Fabrication and analysis of integrated multifunctional MWCNTS sensors in glass fiber reinforced polymer composites

Shahbaz, Shah Rukh; Berkalp, Ömer Berk; Hassan, Syed Zameer Ul; Siddiqui, Muhammad Saqib; Bangash, Muhammad Kashif

doi:10.1016/j.compstruct.2020.113527

Cited by 18 publications

(9 citation statements)

References 32 publications

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“…These positive Δ R / R 0 are caused by disruption of the electrical network of CNTs due to the presence of a combined state of stresses that yield matrix microcracking and fiber breakage during the bending test. 15 As for the location, the fact that the largest peaks of Δ R / R 0 occur at electrodes 1a–3a, 2a–3a, and 3a–3b is associated with damage originated in the central region of the specimen subjected to the maximum bending moment (see DIC maps for ε x in Figure 3(b)). After the unloading stage (U) of each cycle, it is observed that the values of Δ R / R 0 go beyond zero (Δ R / R 0 < 0), indicating permanent changes in the electrically conductive network after a significant number of cyclic loadings.…”

Section: Resultsmentioning

confidence: 99%

Structural health monitoring of carbon nanotube-modified glass fiber-reinforced polymer composites by electrical resistance measurements and digital image correlation

Uribe-Riestra,

Ayuso-Faber,

Rivero-Ayala

et al. 2023

Structural Health Monitoring

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A method based on changes of electrical resistance was used to evaluate non-visible damage inflicted to multiscale hierarchical composites subjected to monotonic and cyclic bending loads. The composites comprise glass fiber weaves modified by carbon nanotubes in a vinyl ester matrix. Damage sensing is achieved by placing an array of electrodes close to the surfaces of four-point bending specimens and is correlated to strain fields measured by digital image correlation (DIC). The top (compressive) surface exhibited lower electrical resistance changes than the bottom (tensile) one. Spatial measurements of electrical resistance allowed identification of the most severely damaged zones, which coincided with those pinpointed by DIC. DIC also indicated an important presence of irreversible interlaminar shear strains accumulating close to the supports and/or loading introduction elements, which coincided with the location of delamination. The electrical technique allowed not only the detection of the onset of damage in the form of initial fiber breakage and matrix cracking, but also the detection of damage progression under cyclic loading and low-velocity impact.

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Section: Resultsmentioning

confidence: 99%

Structural health monitoring of carbon nanotube-modified glass fiber-reinforced polymer composites by electrical resistance measurements and digital image correlation

Uribe-Riestra,

Ayuso-Faber,

Rivero-Ayala

et al. 2023

Structural Health Monitoring

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“…In recent years, glass fiber reinforced polymer (GFRP) composites have been extensively used in many applications such as in electronics, [ 1 ] aerospace industry, [ 2 ] strain sensors, [ 3 ] structural applications, [ 4 ] and marine environment. [ 5 ] GFRP composites are more preferred than other polymer matrix composites due to their supreme mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of graphene oxide and glass fiber‐based hybrid epoxy composites

et al. 2022

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This work aims to develop and characterize graphene oxide (GO) and glass fiber (GF)-based hybrid epoxy composites. Graphite oxide was synthesized by improved Hummers' method, and it was uniformly dispersed in ethanol by ultra-sonication to form GO suspension. Later, GO and GF-based hybrid epoxy composites were prepared by hand layup method followed by curing under compression to develop composite sheets accordingly to the ASTM standards (D3039 & D6110-18). Fourier transform infrared spectra of the neat and the GF-based hybrid epoxy composites confirmed the formation of improved interface between GO/epoxy and silane coating present on GF surface, which is well validated with the given reaction schematic. Scanning electron microscope and elemental mapping results corroborate our point that the GO filled the voids and empty spaces and lessened the water absorption properties of the composite which is much needed for the application of composites at high altitudes and marine environment. Effect of GO content on mechanical properties of prepared composites was studied by varying the GO content from 0.1 to 1.2 wt%. Mechanical characterization of GO and GF-based hybrid epoxy composites were carried out by tensile and impact testing. Ultimate tensile strength,

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“…Park et al [36] investigated the damage diagnosing capability of CNT-doped self-sensing composites during uniaxial tensile tests. Shahbaz et al [37] fabricated GFRP composites including CNT enabled fiber sensors, and detected the real-time flexural strain and damage inside the composites. In short, the aforementioned studies have proven effectiveness of CNTs as conductive fillers for sensing network formation in SHM systems.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation on the mechanical and electrical properties of multiwalled carbon nanotube/waterborne polyurethane coated 3D printing carbon fiber reinforced composites

Liu

et al. 2022

Polymer Composites

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Mechanical-electrical properties and failure behavior of 3D printed carbon fiber reinforced composites with multiwalled carbon nanotube (MWCNT)/ waterborne polyurethane (WPU) conductive coating were studied to develop a performance monitoring method for composites. The results indicated that the coating materials could obtain good mechanical-electrical properties and sensitivity factor. Scanning electron microscopy images show that multiple conductive channels exist in the coating. The coating is well bonded to the composites. In order to obtain more details, mechanical-electrical coupling simulation was conducted. The experiment and simulation are in good agreement. The correlation between the strain of composite part and the electrical resistance change rate of the coating is validated. Furthermore, the multi-scale observations reveal the failure mechanism including composite-coating debonding, brittle fracture of polyamide matrix, fiber breakage, and pull-out in the composite part, as well as ductile fracture of WPU matrix and MWCNT pull-out in the coating part. This study can provide some insights for structural health monitoring of composites.

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Fabrication and analysis of integrated multifunctional MWCNTS sensors in glass fiber reinforced polymer composites

Cited by 18 publications

References 32 publications

Structural health monitoring of carbon nanotube-modified glass fiber-reinforced polymer composites by electrical resistance measurements and digital image correlation

Structural health monitoring of carbon nanotube-modified glass fiber-reinforced polymer composites by electrical resistance measurements and digital image correlation

Fabrication and characterization of graphene oxide and glass fiber‐based hybrid epoxy composites

Experimental and numerical investigation on the mechanical and electrical properties of multiwalled carbon nanotube/waterborne polyurethane coated 3D printing carbon fiber reinforced composites

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