EFFECT OF REPAIR ON THE ELECTROMAGNETIC SHIELDING PROPERTIES OF COMPOSITE MATERIALS

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Authors
  1. Gardner, C.L.
  2. Apps, R.
  3. Russell, A.J.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
Abstract
Composite materials are increasingly being used for the construction of aircraft because of their superior physical properties. Maintenance of adequate electromagnetic (EM) shielding inside the aircraft is often a concern because of the increasing use of sensitive avionics. Degradation of EM shielding provided by the skin of the aircraft during repair can be of particular concern. In the report, we present results of measurements that we have made to examine the effect of repair on the magnetic and electric shielding properties of carbon/epoxy laminates. In carrying out this study, we have used the conventional repair techniques that are used for repair of the CF-18 aircraft. These methods include the application of epoxy bonded carbon/epoxy and titanium patches, and the use of a bolted aluminum rapid repair (battle) patch. In all cases the patches were applied over a 75 mm hole in a 8-ply AS-4 carbon/epoxy laminate. The results show that the use of a carbon/epoxy or a titanium patch results in a degradation of the magnetic shielding of the carbon/epoxy laminates by as much as 40 dB. This large degradation is attributed to the loss of electrical contact between the patch material and the laminate. The Otgradation of magnetic shielding with a bolted aluminum patch is less severe (difference 20 dB) because the bolts provide some electrical contact between the patch and the laminate. TRUNCATED
Keywords
HPM (High Power Microwaves);Electromagnetic susceptibility
Report Number
DREO-TN-97-001 — Technical Note
Date of publication
01 Jan 1997
Number of Pages
20
DSTKIM No
97-02703
CANDIS No
502967
Format(s):
Hardcopy;Document Image stored on Optical Disk

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