scholarly journals Development of a 3D Printable and Highly Stretchable Ternary Organic-Inorganic Nanocomposite Hydrogel

2021 ◽  
Author(s):  
Chen Hu ◽  
Malik Haider ◽  
Lukas Hahn ◽  
Mengshi Yang ◽  
Robert Luxenhofer
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Nanocomposite Hydrogel ◽  
Highly Stretchable ◽  
Manufacturing Techniques ◽  
Advanced Applications

Hydrogels that can be processed with additive manufacturing techniques and concomitantly possess favorable mechanical properties are interesting for many advanced applications. However, the development of novel ink materials with high...

Variance Quantification of Different Additive Manufacturing Processes for Acoustic Meta Materials

2021 ◽  
Vol 263 (4) ◽  
pp. 2708-2723
Author(s):  
Manuel Bopp ◽  
Arn Joerger ◽  
Matthias Behrendt ◽  
Albert Albers
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Production Process ◽  
Laser Scanning ◽  
Mode Shapes ◽  
Manufacturing Processes ◽  
3D Laser Scanning ◽  
Fused Filament Fabrication ◽  
Manufacturing Techniques ◽  
Different Levels

Many concepts for acoustic meta materials rely on additive manufacturing techniques. Depending on the production process and material of choice, different levels of precision and repeatability can be achieved. In addition, different materials have different mechanical properties, many of which are frequency dependent and cannot easily be measured directly. In this contribution the authors have designed different resonator elements, which have been manufactured utilizing Fused Filament Fabrication with ABSplus and PLA, as well as PolyJet Fabrication with VeroWhitePlus. All structures are computed in FEA to obtain the calculated Eigenfrequencies and mode shapes, with the respective literature values for each material. Furthermore, the dynamic behavior of multiple instances of each structure is measured utilizing a 3D-Laser-Scanning Vibrometer under shaker excitation, to obtain the actual Eigenfrequencies and mode shapes. The results are then analyzed in regards to variance between different print instances, and in regards to accordance between measured and calculated results. Based on previous work and this analysis the parameters of the FEA models are updated to improve the result quality.

scholarly journals Mechanical properties comparison of Ti6Al4V produced by different technologies under static load conditions

2019 ◽  
Vol 290 ◽  
pp. 08010
Author(s):  
Karolina Karolewska ◽  
Bogdan Ligaj
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Ti6al4v Alloy ◽  
Direct Metal Laser Sintering ◽  
Static Tests ◽  
Rolling Method ◽  
Manufacturing Techniques ◽  
Materials Used

The most commonly used technology among the additive manufacturing is Direct Metal Laser Sintering (DMLS). This process is based on selective laser sintering (SLS). The method gained its popularity due to the possibility of producing metal parts of any geometry, which would be difficult or impossible to obtain by the use of conventional manufacturing techniques. Materials used in the elements manufacturing process are: titanium alloys (e.g. Ti6Al4V), aluminium alloy AlSi10Mg, etc. Elements printed from Ti6Al4V titanium alloy find their application in many industries. Details produced by additive technology are often used in medicine as skeletal, and dental implants. Another example of the DMLS elements use is the aerospace industry. In this area, the additive manufacturing technology produces, i.a. parts of turbines. In addition to the aerospace and medical industries, DMLS technology is also used in motorsport for exhaust pipes or the gearbox parts. The research objects are samples for static tests. These samples were made of Ti6Al4V alloy by the DMLS method and the rolling method from a drawn rod. The aim of the paper is the mechanical properties comparative analysis of the Ti6Al4V alloy produced by the DMLS method under static loading conditions and microstructure analysis of this material.

