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Polymers
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Additive Manufacturing of Polymers, 2nd Edition
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Additive Manufacturing of Polymers, 2nd Edition

A special issue of Polymers (ISSN 2073-4360). This special issue belongs to the section "Polymer Applications".

Deadline for manuscript submissions: closed (30 September 2024) | Viewed by 3467

Special Issue Editors

Dr. Guiwei Li

E-Mail
Guest Editor
School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Interests: 3D printing; additive manufacturing; biomimetic manufacturing; 4D printing; hybrid additive manufacturing
Special Issues, Collections and Topics in MDPI journals
Dr. Wenzheng Wu

E-Mail Website
Guest Editor
School of Mechanical and Aerospace Engineering, Jilin University, Changchun 130025, China
Interests: 3D printing; polymer additive manufacturing; biomimetic manufacturing; 4D printing; hybrid additive manufacturing
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Additive manufacturing (AM), including 3D/4D printing, can be applied in numerous areas of engineering. Generally, 4D printing is described as the 3D printing of smart materials that can change shape or whose other properties alter over time under external stimuli, such as humidity, light, heat, electric fields, or magnetic fields. Polymers are the main material employed in additive manufacturing, and the 3D/4D printing of complex polymer-based parts can be processed via FDM/FFF, SLS, SLA/DLP, IDW, and hybrid additive manufacturing technologies.

This Special Issue of Polymers aims to cover the state of the art of polymer-based materials in additive manufacturing, especially in 3D and 4D printing, with a special emphasis on novel processing methods. In addition, perspectives and critical reviews regarding the current limitations, future directions and emerging applications in the field are welcome.

Dr. Guiwei Li
Dr. Wenzheng Wu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Polymers is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • 3D printing
  • polymer additive manufacturing
  • 4D printing
  • hybrid additive manufacturing
  • biomimetic manufacturing
  • FDM
  • FFF

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Published Papers (3 papers)

