at the interface of thermoplastic composite joints.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electro-Mechanical Response of Ultrasonically Welded Thermoplastic Composite Interfaces under Static and Cyclic Flexural Loads Using Nanocomposites

Palardy

2022

ACS Appl. Polym. Mater.

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“…Furthermore, traditional NDT technologies used for adhesive connections, such as the Ultrasound, Acoustic Emissions and Infrared Thermography are time-consuming and incapable of detecting all types of damage. [23][24][25][26][27] Among the various defects present in adhesive joints, weak adhesion, alternatively known as kissing-bonds or zerovolume unbound, is extremely difficult to detect with conventional NDT methods. 28,29 Weak adhesion is presented as a defect in the interface between the adhesive and the adherend, where there may be physical contact between the two, but there is no bonding of the adhesive on the component to be connected.…”

Section: Introductionmentioning

confidence: 99%

A review of structural health monitoring of bonded structures using electromechanical impedance spectroscopy

Tenreiro

Lopes

Silva

2021

Structural Health Monitoring

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The article presents a literature review of electromechanical impedance spectroscopy for structural health monitoring, with emphasis in adhesively bonded joints. The concept behind electromechanical impedance spectroscopy is to use variable high-frequency structural vibrations with piezoelectric elements to monitor the local area of a structure for changes in mechanical impedance that may indicate imminent damage. Various mathematical models that correlate the structural impedance with the electric response of the piezoelectric sensors are presented. Several algorithms and metrics are introduced to detect, localize, and characterize damage when using electromechanical impedance spectroscopy. Applications of electromechanical impedance spectroscopy to study adhesive joints are described. Research and development of alternative hardware for electromechanical impedance spectroscopy is presented. The article ends by presenting future prospects and research of electromechanical impedance spectroscopy–based structural health monitoring, and, while advances have been made in algorithms for damage detection, localization, and characterization, this technology is not mature enough for real-world applications.

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“…Ke et al [22] prepared a novel film adhesive for the bonding of carbon fiber reinforced polymer (CFRP) composites to steel substrates, and the results showed that there was a stronger interfacial bond in the adhesive layer and better adherence than in the intralaminar of CFRPs. The development of technology put forward functional requirements for adhesive materials, such as adhesives with thermal conductivity [23][24][25][26], wave absorption [27], and electromagnetic shielding properties [28,29]. Researchers developed a series of functional adhesives to meet the needs of different fields [30].…”

Section: Introductionmentioning

confidence: 99%

Environmental Resistance and Fatigue Behaviors of Epoxy/Nano-Boron Nitride Thermally Conductive Structural Film Adhesive Toughened by Polyphenoxy

et al. 2021

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The thermally conductive structural film adhesive not only carries large loads but also exhibits excellent heat-transfer performance, which has huge application prospects. Herein, a novel epoxy (Ep) thermally conductive structural film adhesive was prepared using polyphenoxy (PHO) as the toughening agent and film former, boron nitride (BN) nanosheets as the thermally conductive filler, and polyester fabric as the carrier. When the amount of PHO in the epoxy matrix was 30 phr and the content of nano-BN was 30 wt.% (Ep/PHO30/nBN30), the adhesive resin system showed good film-forming properties, thermal stability, and thermal conductivity. The glass transition temperature of Ep/PHO30/nBN30 was 215 °C, and the thermal conductivity was 209.5% higher than that of the pure epoxy resin. The Ep/PHO30/nBN30 film adhesive possessed excellent adhesion and peeling properties, and the double-lap shear strength at room temperature reached 36.69 MPa, which was 21.3% higher than that of pure epoxy resin. The double-lap shear strength reached 15.41 MPa at 150 °C, demonstrating excellent high temperature resistance. In addition, the Ep/PHO30/nBN30 film adhesive exhibited excellent heat-aging resistance, humidity, and medium resistance, and the shear strength retention rate after exposure to the complicated environment reached more than 90%. The structural film adhesive prepared showed excellent fatigue resistance in the dynamic load fatigue test, the double-lap shear strength still reached 35.55 MPa after 1,000,000 fatigue cycles, and the strength retention rate was 96.9%, showing excellent durability and fatigue resistance.

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Tuning the properties of functional adhesives with hybrid nanofillers for structural health monitoring

Cited by 8 publications

References 38 publications

Electro-Mechanical Response of Ultrasonically Welded Thermoplastic Composite Interfaces under Static and Cyclic Flexural Loads Using Nanocomposites

Electro-Mechanical Response of Ultrasonically Welded Thermoplastic Composite Interfaces under Static and Cyclic Flexural Loads Using Nanocomposites

A review of structural health monitoring of bonded structures using electromechanical impedance spectroscopy

Environmental Resistance and Fatigue Behaviors of Epoxy/Nano-Boron Nitride Thermally Conductive Structural Film Adhesive Toughened by Polyphenoxy

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