State-of-the-Art Review on Additive Manufacturing Technology in Railway Infrastructure Systems

Additive manufacturing technologies, well known as three-dimensional printing (3DP) technologies, have been applied in many industrial fields, including aerospace, automobiles, shipbuilding, civil engineering and nuclear power. However, despite the high material utilization and the ability to rapidly construct complex shaped structures of 3D printing technologies, the application of additive manufacturing technologies in railway track infrastructure is still at the exploratory stage. This paper reviews the state-of-the-art research of additive manufacturing technologies related the railway track infrastructure and discusses the challenges and prospects of 3D printing technology in this area. The insights will not only help the development of 3D printing technologies into railway engineering but also enable smarter railway track component design and improve track performance and inspection strategies.

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3D Printing in Heterogeneous Catalysis—The State of the Art

Materials ◽

10.3390/ma13204534 ◽

2020 ◽

Vol 13 (20) ◽

pp. 4534 ◽

Cited By ~ 1

Author(s):

Elżbieta Bogdan ◽

Piotr Michorczyk

Keyword(s):

Additive Manufacturing ◽

Heterogeneous Catalysis ◽

3D Printing ◽

Chemical Synthesis ◽

State Of The Art ◽

Three Dimensional ◽

Production Method ◽

The State ◽

Monolithic Catalysts ◽

Selection Of

This paper describes the process of additive manufacturing and a selection of three-dimensional (3D) printing methods which have applications in chemical synthesis, specifically for the production of monolithic catalysts. A review was conducted on reference literature for 3D printing applications in the field of catalysis. It was proven that 3D printing is a promising production method for catalysts.

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A New Approach to Micromachining: High-Precision and Innovative Additive Manufacturing Solutions Based on Photopolymerization Technology

Materials ◽

10.3390/ma13132951 ◽

2020 ◽

Vol 13 (13) ◽

pp. 2951 ◽

Cited By ~ 2

Author(s):

Paweł Fiedor ◽

Joanna Ortyl

Keyword(s):

Additive Manufacturing ◽

3D Printing ◽

Liquid Crystal Display ◽

Three Dimensional ◽

Digital Light Processing ◽

3D Objects ◽

Conscious Choice ◽

Optical Applications ◽

Manufacturing Technologies ◽

Printing Processes

The following article introduces technologies that build three dimensional (3D) objects by adding layer-upon-layer of material, also called additive manufacturing technologies. Furthermore, most important features supporting the conscious choice of 3D printing methods for applications in micro and nanomanufacturing are covered. The micromanufacturing method covers photopolymerization-based methods such as stereolithography (SLA), digital light processing (DLP), the liquid crystal display–DLP coupled method, two-photon polymerization (TPP), and inkjet-based methods. Functional photocurable materials, with magnetic, conductive, or specific optical applications in the 3D printing processes are also reviewed.

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Overview of Current Additive Manufacturing Technologies and Selected Applications

Science Progress ◽

10.3184/003685012x13420984463047 ◽

2012 ◽

Vol 95 (3) ◽

pp. 255-282 ◽

Cited By ~ 210

Author(s):

Timothy J. Horn ◽

Ola L. A. Harrysson

Keyword(s):

Additive Manufacturing ◽

State Of The Art ◽

Three Dimensional ◽

New Paradigm ◽

Three Dimensional Printing ◽

The Past ◽

Key Technologies ◽

End Use ◽

Manufacturing Technologies ◽

Dimensional Printing

Three-dimensional printing or rapid prototyping are processes by which components are fabricated directly from computer models by selectively curing, depositing or consolidating materials in successive layers. These technologies have traditionally been limited to the fabrication of models suitable for product visualization but, over the past decade, have quickly developed into a new paradigm called additive manufacturing. We are now beginning to see additive manufacturing used for the fabrication of a range of functional end use components. In this review, we briefly discuss the evolution of additive manufacturing from its roots in accelerating product development to its proliferation into a variety of fields. Here, we focus on some of the key technologies that are advancing additive manufacturing and present some state of the art applications.

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Efficient 3D printing via photooxidation of ketocoumarin based photopolymerization

Nature Communications ◽

10.1038/s41467-021-23170-4 ◽

2021 ◽

Vol 12 (1) ◽

Author(s):

Xiaoyu Zhao ◽

Ye Zhao ◽

Ming-De Li ◽

Zhong’an Li ◽

Haiyan Peng ◽

...

