Nonisotropic experimental characterization of the relaxation modulus for PolyJet manufactured parts

Mechanical properties of parts constructed with additive manufacturing (AM) technologies are highly influenced by raw material and process characteristics. It is widely assumed that a certain degree of anisotropy should be expected in AM parts due to their layer-upon-layer nature. Present work focus...

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Bibliographic Details
Published in:Journal of materials research 2014-09, Vol.29 (17), p.1876-1882
Main Authors: Blanco, David, Fernandez, Pelayo, Noriega, Alvaro
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Comparative analysis
Construction materials
Curing
Design of experiments
Geometry
Inorganic Chemistry
Manufacturing
Materials Engineering
Materials research
Materials Science
Mechanical properties
Nanotechnology
Orientation
Photopolymers
Polymer
Rapid prototyping
Raw materials
Temperature
Vertical orientation
Viscoelasticity
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Summary:Mechanical properties of parts constructed with additive manufacturing (AM) technologies are highly influenced by raw material and process characteristics. It is widely assumed that a certain degree of anisotropy should be expected in AM parts due to their layer-upon-layer nature. Present work focuses on the PolyJet process, where each layer is built by selective jetting of photopolymers upon flat surfaces and subsequent UV radiation curing. An extensive experimental program was carried out to find out if the so-constructed parts present viscoelastic behavior and if their mechanical characteristics also depend on part orientation. Both hypotheses have been proven true, so a viscoelastic orthotropic-like behavior shall be expected in PolyJet manufactured part. Nevertheless, a significant improvement on material properties has been found for nearly vertical building orientations. This unexpected behavior is related to a shielding effect upon UV curing caused by support material.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2014.200