Properties of Aluminium Alloys Produced by Selective Laser Melting

2016 ◽  
Vol 710 ◽  
pp. 83-88 ◽  
Author(s):  
Paola Bassani ◽  
Carlo Alberto Biffi ◽  
Riccardo Casati ◽  
Adrianni Zanatta Alarcon ◽  
Ausonio Tuissi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Aluminium Alloys ◽  
Al Alloys ◽  
Laser Melting ◽  
Microstructural Refinement ◽  
Manufacturing Techniques

Analysis of peculiar properties offered by Al alloys produced according to additive manufacturing techniques, specifically by Selective Laser Melting (SLM), is carried out. Two alloys are considered, derived by casting (AlSi10Mg) and by wrought (ENAW 2618) applications. The SLM processed samples are investigated considering their microstructural and mechanical properties after SLM and compared to cast and wrought counterparts. A strong microstructural refinement induced by SLM processing is observed for both alloys, resulting in excellent hardness properties. Investigation on integrity of samples revealed that small-size microvoids and unmelted regions could be present in SLM parts.

scholarly journals Determination of the anisotropic fatigue behaviour of additively manufactured structures with short-time procedure PhyBaLLIT

2018 ◽  
Vol 165 ◽  
pp. 02006 ◽  
Author(s):  
Bastian Blinn ◽  
Marcus Klein ◽  
Tilmann Beck
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Vertical Direction ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Special Focus ◽  
Component Design ◽  
Physically Based ◽  
Manufacturing Techniques ◽  
Oriented Parallel

Additive Manufacturing techniques provide completely new possibilities in component design and creation of innovative material structures. To utilize the whole potential of Additive Manufacturing, the microstructure, the mechanical properties and their interrelations as well as their relationship to the Additive Manufacturing process parameters are essential. Investigations of the fatigue behaviour of additively manufactured (AM-) metallic materials are still available in limited extent. However, as a prerequisite for efficient and reliable use of AM-components in safety relevant structures, sound knowledge of fatigue behaviour and properties of these structures is indispensable. A central aspect in Additive Manufacturing is the anisotropic mechanical behaviour under monotonic and cyclic loading in dependency on the building direction [1, 2]. In the present work, the microstructure and mechanical properties of Selective Laser Melted (SLM) as well as Laser Deposition Welded (LDW) AISI 316L stainless steel specimens are investigated with special focus on the influence of the building direction. The investigated specimens are built in horizontal and vertical direction, resulting in layer planes oriented parallel and perpendicular to the loading direction, respectively. The fatigue tests have been performed on a servohydraulic testing system with measurement of stress-strain-hysteresis as well as of plastic deformation induced changes in temperature and specific electrical resistance. S-Nf-curves in the HCF-regime of AM-specimens have been determined with the time and material efficient Physically Based Lifetime calculation procedure PhyBaLLIT [3]. Anisotropic fatigue behaviour of the different AM-specimens has been rated with load increase tests (LIT) and the usage of S-Nfcurves calculated by the PhyBaLLIT method.

Characterization of Ceramic-Hydrogel Composites for Use in Bone Scaffolds Made Using Additive Manufacturing Techniques

MRS Advances ◽  
2016 ◽  
Vol 1 (29) ◽  
pp. 2161-2166
Author(s):  
Mayra Elizabeth García-Sánchez ◽  
Jorge A. Perez-Naitoh ◽  
Daniel E. Ramirez-Arreola ◽  
Jorge R. Robledo-Ortíz ◽  
Pedro Ortega-Gudiño ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Ethylene Glycol ◽  
Tissue Regeneration ◽  
Artificial Bone ◽  
Poly Ethylene Glycol ◽  
Bone Scaffolds ◽  
Manufacturing Techniques ◽  
Poly Ethylene ◽  
The Right

