scholarly journals Investigation on Chalcogenide Glass Additive Manufacturing for Shaping Mid-infrared Optical Components and Microstructured Optical Fibers

Crystals ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 228
Author(s):  
Julie Carcreff ◽  
François Cheviré ◽  
Ronan Lebullenger ◽  
Antoine Gautier ◽  
Radwan Chahal ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Chalcogenide Glass ◽  
Optical Fibers ◽  
Chalcogenide Glasses ◽  
Optical Devices ◽  
Optical Components ◽  
Mid Infrared ◽  
Before And After ◽  
The Impact

In this work, an original way of shaping chalcogenide optical components has been investigated. Thorough evaluation of the properties of chalcogenide glasses before and after 3D printing has been carried out in order to determine the impact of the 3D additive manufacturing process on the material. In order to evaluate the potential of such additive glass manufacturing, several preliminary results obtained with various chalcogenide objects and components, such as cylinders, beads, drawing preforms and sensors, are described and discussed. This innovative 3D printing method opens the way for many applications involving chalcogenide fiber elaboration, but also many other chalcogenide glass optical devices.

scholarly journals Ultra-High Early Strength Cementitious Grout Suitable for Additive Manufacturing Applications Fabricated by Using Graphene Oxide and Viscosity Modifying Agents

Polymers ◽  
2020 ◽  
Vol 12 (12) ◽  
pp. 2900
Author(s):  
Alyaa Mohammed ◽  
Nihad Tareq Khshain Al-Saadi
Keyword(s):  
Graphene Oxide ◽  
Additive Manufacturing ◽  
3D Printing ◽  
Design Method ◽  
Three Dimensional ◽  
Cementitious Materials ◽  
Fresh Properties ◽  
Manufacturing Applications ◽  
Mechanical Strengths ◽  
The Impact

One of the considerable challenges in the design of cementitious mixtures for additive manufacturing/three-dimensional (3D) printing applications is achieving both suitable fresh properties and significant mechanical strengths. This paper presents the use of graphene oxide (GO) as a promising nano reinforcement material with the potential to improve the printing feasibility and quality of a 3D printed cementitious matrix. Additionally, in this study, a viscosity modifying agent (VMA) was employed as a chemical additive to attain the required consistency and flow. The printed mixture was fabricated using various cementitious materials and waste materials. This study investigated the impact of GO and VMA on the enhancement of the 3D printing of cementitious composites through several tests. A flow test was conducted using the flow table test. The results showed a high fluidity and practical consistency, which are essential for nozzle pumping and accurateness in printed shapes. Furthermore, the bleeding test showed minimal bleeding up to hardening, and a considerable self-cleaning ability was noted during handling when conducting examinations of fresh properties. For hardened properties, the mechanical strengths were exceptionally high, especially at early ages, which is crucial for the stability of sequence layers of printed composites. The tensile strengths were 3.77, 10.5, 13.35, and 18.83 MPa at 1, 3, 7, and 28 days, respectively, and the compressive strengths were 25.1, 68.4, 85.6, and 125.4 MPa at 1, 3, 7, and 28 days, respectively. The test results showed the effectiveness of the fabricated cementitious mixture design method for meeting the requirements for 3D concrete printing applications.

Optimization of Manufacturability of Chalcogenide Glasses for Mid-infrared Optical Components

2014 ◽  
Author(s):  
Kathleen A. Richardson ◽  
Charmayne Smith ◽  
Erick Koontz ◽  
Karima Chamma ◽  
Benn Gleason ◽  
...  
Keyword(s):  
Chalcogenide Glasses ◽  
Optical Components ◽  
Mid Infrared

Solid Microstructured Chalcogenide Glass Optical Fibers for the Near- and Mid-Infrared Spectral Regions

