scholarly journals 3D-printed valves to assist noninvasive ventilation procedures during the COVID-19 pandemic: a case study

2020 ◽  
Vol 4 (4) ◽  
pp. 193-202
Author(s):  
Guilherme Arthur Longhitano ◽  
Geovany Candido ◽  
Leonardo Mendes Ribeiro Machado ◽  
Paulo Inforçatti Neto ◽  
Marcelo Fernandes de Oliveira ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Noninvasive Ventilation ◽  
Selective Laser Sintering ◽  
Air Leakage ◽  
Final Model ◽  
Air Contamination ◽  
Sintering Additive ◽  
3D Printed ◽  
Full Face

Aim: To produce valves to be used with full-face snorkeling masks for noninvasive ventilation (NIV) procedure during the coronavirus disease 2019 (COVID-19) pandemic. Materials & methods: ISINNOVA’s Charlotte valves for full-face snorkeling masks used for NIV procedures were redesigned, produced by selective laser sintering additive manufacturing, and submitted to air leakage tests. Results: The final model assembly did not present air leakage during the NIV procedure on human models, minimizing risks of air contamination. Conclusion: This study shows the feasibility of using additive manufactured valves with snorkel facial masks to support health systems during COVID-19 and possible future pandemics.

History of Additive Manufacturing

2017 ◽  
pp. 1-24 ◽  
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Large Scale ◽  
Selective Laser Sintering ◽  
3D Printer ◽  
3D Objects ◽  
History Of ◽  
Pros And Cons ◽  
3D Printed ◽  
The Common

History of additive manufacturing started in the 1980s in Japan. Stereolithography was invented first in 1983. After that tens of other techniques were invented under the common name 3D printing. When stereolithography was invented rapid prototyping did not exists. Tree years later new technique was invented: selective laser sintering (SLS). First commercial SLS was in 1990. At the end of 20t century, first bio-printer was developed. Using bio materials, first kidney was 3D printed. Ten years later, first 3D Printer in the kit was launched to the market. Today we have large scale printers that printed large 3D objects such are cars. 3D printing will be used for printing everything everywhere. List of pros and cons questions rising every day.

Rapid Prototyping Technology for Special Pressure Vessels

2018 ◽  
Vol 919 ◽  
pp. 222-229
Author(s):  
Jiří Šafka ◽  
Filip Veselka ◽  
Martin Lachman ◽  
Michal Ackermann
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
3D Model ◽  
Selective Laser Sintering ◽  
Pressure Vessels ◽  
Pressure Test ◽  
Polypropylene Material ◽  
3D Printed ◽  
Manufacturing Technologies ◽  
Made In

The article deals with the topic of 3D printing of pressure vessels and their testing. The main focus of the research was on a 3D model of the pressure vessel, which was originally designed for a student formula racing car project. The described virtual 3D model was designed with regard to 3D printing. The physical model was manufactured using several additive manufacturing technologies. The first technology was FDM using ULTEM 1010 material. The next technology was SLS (Selective Laser Sintering) using polyamide materials (PA3200GF and PA2220). The last technology was SLA (Stereolithography) using a polypropylene material (Durable). Experimental evaluation of the vessels was carried out by a pressure test, which verified the compactness of the 3D printed parts and their possible porosity. At the end of the article, a comparison of each printed model is made in terms of their final price and weight, together with pressure and thermal resistance.

scholarly journals Optimization of Brake Calipers Using Topology Optimization for Additive Manufacturing

2021 ◽  
Vol 11 (4) ◽  
pp. 1437
Author(s):  
Evangelos Tyflopoulos ◽  
Mathias Lien ◽  
Martin Steinert
Keyword(s):  
Topology Optimization ◽  
Additive Manufacturing ◽  
Optimization Procedure ◽  
Optimization Approach ◽  
Design Flexibility ◽  
Current State ◽  
3D Printed ◽  
Removal Processes ◽  
Material Layout

The weight optimization of a structure can be conducted by using fewer and downsized components, applying lighter materials in production, and removing unwanted material. Topology optimization (TO) is one of the most implemented material removal processes. In addition, when it is oriented towards additive manufacturing (AM), it increases design flexibility. The traditional optimization approach is the compliance optimization, where the material layout of a structure is optimized by minimizing its overall compliance. However, TO, in its current state of the art, is mainly used for design inspiration and not for manufacturing due to design complexities and lack of accuracy of its design solutions. The authors, in this research paper, explore the benefits and the limitations of the TO using as a case study the housings of a front and a rear brake caliper. The calipers were optimized for weight reduction by implementing the aforementioned optimization procedure. Their housings were topologically optimized, partially redesigned, prepared for 3D printing, validated, and 3D printed in titanium using selective laser melting (SLM). The weight of the optimized calipers reduced by 41.6% compared to commercial calipers. Designers interested in either TO or in automotive engineering can exploit the findings in this paper.

