Random Lattice Electrical Conductivity Calculations for a Graphite/Epoxy Ply of Finite Thickness

Li, Peter; Strieder, William; Joy, Thomas

doi:10.1177/002199838201600104

Cited by 14 publications

(3 citation statements)

References 16 publications

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“…Because carbon fibers are electrically conducting while the polymer matrix is not, studying the electrical properties of the composites provides a means of investigating the structures [1][2][3][4][5] and monitoring the damage [6][7][8][9] of the composites.…”

Section: Introductionmentioning

confidence: 99%

Carbon fiber polymer-matrix structural composite as a semiconductor and concept of optoelectronic and electronic devices made from it

Chung

Wang

1999

Smart Mater. Struct.

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An epoxy-matrix composite with continuous crossply carbon fibers was found to be a semiconductor in the through-thickness direction, with a tunable energy gap of - eV (infrared). The higher the pressure during composite fabrication by lamination, the higher the interlaminar stress and the greater the energy gap, which is the activation energy for electron jumping from one lamina to the adjacent one in the composite. The semiconducting behavior involves the contact electrical resistivity between adjacent laminae in the composite decreasing reversibly with increasing temperature. The concept of optoelectronic and electronic devices made from carbon fiber polymer-matrix composites is provided. Devices include solar cells, light emitting diodes, lasers, infrared detectors and transistors. Thus, a new dimension is added to smart structures and a new field of electronics (`structural electronics') is born.

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Section: Introductionmentioning

confidence: 99%

Carbon fiber polymer-matrix structural composite as a semiconductor and concept of optoelectronic and electronic devices made from it

Chung

Wang

1999

Smart Mater. Struct.

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“…For current flow along the carbon fibers, the resistance can be assumed to be in inverse proportion to the number of conducting fibers (volume fraction). For conduction in the off-axis direction as a result of contact between neighboring fibers, carbon fibers not being perfectly aligned in the composite, percolation effects can be assumed to be the main process [15,16]. The percolation limit for the attainment of high conductivity is found to be much higher for continuous fiber reinforced composites (about 40 wt%), compared to SFC filled systems and depending on the sequence stacking.…”

Section: Introductionmentioning

confidence: 99%

Strain sensing capabilities of iron/epoxy composites

Christopoulos¹,

Hristoforou²,

Tsamasphyros³

2012

Smart Mater. Struct.

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Particulate composite materials are very common in industrial applications due to the fact that particulate fillers can provide improved materials, as compared with the unfilled matrix. They can also be synergistic with fiber reinforcement to further improve the system performance. On the other hand, a new approach in structural health monitoring is to exploit the intrinsic properties of the material, such as electrical conductivity, optical properties etc, as sensing parameters. In this paper we present results concerning the strain sensing capabilities of iron/epoxy particulate composites at different percentages varying from 30% to 60% by weight. In particular, we investigate the strain induced alteration of the magnetic resistance (reluctance) of such polymers. The magnetic properties of the iron/epoxy composites have been investigated using a vibrating sample magnetometer at room temperature. For the strain–reluctance measurements, a non-contact sensing probe has been employed. The strain–reluctance relation is found to be linear and strongly dependent on the concentration of iron particles.

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“…the polymer resin) during composite fabrication, fiber-fiber contacts always exist, as indicated by the fact that the electrical resistivity of a unidirectional carbon fiber epoxy-matrix composite in the transverse direction (in the plane of the laminae) is not infinite. Several microstructural models have been proposed to explain the electrical conductivity of a lamina in the transverse direction [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

An electromechanical study of the transverse behavior of carbon fiber polymer-matrix composite

Wang

Chung

1997

Composite Interfaces

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The transverse behavior of continuous carbon fiber epoxy-matrix composite was studied by measuring the 0° electrical resistance of a [90]32 composite during 0° tension and compression. The number of fiber-fiber contacts was found to decrease by 0.7% upon tension to 0.5% strain (resistance increasing) and increase by 1.1% upon compression to -0.5% strain (resistance decreasing), such that this number decreased with increasing strain and the resistance varied linearly with strain (fractional resistance change per unit strain = 2), until damage (probably matrix cracking) occurred and caused the resistance to increase with compressive strain beyond 1% (84 MPa stress) and increase abruptly with tensile strain beyond 0.5% (43 MPa stress). Prior to damage, the resistance varied with strain reversibly; slight reversibility was due to plastic deformation of the matrix.

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Random Lattice Electrical Conductivity Calculations for a Graphite/Epoxy Ply of Finite Thickness

Cited by 14 publications

References 16 publications

Carbon fiber polymer-matrix structural composite as a semiconductor and concept of optoelectronic and electronic devices made from it

Carbon fiber polymer-matrix structural composite as a semiconductor and concept of optoelectronic and electronic devices made from it

Strain sensing capabilities of iron/epoxy composites

An electromechanical study of the transverse behavior of carbon fiber polymer-matrix composite

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