2009 ◽  
Vol 21 (24) ◽  
pp. 1804-1806 ◽  
Author(s):  
Zheng Gang Lian ◽  
Qing Quan Li ◽  
D. Furniss ◽  
T.M. Benson ◽  
A.B. Seddon
Keyword(s):  
Chalcogenide Glass ◽  
Optical Fibers ◽  
Mid Infrared ◽  
Infrared Spectral

Finite Element Analysis of Additive Manufacturing Based on Fused Deposition Modeling: Distortions Prediction and Comparison With Experimental Data

2018 ◽  
Vol 141 (1) ◽  
Author(s):  
Alberto Cattenone ◽  
Simone Morganti ◽  
Gianluca Alaimo ◽  
Ferdinando Auricchio
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Fused Deposition Modeling ◽  
Step Size ◽  
Time Step ◽  
Time Step Size ◽  
Fused Deposition ◽  
Deposition Modeling ◽  
The Impact ◽  
Functional Components

Additive manufacturing (or three-dimensional (3D) printing) is constantly growing as an innovative process for the production of complex-shape components. Among the seven recognized 3D printing technologies, fused deposition modeling (FDM) covers a very important role, not only for producing representative 3D models, but, mainly due to the development of innovative material like Peek and Ultem, also for realizing structurally functional components. However, being FDM a production process involving high thermal gradients, non-negligible deformations and residual stresses may affect the 3D printed component. In this work we focus on meso/macroscopic simulations of the FDM process using abaqus software. After describing in detail the methodological process, we investigate the impact of several parameters and modeling choices (e.g., mesh size, material model, time-step size) on simulation outcomes and we validate the obtained results with experimental measurements.

scholarly journals Impact of 3D Printing on Occupational Therapy Student Technology Efficacy

2021 ◽  
Vol 5 (4) ◽  
pp. 571-586
Author(s):  
Kimberly Davis ◽  
Laura Gurney
Keyword(s):  
3D Printing ◽  
Occupational Therapy ◽  
Control Group ◽  
Educational Module ◽  
Design Modification ◽  
Student Groups ◽  
Occupational Therapy Students ◽  
Before And After ◽  
3D Printers ◽  
The Impact

This study examines a mixed methods experiment, evaluating the impact of 3D printing on Occupational Therapy student’s self-reported technology efficacy levels, before and after an educational module focused on 3D printing technology. Utilizing free and online software and university owned 3D printers, students were challenged to create client centered assistive devices. Software included free computer aided drafting software, slicing software, and an online design repository. Copyright and attribution licensing concepts were also addressed for design modification considerations and use in clinical settings. Participants explored adaptations of 3D designs to meet individualized client needs and integration of rehabilitative theories. Project-based implementation of 3D printing with ‘real world’ clients created increased student ‘buy-in’ and engagement. Participants were recruited from private, rural, higher education, occupational therapy students in pre-clinical lab courses. Comparisons between student groups exposed to 3D printing and a control group without exposure are assessed using quantitative and qualitative data. The control group expressed interest in further technology education in their field. Students show significant increases in technology focused self-efficacy between participant groups.

scholarly journals 3D printing of chalcogenide glasses: an original way for the elaboration of microstructured preforms and optical fibers (Conference Presentation)

2020 ◽  
Author(s):  
Johann Troles ◽  
Julie Carcreff ◽  
Francois Chevire ◽  
Elodie Galdo ◽  
Ronan Lebullenger ◽  
...  
Keyword(s):  
3D Printing ◽  
Optical Fibers ◽  
Chalcogenide Glasses

scholarly journals Towards Distributed Recycling with Additive Manufacturing of PET Flake Feedstocks

Materials ◽  
2020 ◽  
Vol 13 (19) ◽  
pp. 4273
Author(s):  
Helen A. Little ◽  
Nagendra G. Tanikella ◽  
Matthew J. Reich ◽  
Matthew J. Fiedler ◽  
Samantha L. Snabes ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Thermal Characterization ◽  
3D Print ◽  
Wide Range ◽  
3D Printed ◽  
Sequential Combination ◽  
Future Work ◽  
The Impact ◽  
First Time

