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Experimental Modal Analysis and Characterization of Additively Manufactured Polymers

Modern 3D printed components are finding applications in dynamic structures. These structures are often subject to dynamic loadings. To date, research has mostly focused on investigating the mechanical properties of these 3D printed structures with minimum attention paid to their modal analysis. Thi...

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Autores principales: Nguyen, Hieu Tri, Crittenden, Kelly, Weiss, Leland, Bardaweel, Hamzeh
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147211/
https://www.ncbi.nlm.nih.gov/pubmed/35631952
http://dx.doi.org/10.3390/polym14102071
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author Nguyen, Hieu Tri
Crittenden, Kelly
Weiss, Leland
Bardaweel, Hamzeh
author_facet Nguyen, Hieu Tri
Crittenden, Kelly
Weiss, Leland
Bardaweel, Hamzeh
author_sort Nguyen, Hieu Tri
collection PubMed
description Modern 3D printed components are finding applications in dynamic structures. These structures are often subject to dynamic loadings. To date, research has mostly focused on investigating the mechanical properties of these 3D printed structures with minimum attention paid to their modal analysis. This work is focused on performing experimental modal analysis of 3D printed structures. The results show that the adhesion type has the most significant impact on the vibration response and parameters obtained from the modal analysis. The average dynamic modulus, natural frequency, and damping coefficient increased by approximately 12.5%, 5.5%, and 36%, respectively, for the specimens printed using skirt adhesion compared to those printed using raft adhesion. SEM analysis suggests that the 3D printed specimens with skirt adhesion yielded flattened layers, while raft adhesion resulted in rounded layers. The flattened layers of the specimens with skirt adhesion are likely an indication of an enhanced heat transfer between the 3D printer bed and the specimen. The printed specimens with skirt adhesion are in direct contact with the printer bed during the printing process. This enhances the heat transfer between the specimen and the printer bed, causing the layers to flatten out. The enhanced heat transfer yields a better inter-layer diffusion, resulting in improved physical bonding at the layers’ interface. The improved bonding yields higher stiffnesses and natural frequencies. For the specimens with skirt adhesion, the improved heat transfer process is also likely responsible for the enhanced damping properties. The strengthened inter-layer bonding at the layer–layer interface provides better energy dissipation along the contact lines between the layers.
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spelling pubmed-91472112022-05-29 Experimental Modal Analysis and Characterization of Additively Manufactured Polymers Nguyen, Hieu Tri Crittenden, Kelly Weiss, Leland Bardaweel, Hamzeh Polymers (Basel) Article Modern 3D printed components are finding applications in dynamic structures. These structures are often subject to dynamic loadings. To date, research has mostly focused on investigating the mechanical properties of these 3D printed structures with minimum attention paid to their modal analysis. This work is focused on performing experimental modal analysis of 3D printed structures. The results show that the adhesion type has the most significant impact on the vibration response and parameters obtained from the modal analysis. The average dynamic modulus, natural frequency, and damping coefficient increased by approximately 12.5%, 5.5%, and 36%, respectively, for the specimens printed using skirt adhesion compared to those printed using raft adhesion. SEM analysis suggests that the 3D printed specimens with skirt adhesion yielded flattened layers, while raft adhesion resulted in rounded layers. The flattened layers of the specimens with skirt adhesion are likely an indication of an enhanced heat transfer between the 3D printer bed and the specimen. The printed specimens with skirt adhesion are in direct contact with the printer bed during the printing process. This enhances the heat transfer between the specimen and the printer bed, causing the layers to flatten out. The enhanced heat transfer yields a better inter-layer diffusion, resulting in improved physical bonding at the layers’ interface. The improved bonding yields higher stiffnesses and natural frequencies. For the specimens with skirt adhesion, the improved heat transfer process is also likely responsible for the enhanced damping properties. The strengthened inter-layer bonding at the layer–layer interface provides better energy dissipation along the contact lines between the layers. MDPI 2022-05-19 /pmc/articles/PMC9147211/ /pubmed/35631952 http://dx.doi.org/10.3390/polym14102071 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Nguyen, Hieu Tri
Crittenden, Kelly
Weiss, Leland
Bardaweel, Hamzeh
Experimental Modal Analysis and Characterization of Additively Manufactured Polymers
title Experimental Modal Analysis and Characterization of Additively Manufactured Polymers
title_full Experimental Modal Analysis and Characterization of Additively Manufactured Polymers
title_fullStr Experimental Modal Analysis and Characterization of Additively Manufactured Polymers
title_full_unstemmed Experimental Modal Analysis and Characterization of Additively Manufactured Polymers
title_short Experimental Modal Analysis and Characterization of Additively Manufactured Polymers
title_sort experimental modal analysis and characterization of additively manufactured polymers
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9147211/
https://www.ncbi.nlm.nih.gov/pubmed/35631952
http://dx.doi.org/10.3390/polym14102071
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