Material Property-Estimate Technique Based on Natural Frequency for Updating Finite Element Model of Orthotropic Beams

et al. 2022

Sci Rep

The potential use of gelatin materials in the liquid composite molding manufacturing (LCM) process was investigated, with specific focus on the reinforcement deformation phenomenon. The adoptability of gelatin as a binder in a composite material with glass fiber for application in the LCM process was evaluated by analyzing the permeability and microscopic structure of the gelatin-coated glass fiber. To assess the tow deformation, the permeability of the non-crimped unidirectional glass fiber mat was evaluated at different flow rates that could be applied in the LCM process. Hysteresis of the permeability was observed as the flow rate increased and decreased, indicative of tow deformation. The permeability of the gelatin-treated glass fiber mat exhibited a relatively smaller variation than that of the untreated glass fiber at the same flow rate. Tow deformation in the untreated and gelatin-treated non-crimped glass fiber mats at different flow rates was evaluated by microscopic analysis and quantified using the tow thickness index. Relatively smaller variations in the permeability and minimal changes in the tow thickness of the gelatin-treated glass fiber mat were observed via microscopic analysis, indicating that gelatin effectively maintained the binding structure of the glass fiber mat.

Section: Effect Of Gelatin Treatment On Tow Deformation In Resin-impr...mentioning

confidence: 99%

Effect of gelatin treatment on tow deformation in resin-impregnated glass fiber

et al. 2022

Sci Rep

“…With concept of structural energy storage systems using CFRP, electrical energy storage (EES) devices can be load-bearing structures so that the overall weight of the system can be reduced. 8,9 EES systems are divided into batteries and capacitors. Even though batteries have high energy density, their power density is low because of relatively slow redox kinetics.…”

Section: Introductionmentioning

confidence: 99%

“…Carbon ber-reinforced plastic (CFRP) has been used for structural materials because of their outstanding properties [5][6][7], because they have advantages such as light weight, high speci c strength and stiffness, and high corrosion resistance. With concept of structural energy storage systems using CFRP, electrical energy storage (EES) devices can be load-bearing structures so that the overall weight of the system can be reduced [8,9]. Electrical energy storage systems are divided into batteries and capacitors.…”

Section: Introductionmentioning

confidence: 99%

Structural energy storage system using electrospun carbon nanofibers with carbon nanotubes

Lee,

Jung,

Lee

et al. 2023

Polymer Composites

In the present study, carbon nanofibers containing multi‐walled carbon nanotubes (MWCNTs) were fabricated and employed as electrodes for structural supercapacitors. Carbon nanofibers were utilized as the electrode material in structural supercapacitors to increase the specific surface area. Electrospun polyacrylonitrile (PAN) nanofibers underwent conversion to carbon nanofibers through stabilization and carbonization processes aided by thermal treatment. The specific surface area of the electrospun carbon nanofiber electrodes was further increased approximately 118 times (1946.9 m2/g) using an activation process in comparison with that of non‐activated carbon nanofibers (16.43 m2/g). Multifunctional supercapacitors were fabricated by employing electrospun carbon nanofibers and a vacuum resin infusion technique. The specific capacitance of activated carbon nanofibers (ACNF) and ACNF‐MWCNT exhibited significant improvement (14.87 and 48.25 mF/cm2, respectively) compared to non‐activated carbon nanofibers (CNF‐MWCNT: 1.71 mF/cm2). This improvement was attributed to the reduction in equivalent series resistance and the increase of the surface area of the nanofiber electrodes. Additionally, the carbon nanofiber electrodes contributed to an increased interlaminar fracture toughness of structural supercapacitors, acting akin to “Velcro” between fabric interfaces. This work serves as a “proof of concept” for a straightforward and efficient method to manufacture electrodes for structural supercapacitors based on the electrospinning technique.Highlights Fabrication of carbon nanofibers containing MWCNTs using electrospinning. The carbon nanofiber as an electrode for structural supercapacitors. Simple and effective method. Dramatically improving specific capacitance of the supercapacitors.

Structural Energy Storage System Using Electrospun Carbon Nanofibers with Carbon Nanotubes

Jung

et al. 2023

Preprint

In the present study, carbon nanofibers containing multi-walled carbon nanotubes (MWCNTs) were fabricated using electrospinning and used as an electrode for structural supercapacitors. Electrospun polyacrylonitrile (PAN) nanofibers were converted to carbon nanofibers with stabilization and carbonization processes assisted by thermal treatment. The surface area of the electrospun carbon nanofiber electrodes was further increased several thousand times using an activation process. Multifunctional supercapacitors were fabricated using electrospun carbon nanofibers and a vacuum resin infusion technique. The specific capacitance was dramatically improved due to the decreased equivalent series resistance and increased surface area of the nanofiber electrodes. Moreover, the carbon nanofiber electrodes helped increase interlaminar fracture toughness of structural supercapacitors because it acted like ‘Velcro’ between the fabric interfaces. This work is a ‘proof-of-concept’ for a simple and effective method to produce an electrode for structural supercapacitors based on the electrospinning technique.