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Research

19 pages, 10016 KiB  
Article
Investigation into Influence of Tensile Properties When Varying Print Settings of 3D-Printed Polylactic Acid Parts: Numerical Model and Validation
by Khalil Homrani, Steven Volcher, Edouard Riviere Lorphèvre, Anthonin Demarbaix, Jérémy Odent, Margaux Lorenzoni, Laurent Spitaels and François Ducobu
Polymers 2024, 16(16), 2253; https://doi.org/10.3390/polym16162253 - 8 Aug 2024
Viewed by 1135
Abstract
Material Extrusion (MEX), particularly Fused Filament Fabrication (FFF), is the most widespread among the additive manufacturing (AM) technologies. To further its development, understanding the influence of the various printing parameters on the manufactured parts is required. The effects of varying the infill percentage, [...] Read more.
Material Extrusion (MEX), particularly Fused Filament Fabrication (FFF), is the most widespread among the additive manufacturing (AM) technologies. To further its development, understanding the influence of the various printing parameters on the manufactured parts is required. The effects of varying the infill percentage, the number of layers of the top and bottom surfaces and the number of layers of the side surfaces on the tensile properties of the printed parts were studied by using a full factorial design. The tensile test results allowed a direct comparison of each of the three parameters’ influence on the tensile properties of the parts to be conducted. Yield strength appears to be the most affected by the number of layers of the top and bottom surfaces, which has twice the impact of the number of layers of the side surfaces, which is already twice as impactful as the infill percentage. Young’s modulus is the most influenced by the number of layers of the top and bottom surfaces, then by the infill percentage and finally by the number of layers of the side surfaces. Two mathematical models were considered in this work. The first one was a polynomial model, which allowed the yield strength to be calculated as a function of the three parameters mentioned previously. The coefficients of this model were obtained by performing tensile tests on nine groups of printed samples, each with different printing parameters. Each group consisted of three samples. A second simplified model was devised, replacing the numbers of layers on the side and top/bottom surfaces with their fractions of the cross-section surface area of the specimen. This model provided results with a better correlation with the experimental results. Further tests inside and outside the parameter ranges initially chosen for the model were performed. The experimental results aligned well with the predictions and made it possible to assess the accuracy of the model, indicating the latter to be sufficient and reliable. The accuracy of the model was assessed through the R2 value obtained, R2 = 92.47%. This was improved to R2 = 97.32% when discarding material infill as an input parameter. Full article
(This article belongs to the Special Issue Additive Manufacturing of Polymers, 2nd Edition)
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17 pages, 8697 KiB  
Article
An Analysis of the Displacements in 3D-Printed PLA Acoustic Guitars
by Álvaro Burgos-Pintos, Francisco Fernández-Zacarías, Pedro F. Mayuet, Ricardo Hernández-Molina and Lucía Rodríguez-Parada
Polymers 2024, 16(15), 2108; https://doi.org/10.3390/polym16152108 - 24 Jul 2024
Viewed by 727
Abstract
This study focuses on the analysis of the displacements generated in 3D-printed acoustic guitar tops. Specifically, the influence of 3D printing direction parameters on the vibrational behavior of a guitar top designed for polylactic acid (PLA) by analyzing five points of the top [...] Read more.
This study focuses on the analysis of the displacements generated in 3D-printed acoustic guitar tops. Specifically, the influence of 3D printing direction parameters on the vibrational behavior of a guitar top designed for polylactic acid (PLA) by analyzing five points of the top surface at a reduced scale. For this purpose, finite element tests and laboratory experiments have been carried out to support the study. After analyzing the results, it can be affirmed that the vibrational response in reduced-scale top plates can be modified and controlled by varying the printing direction angle in additive manufacturing, providing relevant information about the displacement in the vibrational response of PLA acoustic guitars. Furthermore, this work shows that the behavior of a specific acoustic guitar design can be characterized according to a specific need. Full article
(This article belongs to the Special Issue Additive Manufacturing of Polymers, 2nd Edition)
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17 pages, 5282 KiB  
Article
Mechanical Characteristics of Sandwich Structures with 3D-Printed Bio-Inspired Gyroid Structure Core and Carbon Fiber-Reinforced Polymer Laminate Face-Sheet
by Harri Junaedi, Marwa A. Abd El-baky, Mahmoud M. Awd Allah and Tamer A. Sebaey
Polymers 2024, 16(12), 1698; https://doi.org/10.3390/polym16121698 - 14 Jun 2024
Cited by 4 | Viewed by 1262
Abstract
The gyroid structure is a bio-inspired structure that was discovered in butterfly wings. The geometric design of the gyroid structure in butterfly wings offers a unique combination of strength and flexibility. This study investigated sandwich panels consisting of a 3D-printed gyroid structure core [...] Read more.
The gyroid structure is a bio-inspired structure that was discovered in butterfly wings. The geometric design of the gyroid structure in butterfly wings offers a unique combination of strength and flexibility. This study investigated sandwich panels consisting of a 3D-printed gyroid structure core and carbon fiber-reinforced polymer (CFRP) facing skin. A filament fused fabrication 3D printer machine was used to print the gyroid cores with three different relative densities, namely 10%, 15%, and 20%. Polylactic acid (PLA) was used as the printing material for the gyroid. The gyroid structure was then sandwiched and joined by an epoxy resin between CFRP laminates. Polyurethane foam (PUF) was filled into the gyroid core to fill the cavity on the core for another set of samples. Flexural and compression tests were performed on the samples to investigate the mechanical behavior of the sandwiches. Moreover, the two-parameter Weibull distribution was used to evaluate the results statistically. As a result, the sandwich-specific facing stress and core shear strength from the three-point bending test of the composites increased with the increase in sandwich density. Core density controls the flexural characteristics of the sandwich. Adding PUF improves the deflection at the maximum stress and the sustained load after fracture of the sandwich. Compression strength, modulus, and energy absorbed by gyroid core sandwiches and their specific properties are higher than the PUF-filled gyroid core sandwiches at equal sandwich density. Full article
(This article belongs to the Special Issue Additive Manufacturing of Polymers, 2nd Edition)
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