Processes
In this AM process, material is pushed through a shaped hole which imparts shape for the material. (ASTM Terminology)
Material extrusion
In this AM process, 3D objects are produced by hardening a liquid polymer using light energy into the desired shape. (ASTM terminology)
Vat photopolymerization
Molecules that absorb photons upon irradiation with light and form reactive species which initiate consecutive reactions - a component in resin used for vat photopolymerization.
Photoinitiators
In material extrusion, if one wishes to increase the deposition rate by using larger filaments, what must one do to the length of the heating element?
Increase
Three common light sources for vat photopolymerization.
Laser, digital light projection, LED array
In this AM process, 3D objects are produced by melting materials as they are being deposited.
Directed energy deposition
In this AM process, 3D objects are produced by fusion of pre-deposited particles using a thermal source.
Powder bed fusion
Thermoplastic
What is the strongest driver for sintering, and what is the strongest particle driver for sintering?
Temperature, particle size
Types of powder dispensing (two) and spreading (two) mechanisms.
Hopper and piston, blade and roller
In this AM process, 3D objects are produced by printing a binder onto a powder for object consolidation. (ASTM terminology)
Binder jetting
The name of the technique developed by Wilhelme which serves as a historical precursor to vat photopolymerization.
Photosculpture
Rank the following AM processes by size of powder particles used (from smallest to largest): powder bed fusion, binder jetting, directed energy deposition
This distribution is used to estimate laser intensity distributions for vat photopolymerization and powder bed fusion.
Gaussian
Energy sources for powder bed fusion and directed energy deposition.
Laser, electron beam, infrared, arc
In this AM process, 3D objects are produced by consolidation of material dispensed from a printhead.
Material jetting
In this AM process, 3D objects are produced by cutting, stacking, and bonding sheets of material.
Laminated object manufacturing
Due to brittle nature, these materials commonly require two-step processing for AM, that is the separation of shaping and densification.
Ceramics
What are the three classes of functional gradients that can be attained via AM?
Microstructure, porosity, composition
Two common types of inkjet printing methods.
Piezoelectric and thermal
Name 5 common names for powder bed fusion processes
Laser powder bed fusion, selective laser sintering, selective laser melting, direct metal laser sintering, electron beam powder bed fusion, electron beam melting, high speed sintering, multi-jet fusion