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530.352 Materials Selection

530.352 Materials Selection. Lecture #9: Structure and elastic properties of CMC’s Tuesday September 27 th , 2005. Composites. Matrix + Metal (MMC) Al (most widely used) and Ti Ceramic (CMC) Polymeric (PMC) Thermoset

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530.352 Materials Selection

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  1. 530.352 Materials Selection Lecture #9: Structure and elastic properties of CMC’sTuesday September 27th, 2005

  2. Composites

  3. Matrix + Metal (MMC) Al (most widely used) and Ti Ceramic (CMC) Polymeric (PMC) Thermoset Epoxy (most widely used), polyimides (max T stability), cyanate esters, etc. Thermoplastic Poly Ether Ether Keytone (PEEK) – can be remolded Reinforcement Particulate (in MMC) Whiskers (chopped fibers) Continuous fiber Fiberglass (cheap, most common) Kevlar Graphite Carbon Poly Acrylic Nitrile (PAN) Boron SiC Composites are:

  4. Matrix Types

  5. Polymer Resin Comparison From “PrePreg Technology”, Hexcel Composites

  6. Polymer Matrix Types

  7. Polymer Matrix Types

  8. Other Matrix Types

  9. Reinforcement Forms

  10. Fiber Materials

  11. Fiber Materials

  12. Graphite Fiber Production

  13. Boron b-SiC Reaction Zone Reaction Zone W Filament C Monofilament SiC Non-Stoichiometric SiC Fiber Materials

  14. SiC Fiber Carbon Core Coating SiC

  15. 800 700 600 500 400 300 200 100 0 10 20 30 40 50 60 70 80 Fiber Comparison Carbon Boron UHS SiC HS PAN IM HM UHM Tensile Strength (ksi) Aramid Glass Carbon MesoPitch Carbon Pitch Tensile Modulus (Msi) From “Composite Materials: Science and Engineering”, K.K.Chawla

  16. Composite forms: • Prepreg Tape • Fibers are ‘pre-impregnated’ into matrix which is partially cured but tacky • All fibers aligned in single direction • Tape ~ 12” wide and any length • Prepreg Cloth • Fibers woven to provide strength/stiffness in 2 directions • Woven cloth “pre-impregnated” w partially cured resin • Cloth ~ 36” wide • Different weaves give different drape • Preform • Fibers stitched, woven, or braded into complicated 3D shapes

  17. What is a Prepreg? From “PrePreg Technology”, Hexcel Composites

  18. Weave Styles

  19. 3D Woven / Braided Forms

  20. Composite Fabrication: Batch acceptance Lay up Bagging Assembly Inspect Cure

  21. Voight Model  Iso-strain A = B =  Av.  = VA A + VBB Av. E = Av. /  = VAA /  + VBB /  Ecomposite = VA EA + VB EB A B

  22. Reuss Model  Iso-stress A = B =  Av.  = VA A + VBB Av.  = VA A + VB B 1 / Ecomposite = VA / EA + VB / EB A B

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