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Article

Investigation of the Shape-Memory Properties of 3D Printed PLA Structures with Different Infills

by 1 and 1,2,*
1
Virtual Institute of Applied Research on Advanced Materials (VIARAM)
2
Faculty of Engineering and Mathematics, Bielefeld University of Applied Sciences, 33619 Bielefeld, Germany
*
Author to whom correspondence should be addressed.
This paper is an extended version of the results presented and published in The First International Conference on “Green” Polymer Materials 2020, 5–25 November 2020.
Polymers 2021, 13(1), 164; https://doi.org/10.3390/polym13010164
Received: 13 December 2020 / Revised: 29 December 2020 / Accepted: 30 December 2020 / Published: 5 January 2021
(This article belongs to the Special Issue Feature Papers of Green and Sustainable Chemistry in Polymer Science)
Polylactic acid (PLA) belongs to the few thermoplastic polymers that are derived from renewable resources such as corn starch or sugar cane. PLA is often used in 3D printing by fused deposition modeling (FDM) as it is relatively easy to print, does not show warping and can be printed without a closed building chamber. On the other hand, PLA has interesting mechanical properties which are influenced by the printing parameters and geometries. Here we present shape-memory properties of PLA cubes with different infill patterns and percentages, extending the research reported before in a conference paper. We investigate the material response under defined quasi-static load as well as the possibility to restore the original 3D printed shape. The quasi-static flexural properties are linked to the porosity and the infill structure of the samples under investigation as well as to the numbers of closed top layers, examined optically and by simulations. Our results underline the importance of designing the infill patterns carefully to develop samples with desired mechanical properties. View Full-Text
Keywords: polylactic acid (PLA); fused deposition modeling; 3-point bending test; infill parameters; infill density; shape-memory properties polylactic acid (PLA); fused deposition modeling; 3-point bending test; infill parameters; infill density; shape-memory properties
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MDPI and ACS Style

Ehrmann, G.; Ehrmann, A. Investigation of the Shape-Memory Properties of 3D Printed PLA Structures with Different Infills. Polymers 2021, 13, 164. https://doi.org/10.3390/polym13010164

AMA Style

Ehrmann G, Ehrmann A. Investigation of the Shape-Memory Properties of 3D Printed PLA Structures with Different Infills. Polymers. 2021; 13(1):164. https://doi.org/10.3390/polym13010164

Chicago/Turabian Style

Ehrmann, Guido, and Andrea Ehrmann. 2021. "Investigation of the Shape-Memory Properties of 3D Printed PLA Structures with Different Infills" Polymers 13, no. 1: 164. https://doi.org/10.3390/polym13010164

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