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SANDWICH COMPOSITES. COMPONENTS OF SANDWICH COMPOSITES face sheets, facings, skins face sheets, facings, skins core material core material adhesive adhesive.

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Presentation on theme: "SANDWICH COMPOSITES. COMPONENTS OF SANDWICH COMPOSITES face sheets, facings, skins face sheets, facings, skins core material core material adhesive adhesive."— Presentation transcript:

1 SANDWICH COMPOSITES

2 COMPONENTS OF SANDWICH COMPOSITES face sheets, facings, skins face sheets, facings, skins core material core material adhesive adhesive

3 FACE SHEETS traditional composite materials traditional composite materials

4 CORE MATERIALS honeycomb (Hexcel, Plascore) honeycomb (Hexcel, Plascore) –method of manufacture expansion process or corrugation process (see mfg processes) expansion process or corrugation process (see mfg processes)see mfg processessee mfg processes determines difference in L/W performance (see data sheet) determines difference in L/W performance (see data sheet)see data sheetsee data sheet –materials (see property comparison) see property comparisonsee property comparison aluminum (CR-PAA/CRIII 5052 and 5056, ACG) aluminum (CR-PAA/CRIII 5052 and 5056, ACG) aramid fiber reinforced phenolic (HRH-10 (Nomex), KOREX) aramid fiber reinforced phenolic (HRH-10 (Nomex), KOREX) glass reinforced phenolic (HRP, HFT) glass reinforced phenolic (HRP, HFT) glass reinforced polyimide (HRH-327) glass reinforced polyimide (HRH-327) thermoplastic thermoplastic closed cell rigid foam closed cell rigid foam –Rohacell (polymethacrylimide), Divinycell (polyvinyl chloride) RohacellDivinycellRohacellDivinycell cast (two-part expanding) foam cast (two-part expanding) foam balsa (Baltek) balsa (Baltek)Baltek

5 ADHESIVE BONDING rely on resin used in face sheet (particularly in wet lay-up) rely on resin used in face sheet (particularly in wet lay-up) film adhesive film adhesive select adhesive according to application select adhesive according to application

6 FABRICATION PROCESS forming forming –machining –for foams curing/annealing to achieve desired density and strength curing/annealing to achieve desired density and strength thermoforming thermoforming cleaning cleaning –vacuuming –for aluminum - vapor degreasing –for Nomex - ethyl alcohol drying (elevated temperature in air-circulating oven) drying (elevated temperature in air-circulating oven) face sheets cocured or post-bonded face sheets cocured or post-bonded must check compaction pressure will not crush core materials or cause intercell buckling of face sheets must check compaction pressure will not crush core materials or cause intercell buckling of face sheets

7 ADDITIONAL CONSIDERATIONS edge closures edge closures edge closures edge closures hardpoints for fasteners hardpoints for fasteners


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