scholarly journals Mechanical and Electrical Properties of Glass and Carbon Fiber-Reinforced Composites

1991 ◽  
Vol 113 (3) ◽  
pp. 176-181 ◽  
Author(s):  
G. R. Headifen ◽  
E. P. Fahrenthold
Keyword(s):  
Electrical Properties ◽  
Volume Fraction ◽  
High Energy ◽  
Composite Fiber ◽  
Pulsed Power ◽  
High Energy Density ◽  
Fiber Reinforced ◽  
Dynamics Modeling ◽  
Mechanical And Electrical Properties ◽  
Strength And Stiffness

The design of composite rotors for high-energy density pulsed power supplies demands accurate characterization of both the mechanical and electrical properties of fiber-reinforced epoxy. The mechanical properties of S-2 glass-epoxy, IM6 graphite-epoxy, and hybrid graphite-glass epoxy composites were measured in tension and torsion tests, providing strength and stiffness parameters for rotor dynamics modeling. Variable frequency electrical resistivity tests were conducted to allow estimation of eddy current losses arising in carbon-reinforced materials. Volume fraction measurements using electron microscopy and analysis by digestion allow for normalization of the test results with respect to composite fiber content. The experimental results were used to evaluate the micromechanical rule of mixtures and Halpin-Tsai correlations.

Collective optical Thomson scattering in pulsed-power driven high energy density physics experiments (invited)

2021 ◽  
Vol 92 (3) ◽  
pp. 033542
Author(s):  
L. G. Suttle ◽  
J. D. Hare ◽  
J. W. D. Halliday ◽  
S. Merlini ◽  
D. R. Russell ◽  
...  
Keyword(s):  
Energy Density ◽  
Thomson Scattering ◽  
High Energy ◽  
Pulsed Power ◽  
High Energy Density ◽  
High Energy Density Physics ◽  
Physics Experiments

scholarly journals A Primer on Pulsed Power and Linear Transformer Drivers for High Energy Density Physics Applications

2018 ◽  
Vol 46 (11) ◽  
pp. 3928-3967 ◽  
Author(s):  
R. D. McBride ◽  
W. A. Stygar ◽  
M. E. Cuneo ◽  
D. B. Sinars ◽  
M. G. Mazarakis ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
Pulsed Power ◽  
High Energy Density ◽  
High Energy Density Physics

scholarly journals Improved dielectric constant and energy density of P(VDF-HFP) composites using NBT-xST (x=0, 0.10, 0.26) whiskers

2018 ◽  
Vol 08 (06) ◽  
pp. 1850040 ◽  
Author(s):  
Xuefan Zhou ◽  
Lu Wang ◽  
Guoliang Xue ◽  
Kechao Zhou ◽  
Hang Luo ◽  
...  
Keyword(s):  
Energy Efficiency ◽  
Dielectric Constant ◽  
Energy Storage ◽  
Energy Density ◽  
Electric Field ◽  
High Performance ◽  
Volume Fraction ◽  
High Energy ◽  
High Energy Density ◽  
Surface Modified

The high-performance energy-storage dielectric capacitors are increasingly important due to their wide applications in high power electronics. Here, we fabricated a novel P(VDF-HFP)-based capacitor with surface-modified NBT-[Formula: see text]ST ([Formula: see text], 0.10, 0.26) whiskers, denoted as Dop@NBT-[Formula: see text]ST/P(VDF-HFP). The influences of ST content, fillers’ volume fraction and electric field on the dielectric properties and energy-storage performance of the composites were investigated systematically. The results show that the dielectric constant monotonously increased with the increase of ST content and fillers’ volume fraction. The composite containing 10.0 vol% NBT-0.26ST whiskers possessed a dielectric constant of 39 at 1[Formula: see text]kHz, which was 5.6 times higher than that of pure P(VDF-HFP). It was noticed that the D-E loops of the composites became thinner and thinner with the increase of ST content. Due to the reduced remnant polarization, the composite with 5.0 vol% NBT-0.26ST whiskers achieved a high energy density of 6.18[Formula: see text]J/cm3 and energy efficiency of approximately 57% at a relatively low electric field of 200[Formula: see text]kV/mm. This work indicated that NBT-0.26ST whisker is a kind of potential ceramic filler in fabricating the dielectric capacitor with high discharged energy density and energy efficiency.