Keyword(s):

Additive Manufacturing ◽

3D Printing ◽

Visible Light ◽

Light Exposure ◽

Three Dimensional ◽

3D Printer ◽

Light Penetration ◽

Viable Solution

AbstractPhotopolymerization-based three-dimensional (3D) printing can enable customized manufacturing that is difficult to achieve through other traditional means. Nevertheless, it remains challenging to achieve efficient 3D printing due to the compromise between print speed and resolution. Herein, we report an efficient 3D printing approach based on the photooxidation of ketocoumarin that functions as the photosensitizer during photopolymerization, which can simultaneously deliver high print speed (5.1 cm h−1) and high print resolution (23 μm) on a common 3D printer. Mechanistically, the initiating radical and deethylated ketocoumarin are both generated upon visible light exposure, with the former giving rise to rapid photopolymerization and high print speed while the latter ensuring high print resolution by confining the light penetration. By comparison, the printed feature is hard to identify when the ketocoumarin encounters photoreduction due to the increased lateral photopolymerization. The proposed approach here provides a viable solution towards efficient additive manufacturing by controlling the photoreaction of photosensitizers during photopolymerization.

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Advances in 3D Printing for Tissue Engineering

Materials ◽

10.3390/ma14123149 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3149

Author(s):

Angelika Zaszczyńska ◽

Maryla Moczulska-Heljak ◽

Arkadiusz Gradys ◽

Paweł Sajkiewicz

Keyword(s):

Tissue Engineering ◽

Additive Manufacturing ◽

3D Printing ◽

Complex Structure ◽

Three Dimensional ◽

Computer Assisted ◽

Scaffold Fabrication ◽

Manufacturing Techniques ◽

Printing Techniques ◽

State Of Art

Tissue engineering (TE) scaffolds have enormous significance for the possibility of regeneration of complex tissue structures or even whole organs. Three-dimensional (3D) printing techniques allow fabricating TE scaffolds, having an extremely complex structure, in a repeatable and precise manner. Moreover, they enable the easy application of computer-assisted methods to TE scaffold design. The latest additive manufacturing techniques open up opportunities not otherwise available. This study aimed to summarize the state-of-art field of 3D printing techniques in applications for tissue engineering with a focus on the latest advancements. The following topics are discussed: systematics of the available 3D printing techniques applied for TE scaffold fabrication; overview of 3D printable biomaterials and advancements in 3D-printing-assisted tissue engineering.

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Additive Manufacturing: The Next Generation of Scapholunate Ligament Reconstruction

Journal of Wrist Surgery ◽

10.1055/s-0041-1729993 ◽

2021 ◽

Author(s):

Matthew N. Rush ◽

Christina Salas ◽

Lorraine Mottishaw ◽

Damian Fountain ◽

Deana Mercer

Keyword(s):

Additive Manufacturing ◽

Ligament Reconstruction ◽

Three Dimensional ◽

Biological Properties ◽

Bone Interface ◽

Significant Strength ◽

Efficient Integration ◽

Manufacturing Methods ◽

Manufacturing Techniques ◽

Manufacturing Technologies

Abstract Background Ligament reconstruction, as a surgical method used to stabilize joints, requires significant strength and tissue anchoring to restore function. Historically, reconstructive materials have been fraught with problems from an inability to withstand normal physiological loads to difficulties in fabricating the complex organization structure of native tissue at the ligament-to-bone interface. In combination, these factors have prevented the successful realization of nonautograft reconstruction. Methods A review of recent improvements in additive manufacturing techniques and biomaterials highlight possible options for ligament replacement. Description of Technique In combination, three dimensional-printing and electrospinning have begun to provide for nonautograft options that can meet the physiological load and architectures of native tissues; however, a combination of manufacturing methods is needed to allow for bone-ligament enthesis. Hybrid biofabrication of bone-ligament tissue scaffolds, through the simultaneous deposition of disparate materials, offer significant advantages over fused manufacturing methods which lack efficient integration between bone and ligament materials. Results In this review, we discuss the important chemical and biological properties of ligament enthesis and describe recent advancements in additive manufacturing to meet mechanical and biological requirements for a successful bone–ligament–bone interface. Conclusions With continued advancement of additive manufacturing technologies and improved biomaterial properties, tissue engineered bone-ligament scaffolds may soon enter the clinical realm.

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Algorithm to Reduce Leading and Lagging in Conformal Direct-Print

Journal of Manufacturing Science and Engineering ◽

10.1115/1.4040730 ◽

2018 ◽

Vol 140 (10) ◽

Cited By ~ 2

Author(s):

Morteza Vatani ◽

Faez Alkadi ◽

Jae-Won Choi

Keyword(s):

Additive Manufacturing ◽

3D Printing ◽

3D Model ◽

Three Dimensional ◽

Motion Direction ◽

B Spline ◽

And Topology ◽

Printing System ◽

3D Printed ◽

Printed Patterns

A novel additive manufacturing algorithm was developed to increase the consistency of three-dimensional (3D) printed curvilinear or conformal patterns on freeform surfaces. The algorithm dynamically and locally compensates the nozzle location with respect to the pattern geometry, motion direction, and topology of the substrate to minimize lagging or leading during conformal printing. The printing algorithm was implemented in an existing 3D printing system that consists of an extrusion-based dispensing module and an XYZ-stage. A dispensing head is fixed on a Z-axis and moves vertically, while the substrate is installed on an XY-stage and moves in the x–y plane. The printing algorithm approximates the printed pattern using nonuniform rational B-spline (NURBS) curves translated directly from a 3D model. Results showed that the proposed printing algorithm increases the consistency in the width of the printed patterns. It is envisioned that the proposed algorithm can facilitate nonplanar 3D printing using common and commercially available Cartesian-type 3D printing systems.

