MecE 260 Final Exam

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Author:
aayai
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250076
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MecE 260 Final Exam
Updated:
2013-12-01 20:28:27
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260
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260 final
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  1. In the stress vs strain chart, what is the difference between ductile and brittle material?
    Ductile material has a plastic region, brittle material does not
  2. In the stress vs strain chart, what is the difference between ductile and really ductile material?
    Really ductile material will see a stress plateau after reaching yield stress, ductile material will not
  3. Describe the tensile failure of brittle vs ductile material.
    Brittle material will have a relatively smooth fracture surface, ductile material will have a rough fracture surface (or cup and core)
  4. Describe the torsional failure of brittle vs ductile material.
    • Brittle material will just snap diagonally, no plastic deformation
    • Ductile material will show torsional lines
  5. What are the steps in sand casting?
    • 1. Pattern making
    • 2. Molding
    • 3. Melting and pouring
    • 4. Cleaning
  6. What are the steps in investment casting?
    • 1. Pour wax over the material you want to produce.
    • 2. Slurry is sprayed over wax pattern. 
    • 3. Take out wax
    • 4. Now you have a mold
  7. What are the steps in permanent mold casting?
    Just like sand casting, but with a steel mold.
  8. What is die casting?
    Using a steel mold, melted metal is pushed into the mold at high pressures.
  9. What is powdered metallurgy?
    A fine powder is mixed with binders and additives.  It has a high accuracy since it reduces thermal shrinking.
  10. What is plastic injection molding?
    • 1. Pellets are transported by screw into melting zone
    • 2. RAM injects material into mold
  11. What is the polymer extrusion process?
    Like plastic injection molding, but instead of a mold it just goes through

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