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Damping of 3D-printed polymer microbeam resonators

de Winter, Jikke (author), Manzaneque Garcia, T. (author), Ghatkesar, M.K. (author)

The emerging high-resolution 3D printing technique called two-photon polymerization (2PP) enables to print devices bottom-up rapidly, contrary to the top-down lithography-based fabrication methods. In this work, various polymer microbeams are 3D printed and their resonant characteristics are analyzed to understand the origin of damping. The...

journal article 2024

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Initiation and evolution of systemic innovations: Patterns and interactions in the emergence of additive manufacturing technologies

Luomaranta, Toni (author), Martinsuo, Miia (author), Ortt, J.R. (author)

Technological innovations are becoming increasingly systemic in the complex and interconnected world. The initiation and evolution of systemic innovations take time and include numerous challenges, and the mechanisms through which systemic innovations emerge in the interaction between different technologies represent a research gap. This...

journal article 2024

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Active Acoustic Metamaterial Based on Helmholtz Resonators to Absorb Broadband Low-Frequency Noise

Hedayati, R. (author), Lakshmanan, Sandhya P. (author)

The aim of the present work is to design active acoustic metamaterial consisting of an array of Helmholtz resonators and fabricating them using an additive manufacturing technique in order to assist in a reduction in noise levels in aerospace applications. To this aim, initially, a passive metamaterial consisting of an array of 64 Helmholtz...

journal article 2024

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An Analytical Model for Nonlinear-Elastic Compliant Mechanisms With Tension–Compression Asymmetry

Hargrove, Brianne (author), Frecker, Mary (author), Nastevska, Angela (author), Jovanova, J. (author)

While nonlinear-elastic materials demonstrate potential in enhancing the performance of compliant mechanisms, their behavior still needs to be captured in a generalized mechanical model. To inform new designs and functionality of compliant mechanisms, a better understanding of nonlinear-elastic materials is necessary and, in particular, their...

journal article 2024

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Exploring High-Precision Non-Assembly Mechanisms: Design of a Vitrectome Mechanism for Eye Surgery

Lussenburg, K.M. (author), Scali, Marta (author), Stolk, Maarten (author), Robijns, D. (author), Sakes, A. (author), Breedveld, P. (author)

A vitrectome is a commonly used instrument in eye surgery, which is used to cut and aspirate the vitreous body out of the eye. The mechanism of the vitrectome consists of miniature components that need to be assembled by hand due to their size. Non-assembly 3D printing, in which fully functional mechanisms can be produced in a single production...

journal article 2023

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Hydrogen Embrittlement of Inconel 718 Manufactured by Laser Powder Bed Fusion Using Sustainable Feedstock: Effect of Heat Treatment and Microstructural Anisotropy

Mohandas, N.K. (author), Giorgini, Alex (author), Vanazzi, Matteo (author), Riemslag, A.C. (author), Scott, S.P. (author), Popovich, V. (author)

This study investigated the in-situ gaseous (under 150 bar) hydrogen embrittlement behaviour of additively manufactured (AM) Inconel 718 produced from sustainable feedstock. Here, sustainable feedstock refers to the Inconel 718 powder produced by vacuum induction melting inert gas atomisation of failed printed parts or waste from CNC machining....

journal article 2023

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Additive Manufacturing of Linear Continuous Permittivity Profiles and their Application to Cylindrical Dielectric Resonator Antennas

Hehenberger, S.P. (author), Caizzone, Stefano (author), Yarovoy, Alexander (author)

The utilization of additive manufacturing (AM) to engineer the permittivity profile of dielectric resonator antennas (DRAs) is considered. For the first time, the capabilities of AM are exploited to create continuously swept permittivity profiles and applied to cylindrical DRAs. The spatial variant lattices (SVL) synthesis algorithm is...

journal article 2023

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Deep Learning for Size-Agnostic Inverse Design of Random-Network 3D Printed Mechanical Metamaterials

Pahlavani, H. (author), Tsifoutis-Kazolis, Kostas (author), Cruz Saldivar, M. (author), Mody, Prerak (author), Zhou, J. (author), Mirzaali, Mohammad J. (author), Zadpoor, A.A. (author)

Practical applications of mechanical metamaterials often involve solving inverse problems aimed at finding microarchitectures that give rise to certain properties. The limited resolution of additive manufacturing techniques often requires solving such inverse problems for specific specimen sizes. Moreover, the candidate microarchitectures...

journal article 2023

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In Vivo Prevention of Implant-Associated Infections Caused by Antibiotic-Resistant Bacteria through Biofunctionalization of Additively Manufactured Porous Titanium

van Hengel, I.A.J. (author), van Dijk, B. (author), Modaresifar, K. (author), Hooning van Duyvenbode, J. Fred F. (author), Nurmohamed, F. Ruben H.A. (author), Leeflang, M.A. (author), Fluit, A.C. (author), Fratila-Apachitei, E.L. (author), Apachitei, I. (author), Weinans, Harrie (author), Zadpoor, A.A. (author)

Additively manufactured (AM) porous titanium implants may have an increased risk of implant-associated infection (IAI) due to their huge internal surfaces. However, the same surface, when biofunctionalized, can be used to prevent IAI. Here, we used a rat implant infection model to evaluate the biocompatibility and infection prevention...

journal article 2023

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3D Printing of Habitats on Mars: Effects of Low Temperature and Pressure

Hedayati, R. (author), Stulova, Victoria (author)

Due to payload weight limitations and human vulnerability to harsh space conditions, it is preferable that the potential landing location for humans has an already constructed habitat preferably made from in situ materials. Therefore, the prospect of utilizing a readily available Martian material, such as regolith, in an easily programmable...

