question archive Fused filament fabrication (FFF) or fused deposition modeling (FDM) is a 3-D printing approach where a spool of filament is melted as it passes through a nozzle to print plastic parts layer by layer
Fused filament fabrication (FFF) or fused deposition modeling (FDM) is a 3-D printing approach where a spool of filament is melted as it passes through a nozzle to print plastic parts layer by layer
Subject:Mechanical EngineeringPrice: Bought3
Fused filament fabrication (FFF) or fused deposition modeling (FDM) is
a 3-D printing approach where a spool of filament is melted as it passes through a nozzle to print plastic parts layer by layer. The plastic parts are built by depositing them a print plate.
Note: It is the type of 3-D printing that is used in ENES 100 when it is taught in person.
i. (5 points) If you had to choose a type of polymer to use as the filament, would you choose a thermoplastic, a thermoset or a rubber? Using bullet points explain your choice.
ii. (9 points) If you needed to choose a polymer to do FFF/FDM, how would you rank the following properties in terms of how important they would be to the FFF/FDM process and the subsequent use of what you printed. Using bullets briefly explain what each property is and why the propertyit is where it is in your ranking. List the most important property first.
Density????Elastic modulus???
Coefficient of thermal expansion?Melting Temperature and Glass Transition Temperature
b) (10 points) Briefly explain the differences between LDPE, HDPE and UHMWPE based on their structure (molecular structure, packing, crystallinity, chain length, etc.).
c) (10 points) Calculate the number of chains in a 5 m long PVC pipe with an inner diameter 5 cm and a thickness of 0.5 cm if the degree of polymerization is 1000. Assume that the chains are equal in length. The density of PVC is 1.4 g/cm3. The repeat unit of PVC is shown in Table 4.3.