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A Review of Bone Graft Substitutes Made From HA-Polymer Composite Scaffolds and Fabrication Potential With Laser-Based Additive Manufacturing Processes

Volume 1: Processing ◽

10.1115/msec2015-9366 ◽

2015 ◽

Author(s):

Hera Wu ◽

Shuting Lei

Keyword(s):

Additive Manufacturing ◽

Bone Graft ◽

Three Dimensional ◽

Bone Graft Substitute ◽

Biological Properties ◽

Porous Scaffolds ◽

Composite Scaffolds ◽

Bone Graft Substitutes ◽

Manufacturing Technologies ◽

High Level

Hydroxyapatite, a bioactive ceramic, has been combined with biodegradable polymers to create composite three-dimensional interconnected porous scaffolds for bone graft substitutes. The materials and fabrication methods of these composite scaffolds are reviewed. The resulting mechanical and biological properties of scaffolds produced from the combination of certain materials and fabrication methods are analyzed. Requirements for a bone graft substitute and third generation scaffolds with the addition of osteoinductive and osteogenic features to composite scaffolds including biomolecule delivery and cell seeding are also introduced. Finally, the benefits of using additive manufacturing technologies to enable high level of control over the design of interconnected pore structure are discussed.

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Additive Manufacturing of Biopolymers for Tissue Engineering and Regenerative Medicine: An Overview, Potential Applications, Advancements, and Trends

International Journal of Polymer Science ◽

10.1155/2021/4907027 ◽

2021 ◽

Vol 2021 ◽

pp. 1-20 ◽

Cited By ~ 2

Author(s):

Dhinakaran Veeman ◽

M. Swapna Sai ◽

P. Sureshkumar ◽

T. Jagadeesha ◽

L. Natrayan ◽

...

Keyword(s):

Tissue Engineering ◽

Additive Manufacturing ◽

3D Printing ◽

Regenerative Medicine ◽

Tissue Regeneration ◽

Three Dimensional ◽

Porous Scaffolds ◽

Wide Range ◽

Potential Applications ◽

Pharmaceutical Industries

As a technique of producing fabric engineering scaffolds, three-dimensional (3D) printing has tremendous possibilities. 3D printing applications are restricted to a wide range of biomaterials in the field of regenerative medicine and tissue engineering. Due to their biocompatibility, bioactiveness, and biodegradability, biopolymers such as collagen, alginate, silk fibroin, chitosan, alginate, cellulose, and starch are used in a variety of fields, including the food, biomedical, regeneration, agriculture, packaging, and pharmaceutical industries. The benefits of producing 3D-printed scaffolds are many, including the capacity to produce complicated geometries, porosity, and multicell coculture and to take growth factors into account. In particular, the additional production of biopolymers offers new options to produce 3D structures and materials with specialised patterns and properties. In the realm of tissue engineering and regenerative medicine (TERM), important progress has been accomplished; now, several state-of-the-art techniques are used to produce porous scaffolds for organ or tissue regeneration to be suited for tissue technology. Natural biopolymeric materials are often better suited for designing and manufacturing healing equipment than temporary implants and tissue regeneration materials owing to its appropriate properties and biocompatibility. The review focuses on the additive manufacturing of biopolymers with significant changes, advancements, trends, and developments in regenerative medicine and tissue engineering with potential applications.

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Laser Additive Manufacturing

3D Printing ◽

10.4018/978-1-5225-1677-4.ch008 ◽

2017 ◽

pp. 154-171 ◽

Cited By ~ 1

Author(s):

Rasheedat M. Mahamood ◽

Esther T. Akinlabi

Keyword(s):

Additive Manufacturing ◽

Manufacturing Process ◽

Computer Aided Design ◽

Selective Laser Sintering ◽

Three Dimensional ◽

Cad Model ◽

Laser Additive Manufacturing ◽

Computer Aided ◽

Manufacturing Technologies ◽

Aided Design

Laser additive manufacturing is an advanced manufacturing process for making prototypes as well as functional parts directly from the three dimensional (3D) Computer-Aided Design (CAD) model of the part and the parts are built up adding materials layer after layer, until the part is competed. Of all the additive manufacturing process, laser additive manufacturing is more favoured because of the advantages that laser offers. Laser is characterized by collimated linear beam that can be accurately controlled. This chapter brings to light, the various laser additive manufacturing technologies such as: - selective laser sintering and melting, stereolithography and laser metal deposition. Each of these laser additive manufacturing technologies are described with their merits and demerits as well as their areas of applications. Properties of some of the parts produced through these processes are also reviewed in this chapter.

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