journal article 2023

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3D Printing of Flow-Inspired Anisotropic Patterns with Liquid Crystalline Polymers

Houriet, C.C.M.C.A.G. (author), Damodaran, V. (author), Mascolo, Chiara (author), Gantenbein, Silvan (author), Peeters, D.M.J. (author), Masania, K. (author)

Anisotropic materials formed by living organisms possess remarkable mechanical properties due to their intricate microstructure and directional freedom. In contrast, human-made materials face challenges in achieving similar levels of directionality due to material and manufacturability constraints. To overcome these limitations, an approach...

journal article 2023

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An Integrated Workflow for Designing and Fabricating Multi-Functional Building Components through Additive Manufacturing with Clay

Taher, Ammar (author), Așut, Serdar (author), van der Spoel, W.H. (author)

This article presents a project that explores the potential of Additive Manufacturing (AM) for designing and fabricating multi-functional building components for improved climate performance. In this project, an innovative façade wall design was developed by using a computational method in an attempt to integrate a displacement ventilation...

journal article 2023

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Additive Manufacturing of a Miniature Functional Trocar for Eye Surgery

Lussenburg, K.M. (author), Scali, M. (author), Sakes, A. (author), Breedveld, P. (author)

Stereolithography is emerging as a promising additive manufacturing technology for a range of applications in the medical domain. However, for miniature, medical devices such as those used in ophthalmic surgery, a number of production challenges arise due to the small size of the components. In this work, we investigate the challenges of...

journal article 2022

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Microstructural and Hardness Behavior of H13 Tool Steel Manufactured by Ultrasound-Assisted Laser-Directed Energy Deposition

Masaylo, Dmitriy (author), Igoshin, Sergei (author), Popovich, Anatoly (author), Orlov, Alexey (author), Kim, Artem (author), Popovich, V. (author)

Metal additive manufacturing (AM) by Laser-Directed Energy Deposition (L-DED) usually results in the formation of textured columnar grains along the build direction, leading to anisotropic mechanical properties. This can negatively affect the intended application of the product. Anisotropy can be eliminated by modifying the material through an...

journal article 2022

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Topologically optimized cast glass: A new design approach for loadbearing monolithic glass components of reduced annealing time

Damen, J.T.W. (author), Oikonomopoulou, F. (author), Bristogianni, T. (author), Turrin, M. (author)

Up to now, fabricating cast glass components of substantial mass and/or thickness involves a lengthy and perplex annealing process. This has limited the use of this glass manufacturing method in the built environment to simple objects up to the size of regular building bricks, which can be annealed within a few hours. For the first time,...

journal article 2022

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Preventing Antibiotic-Resistant Infections: Additively Manufactured Porous Ti6Al4V Biofunctionalized with Ag and Fe Nanoparticles

Putra, N.E. (author), Leeflang, M.A. (author), Ducret, Verena (author), Patrulea, Viorica (author), Fratila-Apachitei, E.L. (author), Perron, Karl (author), Ye, Hua (author), Zhou, J. (author), Apachitei, I. (author), Zadpoor, A.A. (author)

Implant-associated infections are highly challenging to treat, particularly with the emergence of multidrug-resistant microbials. Effective preventive action is desired to be at the implant site. Surface biofunctionalization of implants through Ag-doping has demonstrated potent antibacterial results. However, it may adversely affect bone...

journal article 2022

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Light-Based Printing of Leachable Salt Molds for Facile Shaping of Complex Structures

Kleger, Nicole (author), Fehlmann, S. (author), Lee, Seunghun S. (author), Dénéréaz, Cyril (author), Cihova, Martina (author), Paunović, Nevena (author), Bao, Yinyin (author), Leroux, Jean Christophe (author), Masania, K. (author)

3D printing is a powerful manufacturing technology for shaping materials into complex structures. While the palette of printable materials continues to expand, the rheological and chemical requisites for printing are not always easy to fulfill. Here, a universal manufacturing platform is reported for shaping materials into intricate...

journal article 2022

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Multi-objective design optimization of 3D micro-architected implants

Garner, E. (author), Wu, J. (author), Zadpoor, A.A. (author)

Recent advances in 3D printable micro-architected materials offer unprecedented possibilities for the development of highly tailored orthopaedic implants. These devices, which are typically made from fully solid materials, significantly alter load transmission to the surrounding bone tissue, potentially leading to interface instability and bone...

journal article 2022

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A Fully 3D-Printed Steerable Instrument for Minimally Invasive Surgery

Culmone, C. (author), Lussenburg, K.M. (author), Alkemade, J.P.E. (author), Smit, G. (author), Sakes, A. (author), Breedveld, P. (author)

In the field of medical instruments, additive manufacturing allows for a drastic reduction in the number of components while improving the functionalities of the final design. In addition, modifications for users’ needs or specific procedures become possible by enabling the production of single customized items. In this work, we present the...

journal article 2021

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Tuning the Nanotopography and Chemical Functionality of 3D Printed Scaffolds through Cellulose Nanocrystal Coatings

Babi, Mouhanad (author), Riesco, Roberto (author), Boyer, Louisa (author), Fatona, Ayodele (author), Accardo, A. (author), Malaquin, Laurent (author), Moran-Mirabal, Jose (author)

In nature, cells exist in three-dimensional (3D) microenvironments with topography, stiffness, surface chemistry, and biological factors that strongly dictate their phenotype and behavior. The cellular microenvironment is an organized structure or scaffold that, together with the cells that live within it, make up living tissue. To mimic...

journal article 2021