scholarly journals Manufacturing methods for medical artificial prostheses– a review

2017 ◽  
Vol 13 (4-2) ◽  
pp. 464-469 ◽  
Author(s):  
Rosdayanti Fua-Nizan ◽  
Ahmad Majdi Abdul Rani ◽  
Mohamad Yazid Din
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Material Design ◽  
Incremental Sheet Forming ◽  
Numerical Control ◽  
Process Efficiency ◽  
Manufacturing Method ◽  
Direct Fabrication ◽  
Manufacturing Methods ◽  
Selection Of

The main objective of this paper is to review the manufacturing methods that can be used for fabricating medical prostheses. The medical prostheses have different functions and applications. Selection of manufacturing method is made based on the material, design, and mechanical properties of the prostheses.  The conventional manufacturing methods that had been applied for manufacturing prostheses are machining, incremental sheet forming and investment casting. The combination of computer numerical control and additive manufacturing has been able to improve the process efficiency of these methods. However, direct fabrication by additive manufacturing has been able to replace the conventional method with better process efficiency and product accuracy. 

A NOVEL, SCALABLE PRODUCTION OF MULTIFUNCTIONAL NANOCOMPOSITE POLYMER FILAMENTS FOR ADDITIVE MANUFACTURING

2021 ◽  
Author(s):  
MIA CARROLA ◽  
AMIR ASADI
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Carbon Nanotubes ◽  
Additive Manufacturing ◽  
Aqueous Suspension ◽  
Manufacturing Method ◽  
Nanocomposite Polymer ◽  
Water As Solvent ◽  
Materials Used ◽  
Scalable Production

Though a revolutionary process, additive manufacturing (AM) has left more to be desired from printed parts, specifically, improved interlayer strength and minimal defects such as porosity. To overcome these common issues, nanocomposites have become one of the most popular materials used in AM, with various nanoparticles used to achieve a variety of characteristics. The use of these technologies together allows for both to synergistically enhance the final printed parts by improving the process and products simultaneously. Here, we introduce a novel, scalable technique to coat ABS pellets with cellulose nanocrystal (CNC) bonded carbon nanotubes (CNT), to improve the adhesion between layers as well as the mechanical properties of printed parts. An aqueous suspension of CNT-CNC is used to coat ABS pellets before they are dried and extruded into filament for printing. The filament produced using this manufacturing method showed an increase in tensile and interlayer strength as well as improved thermal conductivity. This process uses water as solvent and pristine nanoparticles without the need for any functionalization or surfactants, promoting its scalability. This process has the potential to be used with various polymers and nanoparticles, which allows the materials to be specifically tailored to the end application, (i.e. strength, conductivity, antibacterial, etc.). These nanocomposite filaments have the potential to revolutionize the way that additive manufacturing is utilized in a variety of industries.

A Short Glance on Metal 3D AM

2018 ◽  
Vol 786 ◽  
pp. 348-355
Author(s):  
Terho Iso-Junno ◽  
Kimmo Mäkelä ◽  
Kari Mäntyjärvi ◽  
Tero Jokelainen
Keyword(s):  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Future Development ◽  
Cost Efficiency ◽  
Holistic Approach ◽  
Production Method ◽  
Digital Manufacturing ◽  
Laser Melting ◽  
Manufacturing Method ◽  
Manufacturing Methods

Metal 3D AM (Additive Manufacturing) has been becoming a more common production method for larger variety of parts. In this review the current situation and future development trends of the 3D metal AM are presented, concentrating on the SLM (Selective Laser Melting) technology. A holistic approach to the AM as a digital manufacturing method is presented and different manufacturing aspects of the AM production are identified. The most promising aspects for the future development are the automatization of the AM design tasks and automatization of the production. With the development of these aspects the production and cost efficiency of the metal AM can be increased to a more competitive level compared with other manufacturing methods.

scholarly journals Processing and Quality Control of Masks: A Review

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 291
Author(s):  
Sedigheh Farzaneh ◽  
Mohammadali Shirinbayan
Keyword(s):  
Quality Control ◽  
Additive Manufacturing ◽  
Human Body ◽  
Respiratory Resistance ◽  
Manufacturing Method ◽  
Different Types ◽  
Manufacturing Methods

It is clear that viruses, especially COVID-19, can cause infection and injure the human body. These viruses can transfer in different ways, such as in air transfer, which face masks can prevent and reduce. Face masks can protect humans through their filtration function. They include different types and mechanisms of filtration whose performance depends on the texture of the fabric, the latter of which is strongly related to the manufacturing method. Thus, scientists should enrich the information on mask production and quality control by applying a wide variety of tests, such as leakage, dynamic respiratory resistance (DBR), etc. In addition, the primary manufacturing methods (meltblown, spunlaid, drylaid, wetlaid and airlaid) and new additive manufacturing (AM) methods (such as FDM) should be considered. These methods are covered in this study.

