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Nonisotropic experimental characterization of the relaxation modulus for PolyJet manufactured parts

Published online by Cambridge University Press:  14 August 2014

David Blanco ,
Pelayo Fernandez  and
Alvaro Noriega
David Blanco*
Affiliation:
Construction and Manufacturing Engineering Department, ARAMO (Advanced Research in Additive Manufacturing), University of Oviedo, Campus of Gijón, Gijón 33203, Spain
Pelayo Fernandez
Affiliation:
Construction and Manufacturing Engineering Department, ARAMO (Advanced Research in Additive Manufacturing), University of Oviedo, Campus of Gijón, Gijón 33203, Spain
Alvaro Noriega
Affiliation:
Construction and Manufacturing Engineering Department, ARAMO (Advanced Research in Additive Manufacturing), University of Oviedo, Campus of Gijón, Gijón 33203, Spain
*
a) Address all correspondence to this author. e-mail: [email protected]
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Abstract

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.

Keywords

polymerizationstrengthstress/strain relationship
Type
Articles
Information
Journal of Materials Research , Volume 29 , Issue 17: Focus Issue: The Materials Science of Additive Manufacturing , 14 September 2014 , pp. 1876 - 1882
Copyright
Copyright © Materials Research Society 2014 

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References

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