Size Effects on the Mechanical Properties of 3D Printed Plaster and PLA Parts
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 7
Abstract
It is common to perform small-scale prototyping before large-scale application of three-dimensional (3D) printing technology and in this case size effects can have an important effect. There has been limited study to date on the size effects associated with 3D printing technology. Plaster and polylactic acid (PLA) were selected as typical inorganic and organic 3D printing materials. Binder jetting was used to print cube plaster specimens for compressive testing and fused deposition molding was used to print PLA beams for flexural testing. Five sizes were used for both plaster and PLA specimens. The experiments found that the compression strength of the plaster specimens decreased by 46% and the bending strength of the PLA specimens decreased by 15% and 39% relative to two printing schemes with the size increasing. Microstructural analysis using a digital image correlation technique were used to understand the specimen size effects observed. Existing size effect theories were used to model experimental results and recommendations are given regarding modeling efficiency. The paper provides experimental evidence on how the size of specimens produced by 3D printing technology influences properties and microstructure.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The first author gratefully acknowledges the financial support provided by the National Natural Science Foundation of China (Grant Nos. 51911530208 and 51978025) and Thousand Talents Plan (Young Professionals).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 7 • July 2021
Copyright
© 2021 American Society of Civil Engineers.
History
Received: Sep 16, 2020
Accepted: Dec 3, 2020
Published online: Apr 28, 2021
Published in print: Jul 1, 2021
Discussion open until: Sep 28, 2021
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