Development and experimental study of an automated laser-foil-printing additive manufacturing system

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chia-Hung Hung ◽  
Tunay Turk ◽  
M. Hossein Sehhat ◽  
Ming C. Leu
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Additive Manufacturing ◽  
Mechanical Strength ◽  
Automated System ◽  
304L Stainless Steel ◽  
Powder Bed Fusion ◽  
Content Type ◽  
Powder Bed ◽  
Manufacturing Methods

Purpose This paper aims to present the development and experimental study of a fully automated system using a novel laser additive manufacturing technology called laser foil printing (LFP), to fabricate metal parts layer by layer. The mechanical properties of parts fabricated with this novel system are compared with those of comparable methodologies to emphasize the suitability of this process. Design/methodology/approach Test specimens and parts with different geometries were fabricated from 304L stainless steel foil using an automated LFP system. The dimensions of the fabricated parts were measured, and the mechanical properties of the test specimens were characterized in terms of mechanical strength and elongation. Findings The properties of parts fabricated with the automated LFP system were compared with those of parts fabricated with the powder bed fusion additive manufacturing methods. The mechanical strength is higher than those of parts fabricated by the laser powder bed fusion and directed energy deposition technologies. Originality/value To the best knowledge of authors, this is the first time a fully automated LFP system has been developed and the properties of its fabricated parts were compared with other additive manufacturing methods for evaluation.

scholarly journals A Novel Additive Manufacturing Method of Cellulose Gel

Materials ◽  
2021 ◽  
Vol 14 (22) ◽  
pp. 6988
Author(s):  
Hossein Najaf Zadeh ◽  
Daniel Bowles ◽  
Tim Huber ◽  
Don Clucas
Keyword(s):  
Additive Manufacturing ◽  
Three Dimensional ◽  
Material Design ◽  
Potential Method ◽  
Support Material ◽  
Gel Structure ◽  
Manufacturing Method ◽  
Wide Range ◽  
Need For Support ◽  
Cellulose Gel

Screen-additive manufacturing (SAM) is a potential method for producing small intricate parts without waste generation, offering minimal production cost. A wide range of materials, including gels, can be shaped using this method. A gel material is composed of a three-dimensional cross-linked polymer or colloidal network immersed in a fluid, known as hydrogel when its main constituent fluid is water. Hydrogels are capable of absorbing and retaining large amounts of water. Cellulose gel is among the materials that can form hydrogels and, as shown in this work, has the required properties to be directly SAM, including shear thinning and formation of post-shearing gel structure. In this study, we present the developed method of SAM for the fabrication of complex-shaped cellulose gel and examine whether successive printing layers can be completed without delamination. In addition, we evaluated cellulose SAM without the need for support material. Design of Experiments (DoE) was applied to optimize the SAM settings for printing the novel cellulose-based gel structure. The optimum print settings were then used to print a periodic structure with micro features and without the need for support material.

Mechanical Properties Including Fatigue of CP Ti and Ti-6Al-4V Alloys Fabricated by EBM Additive Manufacturing Method

2017 ◽  
Vol 873 ◽  
pp. 54-59 ◽  
Author(s):  
Young Sin Choi ◽  
Chang Lim Kim ◽  
Gun Hee Kim ◽  
Byoung Soo Lee ◽  
Chang Woo Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
High Strength ◽  
Processing Parameters ◽  
Microstructural Characteristics ◽  
Manufacturing Method ◽  
Ti Alloys ◽  
Initiation And Propagation ◽  
Fatigue Characteristics ◽  
Cp Ti

The Electron Beam Melted (EBM) method is one of the attractive attention thing additive manufacturing methods. By using an EBM additive manufacturing method, CP Ti and Ti-6Al-4V specimen were fabricated with a certain processing parameters. The mechanical properties such as fatigue limit, tensile properties including microstructural characteristics of CP Ti and Ti-6Al-4V specimens fabricated by EBM were confirmed and were compared with the conventional Ti alloys. Additive manufacturing was obtained high strength by creating martensite due to rapid cooling. On the other hand, void occurrence cannot be avoided by the method of using powder, accordingly it had a low fatigue strength value. Therefore, this study focused on that the values of fatigue characteristics of the EBM specimens and conventional specimens were compared and analyzed. EBM CP Ti had good mechanical properties such as yield strength, ultimate tensile strength, elongation and fatigue limits, approximately as same as casting CP Ti. EBM Ti-6Al-4V showed good mechanical properties, but fatigue limits were lower than wroughtTi-6Al-4V. That resulted from the formation of several kinds of internal pores which caused to increase the crack initiation and propagation.

scholarly journals Aluminum Parts Fabricated by Laser-Foil-Printing Additive Manufacturing: Processing, Microstructure, and Mechanical Properties

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 414 ◽  
Author(s):  
Chia-Hung Hung ◽  
Yingqi Li ◽  
Austin Sutton ◽  
Wei-Ting Chen ◽  
Xiangtao Gong ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Additive Manufacturing ◽  
Laser Scanning ◽  
Laser Energy ◽  
Electron Backscattered Diffraction ◽  
Manufacturing Method ◽  
Melt Pool ◽  
Ebsd Technique ◽  
Pool Formation

Fabrication of dense aluminum (Al-1100) parts (>99.3% of relative density) by our recently developed laser-foil-printing (LFP) additive manufacturing method was investigated as described in this paper. This was achieved by using a laser energy density of 7.0 MW/cm2 to stabilize the melt pool formation and create sufficient penetration depth with 300 μm thickness foil. The highest yield strength (YS) and ultimate tensile strength (UTS) in the LFP-fabricated samples reached 111 ± 8 MPa and 128 ± 3 MPa, respectively, along the laser scanning direction. These samples exhibited greater tensile strength but less ductility compared to annealed Al-1100 samples. Fractographic analysis showed elongated gas pores in the tensile test samples. Strong crystallographic texturing along the solidification direction and dense subgrain boundaries in the LFP-fabricated samples were observed by using the electron backscattered diffraction (EBSD) technique.

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