Compression Molding: SMC and TMC
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Questions and Answers

What type of material system is utilized in the injection molding process?

  • Molding compounds in pellet form (correct)
  • Prepreg systems
  • Wet resin systems
  • Continuous fibers

What is a common application of prepreg systems?

  • Aerospace components
  • Golf club shafts (correct)
  • Building construction
  • Automotive parts

What is a type of molding compound?

  • Thermoplastic resin
  • Sheet Molding Compound (correct)
  • Bulk Molding Compound
  • Thermoset resin

What manufacturing process is often used with molding compounds?

<p>Compression molding (A)</p> Signup and view all the answers

What is a characteristic of molding compounds used in injection molding?

<p>They are in a pellet form (B)</p> Signup and view all the answers

What is a common application of composite materials?

<p>Golf club shafts (C)</p> Signup and view all the answers

What is the typical range of process cycle time for compression molding?

<p>1 to 4 min (D)</p> Signup and view all the answers

What is a characteristic of Thick Molding Compound (TMC) fibers?

<p>Random distribution in three dimensions (C)</p> Signup and view all the answers

What is the primary advantage of using Thick Molding Compound (TMC) over Sheet Molding Compound (SMC)?

<p>Elimination of multiple SMC plies (C)</p> Signup and view all the answers

What is the typical fiber volume fraction in Bulk Molding Compound (BMC) or Dough Molding Compound (DMC)?

<p>15 to 20% (C)</p> Signup and view all the answers

Which type of reinforcement can be used in injection moldable compounds?

<p>Glass, carbon, and aramid fibers (C)</p> Signup and view all the answers

What is a characteristic of Bulk Molding Compound (BMC) or Dough Molding Compound (DMC) composites?

<p>Lower mechanical properties than SMC composites (B)</p> Signup and view all the answers

What is a major disadvantage of prepreg materials?

<p>Higher cost (D)</p> Signup and view all the answers

What is the primary resin used in Sheet Molding Compound (SMC)?

<p>Polyester or vinylester (C)</p> Signup and view all the answers

What is the maximum thickness of Sheet Molding Compound (SMC)?

<p>6 mm (B)</p> Signup and view all the answers

What is the purpose of applying a prepreg to the surface of an aerospace composite?

<p>To improve its properties (C)</p> Signup and view all the answers

What is the process used to mold SMC?

<p>Compression molding (B)</p> Signup and view all the answers

What percentage of short glass fibers is typically contained in SMC?

<p>30% by weight (B)</p> Signup and view all the answers

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