Design of Pressure Vessel Cascades for Electromagnetic Launchers

1989 ◽  
Vol 111 (3) ◽  
pp. 326-331
Author(s):  
E. P. Fahrenthold
Keyword(s):  
High Energy ◽  
Pressure Vessels ◽  
Pulsed Power ◽  
Power Supplies ◽  
High Energy Density ◽  
Electromagnetic Launchers ◽  
Electromagnetic Launcher ◽  
Very High Energy ◽  
Very High

The relatively recent development of very high-energy density pulsed power supplies has motivated a renewed interest in the structural design of electromagnetic launchers. Cascade design electromagnetic launcher pressure vessels offer convenient maintenance access to high wear rate components of the structure while satisfying an unusual combination of electromagnetic, strength, and preloading constraints imposed on the system designer. Analysis for design of such structures focuses on the accurate characterization of fluid-structure interaction under dynamic asymmetric loading.

scholarly journals Significantly Enhanced Energy Storage Density by Modulating the Aspect Ratio of BaTiO3 Nanofibers

2017 ◽  
Vol 7 (1) ◽  
Author(s):  
Dou Zhang ◽  
Xuefan Zhou ◽  
James Roscow ◽  
Kechao Zhou ◽  
Lu Wang ◽  
...  
Keyword(s):  
Energy Storage ◽  
Energy Density ◽  
Aspect Ratio ◽  
Volume Fraction ◽  
Breakdown Strength ◽  
Electric Displacement ◽  
High Energy ◽  
High Energy Density ◽  
Energy Storage Density ◽  
Storage Density

Abstract There is a growing need for high energy density capacitors in modern electric power supplies. The creation of nanocomposite systems based on one-dimensional nanofibers has shown great potential in achieving a high energy density since they can optimize the energy density by exploiting both the high permittivity of ceramic fillers and the high breakdown strength of the polymer matrix. In this paper, BaTiO3 nanofibers (NFs) with different aspect ratio were synthesized by a two-step hydrothermal method and the permittivity and energy storage of the P(VDF-HFP) nanocomposites were investigated. It is found that as the BaTiO3 NF aspect ratio and volume fraction increased the permittivity and maximum electric displacement of the nanocomposites increased, while the breakdown strength decreased. The nanocomposites with the highest aspect ratio BaTiO3 NFs exhibited the highest energy storage density at the same electric field. However, the nanocomposites with the lowest aspect ratio BaTiO3 NFs achieved the maximal energy storage density of 15.48 J/cm3 due to its higher breakdown strength. This contribution provides a potential route to prepare and tailor the properties of high energy density capacitor nanocomposites.

Calculation of Electrodynamic Forces of Metallized Capacitor’s Leading Wire

2011 ◽  
Vol 48-49 ◽  
pp. 284-287
Author(s):  
Zhong Hua Kong ◽  
Ya Dong Jiang
Keyword(s):  
Transient State ◽  
High Energy ◽  
Pulsed Power ◽  
High Energy Density ◽  
Power Equipment ◽  
Electrodynamic Force ◽  
Pulsed Power Technology ◽  
Force Increase ◽  
Electrodynamic Forces ◽  
Rising Time

With the development of pulsed power technology, pulsed power equipment requires metallized capacitor with high energy density and large discharging current. Large discharging current makes leading wire pulling form the capacitor, or breaking the leading wire. This paper aims to calculate the electodynamic forces of metallized capacitor’s leading wire under DC, AC and transient state through ANSYS. The results show that electrodynamic force is smaller with annular leading wire, electrodynamic force increase with the frequency increasing under transient current, electrodynamic force increase with the rising time decreasing.

The Atlas project-a new pulsed power facility for high energy density physics experiments

1997 ◽  
Vol 25 (2) ◽  
pp. 205-211 ◽  
Author(s):  
W.M. Parsons ◽  
E.O. Ballard ◽  
R.R. Bartsch ◽  
J.F. Benage ◽  
G.A. Bennett ◽  
...  
Keyword(s):  
Energy Density ◽  
High Energy ◽  
Pulsed Power ◽  
High Energy Density ◽  
High Energy Density Physics ◽  
Power Facility ◽  
Physics Experiments

Fiber-Matrix Interfacial Area Reduction in Fiber Reinforced Cements and Concretes at Moderate to High Fiber Volume Fractions

1994 ◽  
Vol 370 ◽  
Author(s):  
Gebran N. Karam
Keyword(s):  
Mechanical Properties ◽  
Volume Fraction ◽  
Interfacial Area ◽  
Composite Fiber ◽  
Short Fiber ◽  
Published Data ◽  
Fiber Reinforced ◽  
Fiber Volume ◽  
High Fiber ◽  
Fiber Matrix

AbstractThe area and properties of the fiber-matrix interface in fiber reinforced cements and concretes determines the amount of stress transferred forth and back between the cement paste and the reinforcement and hence controls the mechanical properties of the composite. Fiber-fiber interaction and overlap of fibers with fibers, voids and aggregates can dramatically decrease the efficiency of the reinforcement by reducing this interfacial area. A simple model to account for this reduction is proposed and ways to integrate it in the models describing the mechanical properties of short fiber reinforced concretes are presented. The parameters of the model are evaluated from previously published data sets and its predictions are found to compare well with experimental observations; for example, it is able to predict the non-linear variation of bending and tensile strength with increasing fiber volume fraction as well as the existence of an optimal fiber content.

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