electrical bonding of composite materials
electrical bonding of composite materials
(OP)
What type of bonding is best for components that are fiberglass/epoxy and aluminum to meet the MIL-STD-464 5.11 at 10 milliohms thru 2.5 milliohms?
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electrical bonding of composite materials
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electrical bonding of composite materialselectrical bonding of composite materials(OP)
What type of bonding is best for components that are fiberglass/epoxy and aluminum to meet the MIL-STD-464 5.11 at 10 milliohms thru 2.5 milliohms?
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RE: electrical bonding of composite materials
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RE: electrical bonding of composite materials
B.E.
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RE: electrical bonding of composite materials
Usually the problem with secondary structural composites [like fairings, tips, etc] is precipitation-static ['P-static'] charge build-up. This problem can be mitigated by anti-static coatings that also ground thru attachments fasteners and active static diverters such as trailing-edge static wicks. For components that cannot tolerate conductive coatings [such as antenna radomes, antenna covers, etc], and are subject to lightning strikes [primary lightning zone locations], then discretely placed metal straps [plain or segmented lightning diverter strips] bleed-off P-static and absorb/direct lightning pulses exterior surface of the composite, and lead directly to an aluminum airframe bond-point. These external straps are often sacrificial for aircraft safety [IE; absorb/redirect destructive lightning energy, one-time] and can be readily replaced.
For large area primary composite structure, methods are in-place to mitigate P-static build-up and to absorb/conduct-away lightning strikes. These ‘processes’ use conductive coating mechanisms [such as metallic/metalized coating; or conductive erosion coatings]; or wire-mesh or conductive filaments embedded into the entire outer composite layers, etc… using materials and methods which are highly proprietary. Electrical wire grounding paths [separate of conventional airframe ground/bonding paths] for aircraft systems components are mandatory. Extreme care [design, testing, fabrication, maintenance] is required for composite airframe structures, that also serve as integral fuel tanks, to eliminate all potential for static-arc, electrical-arc, lightning-arc/hot-spot ignition, etc, that could initiate fuel-fed fire/explosion.
Regards, Wil Taylor
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RE: electrical bonding of composite materials