scholarly journals A Comparative Study between Polymer and Metal Additive Manufacturing Approaches in Investigating Stiffened Hexagonal Cells

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 883
Author(s):  
Othman Laban ◽  
Elsadig Mahdi ◽  
Samahat Samim ◽  
John-John Cabibihan
Keyword(s):  
Additive Manufacturing ◽  
Failure Modes ◽  
Fused Deposition Modelling ◽  
Complex Structures ◽  
Metal Additive Manufacturing ◽  
Fused Deposition ◽  
Base Materials ◽  
Load Carrying ◽  
Manufacturing Technologies ◽  
Metal Additive

Recent polymer and metal additive manufacturing technologies were proven capable of building complex structures with high accuracy. Although their final products differ significantly in terms of mechanical properties and building cost, many structural optimization studies were performed with either one without systematic justification. Therefore, this study investigated whether the Direct Metal Laser Sintering (DMLS) and Fused Deposition Modelling (FDM) methodologies can provide similar conclusions when performing geometrical manipulations for optimizing structural crashworthiness. Two identical sets of four shapes of stiffened hexagonal cells were built and crushed under quasi-static loading. The results were compared in terms of collapsing behavior, load-carrying performance, and energy-absorption capability. Although the observed failure modes were different since the base-materials differ, similar improvement trends in performance were observed between both fabrication approaches. Therefore, FDM was recommended as a fabrication method to optimize thin-walled cellular hexagonal parameters since it was 80% more time-efficient and 53.6% cheaper than the DMLS technique.

scholarly journals Metal Additive Manufacturing for Satellites and Rockets

2021 ◽  
Vol 11 (24) ◽  
pp. 12036
Author(s):  
Tomasz Blachowicz ◽  
Guido Ehrmann ◽  
Andrea Ehrmann
Keyword(s):  
Additive Manufacturing ◽  
Three Dimensional ◽  
Heat Pipes ◽  
Space Applications ◽  
Metal Additive Manufacturing ◽  
Magnetic Shields ◽  
Custom Made ◽  
Manufacturing Technologies ◽  
Harsh Conditions ◽  
Metal Additive

The emerging technology of 3D printing can not only be used for rapid prototyping, but will also play an important role in space exploration. Additive manufactured parts can be used in diverse space applications, such as magnetic shields, heat pipes, thrusters, etc. Three-dimensional printed parts offer reduced mass, high possible complexity, and fast printability of custom-made objects. On the other hand, materials which are not excessively damaged by the harsh conditions in space and are also printable by available technologies are not abundantly available. This review gives an overview of recent metal additive manufacturing technologies and their possible applications in space, with a focus on satellites and rockets, highlighting already applied technologies and materials and gives an outlook on possible future applications and challenges.

scholarly journals Additive Manufacturing Applications on Flexible Actuators for Active Orthoses and Medical Devices

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Michele Gabrio Antonelli ◽  
Pierluigi Beomonte Zobel ◽  
Francesco Durante ◽  
Terenziano Raparelli
Keyword(s):  
Additive Manufacturing ◽  
Acrylonitrile Butadiene Styrene ◽  
Variable Stiffness ◽  
Fused Deposition Modelling ◽  
Research Projects ◽  
Element Analysis ◽  
Pneumatic Actuators ◽  
Fused Deposition ◽  
Manufacturing Applications ◽  
Manufacturing Technologies

This paper describes the results of research projects developed at the University of L’Aquila by the research group of the authors in the field of biomedical engineering, which have seen an important use of additive manufacturing technologies in the prototyping step and, in some cases, also for the realization of preindustrialization prototypes. For these projects, commercial 3D printers and technologies such as fused deposition modelling (FDM) were used; the most commonly used polymers in these technologies are acrylonitrile butadiene styrene (ABS) and polylactic acid (PLA). The research projects concern the development of innovative actuators, such as pneumatic muscles and soft pneumatic actuators (SPAs), the development of active orthoses, such as a lower limb orthosis and, finally, the development of a variable-stiffness grasper to be used in natural orifice transluminal endoscopic surgery (NOTES). The main aspects of these research projects are described in the paper, highlighting the technologies used such as the finite element analysis and additive manufacturing.

scholarly journals Smart Build-Plate for Metal Additive Manufacturing Processes

Sensors ◽  
2020 ◽  
Vol 20 (2) ◽  
pp. 360 ◽  
Author(s):  
Adam Hehr ◽  
Mark Norfolk ◽  
Dan Kominsky ◽  
Andrew Boulanger ◽  
Matthew Davis ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Fiber Optic ◽  
Defect Formation ◽  
High Definition ◽  
Powder Bed ◽  
Metal Additive Manufacturing ◽  
Ultrasonic Additive Manufacturing ◽  
Fiber Optic Sensing ◽  
Manufacturing Technologies ◽  
Metal Additive

This paper discusses the development, processing steps, and evaluation of a smart build-plate or baseplate tool for metal additive manufacturing technologies. This tool uses an embedded high-definition fiber optic sensing fiber to measure strain states from temperature and residual stress within the build-plate for monitoring purposes. Monitoring entails quality tracking for consistency along with identifying defect formation and growth, i.e., delamination or crack events near the build-plate surface. An aluminum alloy 6061 build-plate was manufactured using ultrasonic additive manufacturing due to the process’ low formation temperature and capability of embedding fiber optic sensing fiber without damage. Laser-powder bed fusion (L-PBF) was then used to print problematic geometries onto the build-plate using AlSi10Mg for evaluation purposes. The tool identified heat generation, delamination onset, and delamination growth of the printed L-PBF parts.

scholarly journals New fabrication method using additive manufacturing technologies for the pattern of pressed lithium disilicate onlay restorations