ABSTRACTOverall, autologous bone grafting continues to be the gold standard for the restoration of bone defects while other practices include metallic meshes and plates. These practices are not always suitable particularly when performing reconstructive surgery in the maxillofacial region as the defects tend to be complex in terms of size and shape. These bone defect usually occur due to trauma, infection or a result of oncologic surgeries and therefore the patient requires large amount of bone grafting material [1].There is a need for alternative methods such as is artificial bone scaffolds with regenerative medicine approaches in order to enable original tissue regeneration. In order to stimulate tissue regeneration scaffolding materials are required to have certain properties such as biocompatibility, adequate mechanical properties and internal and surface topographical features in order to provide specific biological signals to promote cell attachment and proliferation. Ideally, it would also need to be biodegradable and provide sufficient support for both the particular defect area and cellular ingrowth to degrade over time as new bone tissue is formed [2]. This work analyses the mechanical and chemical properties of Hydroxyapatite (HA) - poly(ethylene glycol) dimethacrylate (PEGDMA) and Hydroxyapatite (HA) - poly(ethylene glycol) diacrylate (PEGDA) based composites used as artificial bone scaffold material with internal structures optimized using finite element analysis (FEA) using Hyperworks OptiStruct (Altair, USA) Topological Optimization and manufactured using commercially available additive manufacturing techniques in order to develop a product that can be introduced directly into the patient. The technique allows implants to be custom made, having the right dimensions and the right mechanical properties.Testing of the ceramic-hydrogel composite include mechanical testing in compression, tension, bending, impact and hardness while chemical analysis include Fourier Transform Infrared spectroscopy (ATR-FTIR) and Differential Scanning Calorimetry (DSC). Morphology was analyzed using Scanning Electron Microscopy (SEM) and Laser Scanning Confocal Microscopy.

scholarly journals Development of a 3D Printable and Highly Stretchable Ternary Organic-Inorganic Nanocomposite Hydrogel

2021 ◽  
Author(s):  
Chen Hu ◽  
Malik Salman Haider ◽  
Lukas Hahn ◽  
Mengshi Yang ◽  
Robert Luxenhofer
Keyword(s):  
Mechanical Properties ◽  
Free Radical ◽  
Polymer Network ◽  
Nanocomposite Hydrogel ◽  
Detailed Characterization ◽  
Hybrid Hydrogel ◽  
Clay Nanoparticles ◽  
Highly Stretchable ◽  
3D Printed

This work describes the synthesis and detailed characterization of a ternary hybrid hydrogel comprising a thermogelling hydrogel containing laponite clay nanoparticles, in which an additional polymer network is polymerized by free radical polymerization. The precursor hydrogel can be effectively 3D printed and after curing, interesting mechanical properties are obtained.<br>

scholarly journals Laser Welding of AISI 316L Stainless Steel Produced by Additive Manufacturing or by Conventional Processes

2021 ◽  
Vol 5 (4) ◽  
pp. 136
Author(s):  
Morgane Mokhtari ◽  
Pierrick Pommier ◽  
Yannick Balcaen ◽  
Joel Alexis
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Laser Welding ◽  
Aisi 316L Stainless Steel ◽  
Powder Bed ◽  
Size Limitation ◽  
Common Technique ◽  
Cold Rolled ◽  
Manufacturing Techniques ◽  
Complex Parts

Among all the additive manufacturing techniques, Laser Powder Bed Fusion (LBPF), also called Selective Laser Melting (SLM), is the most common technique due to its high capability of building complex parts with generally improved mechanical properties. One of the main drawbacks of this technique is the sample size limitation, which depends on elaborating chamber dimensions. In this study, we investigate the viability of obtaining large parts with the laser welding of additive manufactured plates. A comparison of the microstructure and the tensile mechanical properties of SLM-welded plates and cold-rolled welded plates was performed. This paper shows the possibility of obtaining defect-free parts. Even if welding has a low impact on the microstructure of the SLM samples, fractures are located on the fusion zone, and a decrease in ductility of around 30% compared to the base metal is observed.

scholarly journals Engineering Thermoplastics for Additive Manufacturing: A Critical Perspective with Experimental Evidence to Support Functional Applications

2017 ◽  
Vol 15 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Gianluca Cicala ◽  
Alberta Latteri ◽  
Barbara Del Curto ◽  
Alessio Lo Russo ◽  
Giuseppe Recca ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Injection Molding ◽  
Fused Deposition Modeling ◽  
Mechanical And Thermal Properties ◽  
Functional Applications ◽  
Fused Deposition ◽  
Industrial Grade ◽  
Raster Angle ◽  
Manufacturing Techniques

