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Material Selection and Production Methods Robert Love, Venkat Jayaraman July 8, 2008 SSTP Seminar – Lecture 5.

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Presentation on theme: "Material Selection and Production Methods Robert Love, Venkat Jayaraman July 8, 2008 SSTP Seminar – Lecture 5."— Presentation transcript:

1 Material Selection and Production Methods Robert Love, Venkat Jayaraman July 8, 2008 SSTP Seminar – Lecture 5

2 Overview Topics: Basic Material, Properties, Production – Polymers – Metals – Ceramics – Composites Material Selection Discussion Activity 12/21/2013UF Flight Controls Lab2

3 Examples: PET, ABS, PVC, PETE Polymer – A large molecule of repeating structural units connected by covalent bonds Wide variety of applications Structural and non structural Mass-manufactured and one off Polymers - Introduction Polypropylene Application areas of polymers

4 Electrical insulation since non-conducting Toughness to resist mechanical abuse such as impact Vibration attenuation Low weight Ease of manufacture Ease of transportation and installation Polymers – Properties and Classification Plastic Fiber Elastomer Classification based on properties

5 Elastomers – Class of polymers which return to their original shape after the applied stress is removed. Vulcanization – Curing process of rubber involving high heat and formation of cross links with sulfur Elastomer

6 Thermoplastics – Soften on heating and harden on cooling – Individual strands – Can be remoulded after heating Thermosets – – Polymers are crosslinked – Cant melt Thermosets are generally harder, more rigid and more brittle, and their mechanical properties are not heat sensitive Plastics

7 Mechanical properties comparison Stress Strain Comparison

8 Polymer Production Common-Injection Molding, Thin Films 12/21/2013UF Flight Controls Lab8

9 Metals Examples: – Steel, Aluminum, Magnesium, Gold, Zinc, Silver, Platinum, Alloys, Superalloys Molecular Structure – Metallic Bonding: Sea of electrons – Crystal Lattice Applications – Electronics, Structures, Jewelry 12/21/2013UF Flight Controls Lab9

10 Properties of Metals Electrical – High conductivity, low resistivity Heat – Excellent conductors, high melting point Structural – Heavy, fairly to very strong, ductile/malleable, may be strengthened by cold work or heat treatment or annealed to reduce strength Corrosion – Some highly reactive, some very non-reactive, some radioactive 12/21/2013UF Flight Controls Lab10

11 Metal Production 12/21/2013UF Flight Controls Lab11

12 Physical Vapor Deposition, Chemical Vapor Deposition, E-Beam Lithography w/Photoresist Metal Production 12/21/2013UF Flight Controls Lab12

13 Ceramics Examples – Silicon Carbide (SiC), Silica (SiO 2 ), TiC, PZT, Fe 3 O 4, ZnOFe Structure – Ionic or Covalent Bonding – Formed by heat addition – Generally metal+nonmetal Applications – High temperature shields, brake pads, pottery, knives, coatings, electronics 12/21/2013UF Flight Controls Lab13

14 Properties of Ceramics Electronic – Insulators (some exceptions:piezoelectrics PZT), Semi-conductors, superconductivity Heat – Low conductivity, high melting point Structural – Heavy, brittle, very strong, low impact resistance (toughness), stiff, high hardness Corrosion – Generally very unreactive, highly scratch resistant 12/21/2013UF Flight Controls Lab14

15 Ceramic Production Particles->Slurry->Casting, Hand/Kiln (Sintering) 12/21/2013UF Flight Controls Lab15

16 Composites Examples – Concrete, Polymer Matrix + Carbon/Glass/Kevlar fiber Structure – Matrix + Reinforcement – Combo of 2 of previous 3 material classifications Applications – Pressure Chambers, Bikes, Aircraft 12/21/2013UF Flight Controls Lab16

17 Properties of Composites IT DEPENDS!!! Electrical – Usually insulators, some intentionally made conductive Heat – Generally heat resistant, depends on matrix Structural – Tailor made strength properties (weight reduction), high stiffness and strength to weight ratio Corrosion – May have issues 12/21/2013UF Flight Controls Lab17

18 Composite Production 12/21/2013UF Flight Controls Lab18 Basic Sequence: – By hand: Layup (wet or prepreg) on mold/tool, Vacuum Bag, Bake, Release – May have automatic-tape/winding machines

19 Material Selection 12/21/2013UF Flight Controls Lab19

20 Activity Think of a need and a product – What material(s) do you need? – What are important properties to consider in the material selection process? – How will you make this product? 12/21/2013UF Flight Controls Lab20

21 Color Approximate Temperature °F°CK Faint Red Blood Red Dark Cherry Medium Cherry Cherry Bright Cherry Salmon Dark Orange Orange Lemon Light Yellow White /21/2013UF Flight Controls Lab21

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