2017 ◽  
Vol 20 (4) ◽  
pp. 149
Author(s):  
Marta Revilla-Leon ◽  
Marina Olea-Vielba ◽  
Ana Esteso-Díaz ◽  
Iñaki Martinez-Klemm ◽  
Jose Manuel Reuss Rodriguez-Vilaboa ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Fused Deposition Modelling ◽  
3 Dimensional ◽  
Material Extrusion ◽  
Fused Deposition ◽  
Direct Light ◽  
Accuracy And Precision ◽  
Manufacturing Technologies ◽  
Dental Applications ◽  
Am Processes

<p>There are 7 categories for the additive manufacturing (AM) technologies and a wide variety of materials that can be used to build a computer aided designed (CAD) 3-Dimensional (3D) object. The present article reviews the main AM processes for polymers for dental applications: stereolithography (SLA), direct light processing (DLP), material jetting (MJ) and material extrusion (ME). The manufacturing process, accuracy and precision of these methods will be reviewed, as well as, their prosthodontic applications.</p><p> </p><p><strong>Keywords: </strong>3D printing; Additive manufacturing technologies; Direct light processing; Fused deposition modelling; Material extrusion; Material jetting; Multijet printing; Prosthodontics; Stereolitography.</p>

A Review of Metal Additive Manufacturing Technologies

2018 ◽  
Vol 278 ◽  
pp. 1-14 ◽  
Author(s):  
Mostafa Yakout ◽  
M.A. Elbestawi ◽  
Stephen C. Veldhuis
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
3D Model ◽  
Important Process ◽  
Stainless Steel 316L ◽  
Metal Additive Manufacturing ◽  
Aerospace Alloys ◽  
Key Technologies ◽  
Manufacturing Technologies ◽  
Metal Additive

Additive manufacturing is a layer based manufacturing process aimed at producing parts directly from a 3D model. This paper provides a review of key technologies for metal additive manufacturing. It focuses on the effect of important process parameters on the microstructure and mechanical properties of the resulting part. Several materials are considered including aerospace alloys such as titanium (TiAl6V4 “UNS R56400”), aluminum (AlSi10Mg “UNS A03600”), iron-and nickel-based alloys (stainless steel 316L “UNS S31603”, Inconel 718 “UNS N07718”, and Invar 36 FeNi36 “UNS K93600”).

scholarly journals Methods for the Characterization of Polyetherimide Based Materials Processed by Fused Deposition Modelling

2020 ◽  
Vol 10 (9) ◽  
pp. 3195 ◽  
Author(s):  
Claudio Tosto ◽  
Lorena Saitta ◽  
Eugenio Pergolizzi ◽  
Ignazio Blanco ◽  
Giovanni Celano ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Mechanical Tests ◽  
Fused Deposition Modelling ◽  
Specific Test ◽  
Test Standards ◽  
Fused Deposition ◽  
Structural Applications ◽  
Mechanical Performances ◽  
Manufacturing Technologies

Fused deposition modelling (FDM™) is one of the most promising additive manufacturing technologies and its application in industrial practice is increasingly spreading. Among its successful applications, FDM™ is used in structural applications thanks to the mechanical performances guaranteed by the printed parts. Currently, a shared international standard specifically developed for the testing of FDM™ printed parts is not available. To overcome this limit, we have considered three different tests aimed at characterizing the mechanical properties of technological materials: tensile test (ASTM D638), flexural test (ISO 178) and short-beam shear test (ASTM D2344M). Two aerospace qualified ULTEMTM 9085 resins (i.e., tan and black grades) have been used for printing all specimens by means of an industrial printer (Fortus 400mc). The aim of this research was to improve the understanding of the efficiency of different mechanical tests to characterize materials used for FDM™. For each type of test, the influence on the mechanical properties of the specimen’s materials and geometry was studied using experimental designs. For each test, 22 screening factorial designs were considered and analyzed. The obtained results demonstrated that the use of statistical analysis is recommended to ascertain the real pivotal effects and that specific test standards for FDM™ components are needed to support the development of materials in the additive manufacturing field.

scholarly journals WAAM and Other Unconventional Metal Additive Manufacturing Technologies

2020 ◽  
Vol 45 (2) ◽  
pp. 1-9
Author(s):  
Damjan Klobčar ◽  
Sebastijan Baloš ◽  
Matija Bašić ◽  
Aleksija Djurić ◽  
Maja Lindič ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Processing Parameters ◽  
Functionally Graded ◽  
High Deposition Rate ◽  
Graded Materials ◽  
Metal Additive Manufacturing ◽  
Ultrasonic Additive Manufacturing ◽  
Materials Used ◽  
Manufacturing Technologies ◽  
Metal Additive

The paper presents an overview of metal additive manufacturing technologies. The emphasis is on unconventional emerging technologies with firm background on welding technologies such as Ultrasonic Additive Manufacturing, Friction Additive Manufacturing, Thermal Spray Additive Manufacturing, Resistance Additive Manufacturing and Wire and Arc Additive Manufacturing. The particular processes are explained in detail and their advantages and drawbacks are presented. Attention is made on materials used, possibilities to produce multi-material products and functionally graded materials, and typical applications of currently developed technologies. The state-of-the-art on the Wire and Arc Additive Manufacturing is presented in more detail due to high research interests, it’s potential and widespread. The main differences between different arc additive manufacturing technologies are shown. An influence of processing parameters is discussed with respect to process stability and process control. The challenges related to path planning are shown together with the importance of post-processing. The main advantage of presented technologies is their ability of making larger and multi-material parts, with high deposition rate, which is difficult to achieve using conventional additive technologies.

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