Structural health monitoring for GFRP composite by the piezoresistive response in the tufted reinforcements

Martins, A.T.; Aboura, Zoheir; Harizi, Walid; Laksimi, A.; Khellil, Kamel

doi:10.1016/j.compstruct.2018.10.091

Cited by 19 publications

(13 citation statements)

References 49 publications

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“…This tightening of the braid structure is reasonably expected to increase the number and contact cross section of electrical connections along the length of the braid. Other studies investigating the electrical resistance of carbon fibre z-pin and tufts have also experience a similar response due to initial loading [3], [43].…”

Section: Electrical Conductivity Of Micro-braided Threadsmentioning

confidence: 77%

Multi-material Braids for Multifunctional Laminates: Conductive Through-thickness Reinforcement

O’Keeffe

Pickard

Cao

et al. 2020

Preprint

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Conventional carbon fibre laminates are known to be moderately electrically conductive in-plane, but have a poor through-thickness conductivity. This poses a problem for functionality aspects that are of increasing importance to industry, such as sensing, current collection, inductive/resistive heating, electromagnetic interference (EMI) shielding, etc. This restriction is of course more pronounced for non-conductive composite reinforcements such as glass, organic or natural fibres. Among various solutions to boost through-thickness electrical conductivity, tufting with hybrid micro-braided metal-carbon fibre yarns is one of the most promising. As a well-characterised method of through thickness reinforcement, tufting is easily implementable in a manufacturing environment. The hybridisation of materials in the braid promotes the resilience and integrity of yarns, while integrating metal wires opens up a wide range of multifunctional applications. Many configurations can be produced by varying braid patterns and the constituting yarns/wires. A predictive design tool is therefore necessary to select the right material configuration for the desired functional and structural performance. This paper suggests a fast and robust method for generating finite-element models of the braids, validates the prediction of micro-architecture and electrical conductivity, and demonstrates successful manufacturing of composites enhanced with braided tufts.

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Section: Electrical Conductivity Of Micro-braided Threadsmentioning

confidence: 77%

Multi-material Braids for Multifunctional Laminates: Conductive Through-thickness Reinforcement

O’Keeffe

Pickard

Cao

et al. 2020

Preprint

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“…However, in the majority of relevant papers, the results of experimental laboratory tests done on small specimens or coupons and numerical simulations are presented. These results are easily available in many journals and selected recent examples of this research can be found in references [11][12][13][14][15][16][17][18]. Similar papers dealing with problems on a slightly bigger scale (aircraft panels) are available in references [19,20].…”

Section: Introductionmentioning

confidence: 94%

Short and Long Term Measurements in Assessment of FRP Composite Footbridge Behavior

2020

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The paper presents application of different sensors for the purpose of short and long term measurements, as well as a structural health monitoring (SHM) system to assess the behavior of a novel fiber reinforced plastics (FRP) composite footbridge. The aim is to present a thorough and concise description of these sensors networks and results gathered with their aid during in situ measurement of strains, displacements, and vibrations, as only a few works are available in this field. The bridge geometry, material solutions, and properties are described at first. Then the measurement devices composing the system and subsystems of sensors are elaborated on. Subsequently, the bridge research program is described and the results are shown and discussed. Finally, it is concluded that the use of selected sensors is helpful in assessment of the behavior of the novel structure, and moreover in validation of its numerical models. The collected data confirmed many assumptions made during the bridge design process and allowed us to accept it for exploitation.

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“…In-situ monitoring, though, has some disadvantages, such as manufacturing/embedding difficulties [24], or intrusiveness risks as the integrated device may degrade the mechanical properties of the monitored part [25]. Different types of devices have already been embedded into composite structures to perform insitu SHM, such as optical fibers ( [26,27]: monitoring of cracks), or piezoresistive elements including conductive fiber reinforcement ( [28]: delamination identification), conductivecoated fibers ( [29]: strain monitoring under cyclic flexural loading), nanofillers ( [30]: relation electrical resistance vs. mechanical loading [31]: uniaxial tension-tension fatigue monitoring), Z-pins ( [32]: delamination crack surveillance), and tuft threads ( [33]: tufted 'Omega' stiffener monitoring). Piezoelectric devices are also particularly investigated in the in-situ SHM literature, with the use of PolyVinylidene Fluoride (PVDF) [34] or Lead Zirconate Titanate (LZT or PZT) [17] as primary base materials.…”

Section: Introductionmentioning

confidence: 99%

Integration of piezoelectric transducers (PZT and PVDF) within polymer-matrix composites for structural health monitoring applications: new success and challenges

Tuloup

Harizi

Aboura

et al. 2020

International Journal of Smart and Nano Materials

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This article investigates the interest of using in-situ piezoelectric (PZT and PVDF) disks to perform real-time Structural Health Monitoring (SHM) of glass fiber-reinforced polymer composites submitted to various tensile loadings. The goal is to evaluate the working range and SHM potential of such embedded transducers for relatively simple mechanical loadings, with the long-term aim of using them to monitor complete 3D structures submitted to more complex loadings. SHM is performed acquiring the electrical capacitance variation of the embedded transducers. To study the potential links between the insitu capacitance signal and the global response of the loaded host specimens, a multi-instrumentation composed of external Nondestructive Testing techniques was implemented on the surfaces of the specimens to search for multi-physical couplings between these external measurements and the capacitance curves. Results confirmed the non-intrusiveness of the embedded transducers, and allowed estimating their working domain. PZT capacitance signal follows well the mechanical loadings, but the piezoceramic transducer gets damaged after a determined relatively low strain level due to its brittleness. The limits of this working domain are extended by using a stretchable PolyVinylidene Fluoride (PVDF) polymer transducer, allowing this one to perform in-situ and real-time SHM of its host tensile specimens until failure.

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Structural health monitoring for GFRP composite by the piezoresistive response in the tufted reinforcements

Cited by 19 publications

References 49 publications

Multi-material Braids for Multifunctional Laminates: Conductive Through-thickness Reinforcement

Multi-material Braids for Multifunctional Laminates: Conductive Through-thickness Reinforcement

Short and Long Term Measurements in Assessment of FRP Composite Footbridge Behavior

Integration of piezoelectric transducers (PZT and PVDF) within polymer-matrix composites for structural health monitoring applications: new success and challenges

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