Background Among additive manufacturing techniques, the filament-based technique involves what is referred to as fused deposition modeling (FDM). FDM materials are currently limited to a selected number of polymers. The present study focused on investigating the potential of using high-end engineering polymers in FDM. In addition, a critical review of the materials available on the market compared with those studied here was completed. Methods Different engineering thermoplastics, ranging from industrial grade polycarbonates to novel polyetheretherketones (PEEKs), were processed by FDM. Prior to this, for innovative filaments based on PEEK, extrusion processing was carried out. Mechanical properties (i.e., tensile and flexural) were investigated for each extruded material. An industrial-type FDM machine (Stratasys Fortus® 400 mc) was used to fully characterize the effect of printing parameters on the mechanical properties of polycarbonate. The obtained properties were compared with samples obtained by injection molding. Finally, FDM samples made of PEEK were also characterized and compared with those obtained by injection molding. Results The effect of raster to raster air gap and raster angle on tensile and flexural properties of printed PC was evidenced; the potential of PEEK filaments, as novel FDM material, was highlighted in comparison to state of the art materials. Conclusions Comparison with injection molded parts allowed to better understand FDM potential for functional applications. The study discussed pros and cons of the different materials. Finally, the development of novel PEEK filaments achieved important results offering a novel solution to the market when high mechanical and thermal properties are required.

scholarly journals Current Status and Perspectives on Wire and Arc Additive Manufacturing (WAAM)

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1121 ◽  
Author(s):  
Tiago A. Rodrigues ◽  
V. Duarte ◽  
R.M. Miranda ◽  
Telmo G. Santos ◽  
J.P. Oliveira
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Three Dimensional ◽  
Current Status ◽  
Powder Bed ◽  
Significant Research ◽  
Manufacturing Techniques ◽  
Materials Used ◽  
Metallic Parts ◽  
General Perspective

Additive manufacturing has revolutionized the manufacturing paradigm in recent years due to the possibility of creating complex shaped three-dimensional parts which can be difficult or impossible to obtain by conventional manufacturing processes. Among the different additive manufacturing techniques, wire and arc additive manufacturing (WAAM) is suitable to produce large metallic parts owing to the high deposition rates achieved, which are significantly larger than powder-bed techniques, for example. The interest in WAAM is steadily increasing, and consequently, significant research efforts are underway. This review paper aims to provide an overview of the most significant achievements in WAAM, highlighting process developments and variants to control the microstructure, mechanical properties, and defect generation in the as-built parts; the most relevant engineering materials used; the main deposition strategies adopted to minimize residual stresses and the effect of post-processing heat treatments to improve the mechanical properties of the parts. An important aspect that still hinders this technology is certification and nondestructive testing of the parts, and this is discussed. Finally, a general perspective of future advancements is presented.

scholarly journals Study of the Microstructure and Mechanical Properties Obtained by Laser Boost in SLM Process for the Ti-64 Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1611-1617
Author(s):  
Caroline Widomski ◽  
Denis Solas ◽  
François Brisset ◽  
Anne Laure Helbert ◽  
Thierry Baudin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Selective Laser Melting ◽  
Maximum Strength ◽  
Post Processing ◽  
Laser Melting ◽  
Melting Area ◽  
Microstructure And Mechanical Properties ◽  
Manufacturing Techniques ◽  
Complex Parts

Selective laser melting (SLM) is one of the new additive manufacturing techniques in which complex parts can be created directly by selectively melting layers of powder. If the productivity of the process is too fast, defects (porosity, partially melted powder, spatters …) are generated inside the fabricated parts and can deteriorate the mechanical properties of the product. A new Laser Boost strategy with a larger melting area and a productivity of 43.20 cm3/h has been compared to a Linear Classic strategy. Ti-64 alloy samples were elaborated with both strategies to study their influence on microstructure and mechanical properties. Laser Boost strategy leads to the formation of Ti-64 prior β grains that are larger than the Linear Classic strategy. Mechanical properties obtains are similar with both strategies with a maximum strength average around 1250MPa and an elongation at failure between 3 and 9%. A thermal post-processing by Hot Isostatic Pressure have been carried out on samples made by Laser Boost to increase the ductility of the material up to 15%.

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