This study explores the potential to reach a circular economy for post-consumer Recycled Polyethylene Terephthalate (rPET) packaging and bottles by using it as a Distributed Recycling for Additive Manufacturing (DRAM) feedstock. Specifically, for the first time, rPET water bottle flake is processed using only an open source toolchain with Fused Particle Fabrication (FPF) or Fused Granular Fabrication (FGF) processing rather than first converting it to filament. In this study, first the impact of granulation, sifting, and heating (and their sequential combination) is quantified on the shape and size distribution of the rPET flakes. Then 3D printing tests were performed on the rPET flake with two different feed systems: an external feeder and feed tube augmented with a motorized auger screw, and an extruder-mounted hopper that enables direct 3D printing. Two Gigabot X machines were used, each with the different feed systems, and one without and the latter with extended part cooling. 3D print settings were optimized based on thermal characterization, and both systems were shown to 3D print rPET directly from shredded water bottles. Mechanical testing showed the importance of isolating rPET from moisture and that geometry was important for uniform extrusion. The mechanical strength of 3D-printed parts with FPF and inconsistent flow is lower than optimized fused filament, but adequate for a wide range of applications. Future work is needed to improve consistency and enable water bottles to be used as a widespread DRAM feedstock.

3D printing poses complex crime risks globally

2018 ◽  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Thin Layers ◽  
Content Type ◽  
Broad Term ◽  
Conventional Weapons ◽  
Improvised Explosive ◽  
Explosive Devices ◽  
The Impact ◽  
Crime Risks

Subject 3D printing crime. Significance Additive manufacturing -- a broad term for constructing objects by laying down myriad thin layers -- is currently most evident in 3D printing, using a material, usually a polymer, deposited through a computer-controlled nozzle according to a pre-modelled blueprint. Other base ingredients are being investigated that will in due course allow the additive manufacturing of products from chemicals to human organs, all of which have significant security implications. Impacts The impact on access to conventional weapons will be minimal given the existing black market. The scope for a massive proliferation in improvised explosive devices and other tools will transform terrorism. The opportunities for production of drugs will make interdiction at borders ineffective. Sanctions regimes based on controlling access to components will become increasingly redundant.

Case study of the additive manufacturing application in the supersonic flow researches

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jefte da Silva Guimarães ◽  
Valéria Serrano Faillace Oliveira Leite ◽  
Marco Antonio Sala Minucci ◽  
Dermeval Carinhana
Keyword(s):  
Additive Manufacturing ◽  
Supersonic Flow ◽  
3D Printing ◽  
Dimensional Change ◽  
Supersonic Combustion ◽  
Measuring System ◽  
Content Type ◽  
Before And After ◽  
New Perspective

Purpose The purpose of this paper is to demonstrate the aerodynamic behavior of a supersonic combustion test bench (SCTB) components, as the transition piece and the combustor of a scramjet (supersonic combustion ramjet), manufactured by 3D printing or additive manufacturing (AM). Design/methodology/approach For the dimensional and structural analysis of the manufactured models, a portable 3D scanner was used to generate the mesh of its dimensions, and to compare them before and after the experiments, a roughness measuring system was also used to verify the roughness inside the models before and after the tests, as roughness is an important parameter because it directly affects the boundary layer. For the visualization of the flow, the non-intrusive schlieren optical technique was used. Findings The experiments were carried out on the SCBT for Mach 2 flows, using the manufactured prototypes and showed that there was no structural and dimensional change of the model after the test batteries. It was found that the roughness presented by the material did not affect the quality of the flow generated. This shows that the investigated material can also be applied in experiments with supersonic flow. Originality/value This paper presents that it is possible to use in ground test facilities, for the studies of supersonic flow (in cold condition), pieces and models manufactured by 3D printing without affecting the quality of the flow generated during the experiments. This study presents a new perspective to approach AM applied in the studies of supersonic flows.

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