Electromagnetic shielding by advanced composite materials. Final report
Technical Report
·
OSTI ID:6407918
The transmission of electromagnetic waves through planar sheets and cylindrical shells of advanced composite laminates is considered in both the frequency and time domains. Attention is concentrated on the frequency range characteristic of the nuclear electromagnetic pulse. The composite laminates are modeled for the purposes of this study by isotropic dielectric or conducting materials. A new 'boundary connection operator' is developed to describe the connection between the tangential electric and magnetic fields on either side of a general multilayer shield. An equivalent sheet impedance operator is developed to describe the bonded wire-mesh screen which is often incorporated in boron-epoxy composite laminates to improve their shielding effectiveness. These analyses are used to study the transmission of EMP signals through planar composite sheets and into cylindrical composite shells in the frequency and time domains. Both graphite-epoxy and 'screened' boron-epoxy laminates are considered. Numerical results are presented to illustrate the analytical formulas which are derived. It is found that the shielding effect of a screened boron-epoxy composite laminate is essentially that of the screen itself. The laminate only has an effect on the equivalent sheet impedance of the screen for parallel-polarized fields, and this effect is relatively minor over the EMP frequency spectrum.
- Research Organization:
- Kansas State Univ., Manhattan (USA)
- OSTI ID:
- 6407918
- Report Number(s):
- AD-A-058808
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360304* -- Composite Materials-- Physical Properties-- (-1987)
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
657007 -- Electricity & Magnetism-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BORON
COMPOSITE MATERIALS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
ELEMENTS
EPOXIDES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SCREENS
SEMIMETALS
SHIELDING
TRANSMISSION
360304* -- Composite Materials-- Physical Properties-- (-1987)
654001 -- Radiation & Shielding Physics-- Radiation Physics
Shielding Calculations & Experiments
657007 -- Electricity & Magnetism-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BORON
COMPOSITE MATERIALS
ELECTRICAL PROPERTIES
ELECTROMAGNETIC PULSES
ELECTROMAGNETIC RADIATION
ELEMENTS
EPOXIDES
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATIONS
SCREENS
SEMIMETALS
SHIELDING
TRANSMISSION