Design and fabrication of a flexible dielectric sensor system for in situ and real-time production monitoring of glass fibre reinforced composites

Yang, Yang; Chiesura, Gabriele; Vervust, Thomas; Bossuyt, Frederick; Luyckx, Geert; Degrieck, Joris; Vanfleteren, Jan

doi:10.1016/j.sna.2016.03.015

Cited by 42 publications

(43 citation statements)

References 26 publications

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“…Another sensor type is the interdigital sensor (IDS), which refers to a digit‐like or finger‐like parallel in‐plane set of electrodes with a periodic pattern . In contrast with a parallel plate sensor, the geometry of the IDS can be far more stable since both electrodes are now in the same plane.…”

Section: Introductionmentioning

confidence: 99%

Design and fabrication of a shielded interdigital sensor for noninvasiveIn situreal-time production monitoring of polymers

Yang

Chiesura

Vervust

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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Interdigital sensors (IDS) have received great attention for production monitoring of polymers over the past decade. However, conventional IDS are limited by high noise to environment due to the dual side access of the sensor, low nominal capacitance, and sensitivity. In this study, a shielded IDS fabricated by flexible circuit board (FCB) technology is presented to overcome these challenges. Compared to conventional sensors, the environmental dependence of the new sensor is minimized by the copper shield. Furthermore, nominal capacitance of at least 350% higher, and an increase of sensitivity per unit area are achieved. To demonstrate the capabilities of the new IDS, a FCB comprising the proposed sensor is fabricated, attached to a mould, and successfully applied for in situ real‐time production monitoring of an epoxy resin. The resulting flexible sensor is noninvasive towards the fabricated parts, and measures the key stages along the production process. © 2016 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2016, 54, 2028–2037

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Section: Introductionmentioning

confidence: 99%

Design and fabrication of a shielded interdigital sensor for noninvasiveIn situreal-time production monitoring of polymers

Yang

Chiesura

Vervust

et al. 2016

J. Polym. Sci. Part B: Polym. Phys.

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“…The structure of the IDS is shown in Figure 7b. Based on our previous studies, [39] the maximal unit area sensitivity of the sensor, within our fabrication limit, is achieved with finger width W = finger spacing g = 0.1 mm. An electromagnetic field is generated between the electrodes near the sensor surface.…”

Section: Demonstration: Giant Seven-segment Displaymentioning

confidence: 98%

“…A matrix of interdigital capacitive sensors (IDS), which combines geometrical stability, and the possibility to be accessed from a single side, [36][37][38] was integrated in the thermoformed composites to function as the 3D touch sensor matrix (with 16 touch sensors). [39] The IDS was designed to be slightly larger than the average size of a fingertip to ensure the sensor's response to touching. Its working principle is based on the fringing electric field effect: when a voltage is applied to the electrodes.…”

Section: Demonstration: Giant Seven-segment Displaymentioning

confidence: 99%

3D Multifunctional Composites Based on Large‐Area Stretchable Circuit with Thermoforming Technology

Yang

Vervust

Dunphy

et al. 2018

Adv Elect Materials

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decade, substantial efforts were devoted to the research and development of the nextgeneration composites. This new class of materials should not only possess higher strength-to-weight ratio than metals but also tailored with integrated intelligence, which is desirable as infrastructures for next generation of "internet of things." Carbon nanomaterials, such as carbon nanotubes and carbon nanofibers, have received dominant attention for the creation of intelligent composites. [3][4][5][6] They were dispersed in a polymer matrix to form conductive percolating networks as distributed sensors in situ to evaluate the strain, stress, damage, and temperature for self-sensing and on-line structural health monitoring applications. [3][4][5][6] However, these composites are restricted to (piezo) resistive effect based sensing capabilities from the included nanomaterials. Nextgeneration composites, however, should not only encompass sensing capabilities but also be equipped with other functionalities such as lighting, computation, and communication elements, as illustrated in Figure 1. One straightforward solution to achieve this goal is to integrate electronic circuits with off-the-shelf components in the composites. However, these functional composites usually have complex, 3D shapes, but conventional electronic circuits are rigid and planar. The shape mismatch between 3D composites and planar, rigid electronic circuits causes difficulties in integrating electronic circuit-based intelligences.Recent advancement of flexible and stretchable circuits has paved the way for integration of electronics in unusual shapes and forms. Through materials and structure innovation, [7] the circuits become stretchable, deformable, and conformable to curvilinear surfaces, [8][9][10] enabling a spectrum of applications such as stretchable sensors and actuators, [11][12][13][14] transparent conductors, [15,16] lighting, [17][18][19] and energy devices. [20][21][22] Various types of stretchable nanomaterials, such as carbon nanomaterials [23][24][25] and metal nanowires [26][27][28] have been synthesized and integrated to elastomeric polymer matrix for stretchable circuits. Despite their superior mechanical properties and potential to achieve transparent stretchable circuits, so far it has been a struggle to deliver high enough conductivities compared to structure engineered stretchable circuits.Fiber-reinforced polymer composites with integrated intelligence, such as sensors, actuators, and communication capabilities, are desirable as infrastructures for the next generation of "internet of things." However, the shape mismatch between the 3D composites and a planar electronic circuit causes difficulties in integrating electronic circuit-based intelligences. Here, an easily scalable approach, by incorporating a large-area stretchable circuit with thermoforming technology, to fabricate 3D multifunctional composites is reported. The stretchable circuit is first fabricated on a rigid and planar carrier board, then transferred and sandwiched bet...

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“…Epoxy composite materials reinforced by glass fibers have high strength‐to‐weight ratios compared to steel and are used in various applications in the aerospace, automotive, and wind energy industries . Compression molding is a manufacturing process in which “prepregs” (reinforcing fabric preimpregnated with a resin system) are compressed in a mold under the action of temperature and pressure .…”

Section: Introductionmentioning

confidence: 99%

A method based on the time–temperature superposition principle to predict pressurization time in compression molding

Zhang

Zhao

Zhang

2018

J of Applied Polymer Sci

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The quality of epoxy composites reinforced by glass fibers and manufactured by compression molding is affected by the pressurization time. Traditional methods, including differential scanning calorimetry and dynamic thermomechanical analysis, cannot be reliably used to predict pressurization time in the scenario of continuous production and inconstant circumstances seen in industry. In this paper, the rheological behaviors of epoxy under constant temperature were investigated and analyzed to verify if the time–temperature superposition (TTS) principle, which defines the relation between time and temperature in the deformation and relaxation response of a viscoelastic material, could be suitably applied to describe them. The results show that the TTS principle could indeed be used to predict resin viscosity by the horizontal shift factor. A new method based on the TTS principle and written into a program to forecast pressurization time in compression molding is proposed. The uniform surface color and the qualified thickness of the composite components using the program indicate that the program works well and that this method is feasible for predicting pressurization time during compression molding. The results of tensile and short‐beam shear strength tests show that pressurization time affects the mechanical properties of the final product. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45308.

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Design and fabrication of a flexible dielectric sensor system for in situ and real-time production monitoring of glass fibre reinforced composites

Cited by 42 publications

References 26 publications

Design and fabrication of a shielded interdigital sensor for noninvasiveIn situreal-time production monitoring of polymers

Design and fabrication of a shielded interdigital sensor for noninvasiveIn situreal-time production monitoring of polymers

3D Multifunctional Composites Based on Large‐Area Stretchable Circuit with Thermoforming Technology

A method based on the time–temperature superposition principle to predict pressurization time in compression molding

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