scholarly journals Use of 3D printed connectors to redesign full face snorkeling masks in the COVID-19 era: a preliminary technical case-study

2021 ◽  
pp. 100023
Author(s):  
Jacopo Profili ◽  
Rafael Brunet ◽  
Émilie L Dubois ◽  
Vincent Groenhuis ◽  
Lucas A Hof
Keyword(s):  
3D Printed ◽  
Full Face

scholarly journals Towards 3D printed saxophone mouthpiece personalization: Acoustical analysis of design variations

Acta Acustica ◽  
2021 ◽  
Vol 5 ◽  
pp. 46
Author(s):  
Mehmet Ozdemir ◽  
Vasileios Chatziioannou ◽  
Jouke Verlinden ◽  
Gaetano Cascini ◽  
Montserrat Pàmies-Vilà
Keyword(s):  
Additive Manufacturing ◽  
User Study ◽  
Design Parameters ◽  
Acoustical Analysis ◽  
3D Printed ◽  
Mass Personalization

Saxophonists have different expectations from the saxophone mouthpiece, as it significantly affects the playability and the sound of the instrument. A mass personalization paradigm provides unique products to cater to their needs, using the flexibility of additive manufacturing. The lack of quantitative knowledge on mouthpiece design hinders the personalization attempts. This study aims to lay out how design parameters affect mouthpiece characteristics. Twenty-seven 3D-printed mouthpieces with varying design parameters are used in conjunction with an artificial blowing machine, to determine the acoustical relevance of the various mouthpiece designs on four selected mouthpiece features. The influence of the design parameters is evaluated statistically and via a case study with five saxophonists. The analysis shows that seven out of nine parameters tested affect the mouthpiece characteristics by relatively different amounts. A user study demonstrates that saxophonists confirm the results in 7 of 10 cases, and they prefer personalized mouthpieces in 4 of 5 cases. The results present a key contribution to the understanding of mouthpiece design. The findings provide valuable insights for new mouthpiece design and mouthpiece personalization.

scholarly journals Development of SiC/PVB Composite Powders for Selective Laser Sintering Additive Manufacturing of SiC

Materials ◽  
2018 ◽  
Vol 11 (10) ◽  
pp. 2012 ◽  
Author(s):  
Peng Zhou ◽  
Huilin Qi ◽  
Zhenye Zhu ◽  
Huang Qin ◽  
Hui Li ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Ceramic Composite ◽  
Composite Powder ◽  
Selective Laser Sintering ◽  
Particle Surface ◽  
Polyvinyl Butyral ◽  
Composite Powders ◽  
Sintering Additive ◽  
Composite Powder Material ◽  
Composite Granules

Subsphaeroidal SiC/polymer composite granules with good flowability for additive manufacturing/3D printing of SiC were prepared by ball milling with surface modification using polyvinyl butyral (PVB). PVB adheres to the particle surface of SiC to form a crosslinked network structure and keeps them combined with each other into light aggregates. The effects of PVB on the shape, size, phase composition, distribution and flowability of the polymer-ceramic composite powder were investigated in detail. Results show that the composite powder material has good laser absorptivity at wavelengths of lower than 500 nm.

scholarly journals Mode I Fracture Toughness of Polyamide and Alumide Samples obtained by Selective Laser Sintering Additive Process

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 640 ◽  
Author(s):  
Dan Ioan Stoia ◽  
Liviu Marsavina ◽  
Emanoil Linul
Keyword(s):  
Fracture Toughness ◽  
Additive Manufacturing ◽  
Selective Laser Sintering ◽  
Dimensional Accuracy ◽  
Laser Sintering ◽  
Mode I ◽  
Additive Process ◽  
Mode I Fracture ◽  
Mode I Fracture Toughness ◽  
Sintering Additive

Selective Laser Sintering is a flexible additive manufacturing technology that can be used for the fabrication of high-resolution parts. Alongside the shape and dimension of the parts, the mechanical properties are essential for the majority of applications. Therefore, this paper investigates dimensional accuracy and mode I fracture toughness (KIC) of Single Edge Notch Bending samples under a Three Point Bending fixture, according to the ASTM D5045-14 standard. The work focuses on the influence of two major aspects of additive manufacturing: material type (Polyamide PA2200 and Alumide) and part orientation in the building environment (orientations of 0°, 45° and 90° are considered). The rest of the controllable parameters remains constant for all samples. The results reveal a direct link between the sample densities and the dimensional accuracy with orientation. The dimensional accuracy of the samples is also material dependent. For both materials, the angular orientation leads to significant anisotropic behavior in terms of KIC. Moreover, the type of material fundamentally influences the KIC values and the fracture mode. The obtained results can be used in the development of additive manufactured parts in order to obtain predictable dimensional tolerances and fracture properties.

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