The 3D printing approach shown below is fused deposition modelling (FDM), where feedstock polymer is fed into the heated printer nozzle and deposited onto the platform to form the final object in the desired geometry. Which of the polymers below are suitable for this process and what nozzle temperature should be used for that material? Z AXIS X AXIS TONE Y AXIS E: Filament LEGEND: A: Extruder B: Nozzle C: Printed part D: Hot plate Select one or more: a. Polyvinyl chloride - 110°C (for PVC: Tg = 120°C, Tmelt = 240°C, HDT = 92 °C) b. ABS-125°C (for ABS: Tg = 140°C, Tmelt = 200°C, HDT = 100 °C) c. Polyvinyl chloride - 250°C (for PVC: Tg = 120°C, Tmelt = 240°C, HDT = 92 °C) d. ABS-215°C (for ABS: Tg = 140°C, Tmelt = 200°C, HDT = 100 °C)

The 3D printing approach shown below is fused deposition modelling (FDM), where feedstock polymer is fed into the heated printer nozzle and deposited onto the platform to form the final object in the desired geometry. Which of the polymers below are suitable for this process and what nozzle temperature should be used for that material? Z AXIS X AXIS TONE Y AXIS E: Filament LEGEND: A: Extruder B: Nozzle C: Printed part D: Hot plate Select one or more: a. Polyvinyl chloride - 110°C (for PVC: Tg = 120°C, Tmelt = 240°C, HDT = 92 °C) b. ABS-125°C (for ABS: Tg = 140°C, Tmelt = 200°C, HDT = 100 °C) c. Polyvinyl chloride - 250°C (for PVC: Tg = 120°C, Tmelt = 240°C, HDT = 92 °C) d. ABS-215°C (for ABS: Tg = 140°C, Tmelt = 200°C, HDT = 100 °C)

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Question: What are the main factors influencing the glass transition temperature (Tg) of a tough polymer, and how do they affect the mechanical properties?
Sintering is the process whereby green compacts are heated in a controlled atmosphere furnace to a temperature a. in the room temperature b. over the melting point C. over the recrystallization point d. below the melting point e. below the recrystallization point
2. Plot the effect of glass temperature on phase transition (Vitrification) in amorphous polymers.
In the context of 3D printing, elaborate on the differences between Fused Deposition Modeling (FDM) and Stereolithography (SLA) printing processes. How do they work, and what are their applications?
1. The rocker or roller support is commonly used for supporting one end for trusses to allows freedom for expansion or contraction of the members due to a change in temperature or application of loads. 2. Many of the polymer based composites are subject to attack by chemicals or solvents, just as the polymers themselves are susceptible to attack and absorb moisture. 3. If the biological material is produced from toxic substances, it is not compatible with the tissues of the body and may lead to side reactions. 4. Advanced nanomaterials are characterized by their small size and high performance. 5. Without support reactions, the body can move in any direction or wrap around itself. advantages disadvantages. O O O O O O O O
The involved elements lose their individual identities due to micro mixing is known as composites. Select one: O True X False
In the context of 3D printing, what is Fused Deposition Modeling (FDM), and how does it differ from Stereolithography (SLA)?
more than one option is possible a-The window allows for oxygen molecules to flow into the resin vat from underneath in order to react with the monomer molecules and increase the polymerization and ultimately print speed b- The oxygen abundance in the proximity of the window quenches the activated molecules hence stopping any polymerization from occurring at the direct proximity of the window c-The dead zone is an unintended outcome of the oxygen permeable window that provides a nonstick surface at the cost of slowing down the print process d-The presence of oxygen in the resin environment slows down the polymerization reaction
Why does shrinkage occur in 3D FDM printing? Explain 2 approaches to reduce shrinkage for a given component geometry