scholarly journals Scalable 3D printing of aperiodic cellular structures by rotational stacking of integral image formation

2021 ◽  
Vol 7 (38) ◽  
Author(s):  
Seok Kim ◽  
Jordan J. Handler ◽  
Young Tae Cho ◽  
George Barbastathis ◽  
Nicholas X. Fang
Keyword(s):  
3D Printing ◽  
Image Formation ◽  
Cellular Structures ◽  
Integral Image

3D printing of ceramic cellular structures for potential nuclear fusion application

2020 ◽  
Vol 35 ◽  
pp. 101348
Author(s):  
Yu Liu ◽  
Zhangwei Chen ◽  
Junjie Li ◽  
Baoping Gong ◽  
Long Wang ◽  
...  
Keyword(s):  
3D Printing ◽  
Nuclear Fusion ◽  
Cellular Structures

3D Printing of Strong Lightweight Cellular Structures Using Polysaccharide-Based Composite Foams

2018 ◽  
Vol 6 (12) ◽  
pp. 17160-17167 ◽  
Author(s):  
Hugo P. Voisin ◽  
Korneliya Gordeyeva ◽  
Gilberto Siqueira ◽  
Michael K. Hausmann ◽  
André R. Studart ◽  
...  
Keyword(s):  
3D Printing ◽  
Cellular Structures ◽  
Composite Foams

scholarly journals Benefits of 3D printing technologies for aerospace lattice structures

2021 ◽  
Vol XXIV (1) ◽  
pp. 8-16
Author(s):  
VOICU Andrei - Daniel
Keyword(s):  
3D Printing ◽  
Cell Structure ◽  
Weight Ratio ◽  
High Strength ◽  
Cellular Structures ◽  
Lattice Structures ◽  
Mass Reduction ◽  
Aerospace Sector ◽  
Potential Applications ◽  
Remote Operations

The article makes a brief presentation of the latest 3D printing methods that are used for manufacturing aerospace lattice structures. Most 3D printing technologies are not fully deployed on the industrial scale of aerospace sector, but are rather used for rapid prototyping of components. One of the main potential applications is for them to offer a rapid solution for remote operations, where it is difficult to supply parts. Additive manufactured lattice structures are cellular structures based on biomimicry (inspired from nature lattice structures such as bones, metal crystallography, etc.), that possess many superior properties compared to solid materials and are ideal for fabricating aerospace structures mainly due to the mass reduction they introduce and the high strength-to-weight ratio. Their mechanical properties are defined by the infill percentage, the geometry of the cell structure and the material used in the manufacturing process.

Reconfigurable Compliant Cellular Material With Programmable Compliant Cellular Structure

2015 ◽  
Author(s):  
Ye Kang ◽  
Kwangwon Kim ◽  
Jaehyung Ju
Keyword(s):  
Thermal Expansion ◽  
3D Printing ◽  
Shape Memory ◽  
Thermal Expansion Coefficient ◽  
Expansion Coefficient ◽  
Smart Materials ◽  
Cellular Materials ◽  
Time Dependent ◽  
Cellular Structures ◽  
4D Printing

Cellular materials have two important properties: structures and mechanisms. This property enables one to design structures with proper stiffness and flexibility. Recent advance in 3D printing technologies enable engineers to manufacture complex cellular structures. In addition, use of smart materials, e.g., shape memory polymers (SMPs), for 3D printing enables us to construct mesostructures actively responsive to environmental stimuli with a programmable function, which may be termed ‘4D Printing’ referring to additional dimension on time-dependent shape change after 3D printing. The objective of this study is to design and synthesize active reconfigurable cellular materials, which enables the advance of technology on intelligent reconfigurable cellular structures with 4D printing. A two-layer hinge of a CPS functions through a programmed thermal expansion mismatch between two layers and shape memory effect of an SMP. Starting with thermo-mechanical constitutive modeling of a compliant porous hinge consisting of laminated elastomer composites, macroscopic behaviors of a reconfigurable compliant porous structure (CPS) will be constructed using the strain energy method. A finite element (FE) based simulation equipped with a user subroutine will be implemented with ABAQUS/Standard to simulate time-dependent thermo mechanical behaviors of a CPS. The designed CPS with polymers shows an extremely high negative Poisson’s ratio (∼ −120) and negative thermal expansion coefficient (−2,530 × 10−6/C). When programmed with an appropriate thermo-mechanical procedure, the hinge of the CPS bends either in positive and negative sign, which enables to tailor the CPS into desired intermediate and final configurations, ending up with achieving a reconfigurable CPS. This paper demonstrates that actively reconfigurable compliant cellular materials (CCMs) with CPSes can be used for next-generation materials design in terms of tailoring mechanical properties such as modulus, strength, yield strain, Poisson’s ratios and thermal expansion coefficient together with programmable characteristics.

scholarly journals Qualitative evaluation of the deformation process of regular cellular structures manufactured using 3D printing

Mechanik ◽  
2018 ◽  
Vol 91 (3) ◽  
pp. 250-252 ◽  
Author(s):  
Piotr Dziewit ◽  
Jacek Janiszewski
Keyword(s):  
3D Printing ◽  
Static Loading ◽  
Deformation Process ◽  
Qualitative Evaluation ◽  
Deformation Energy ◽  
Cellular Structures ◽  
Fused Deposition Modelling ◽  
Uniaxial Compression Test ◽  
Fused Deposition ◽  
Starting Point

Presented are selected experimental results concerning the analysis of the deformation process of regular cellular structures manufactured using 3D printing under quasi-static loading conditions. The various structural topologies were designed and manufactured using the FDM (fused deposition modelling) and then tested in a uniaxial compression test. The starting point for the development of individual variants of structures was the honeycomb topology. In order to analyse the influence of the structure material on the deformation process, the samples were made from three commercially available materials: PC-10, ABSplus and Nylon12. Based on the results, the influence of the shape of the single cell and the type of material used on the deformation of the structure as well as the value of the plastic deformation energy were assessed.

Lightweight Metal Cellular Structures Fabricated via 3D Printing of Sand Cast Molds

2015 ◽  
Vol 17 (7) ◽  
pp. 923-932 ◽  
Author(s):  
Dean Snelling ◽  
Qian Li ◽  
Nicolas Meisel ◽  
Christopher B. Williams ◽  
Romesh C. Batra ◽  
...  
Keyword(s):  
3D Printing ◽  
Cellular Structures ◽  
Sand Cast

scholarly journals Production and characterization of copper periodic open cellular structures made by 3D printing‐replica technique

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Riccardo Balzarotti ◽  
Alessandra Bisaccia ◽  
Maria Celeste Tripi ◽  
Matteo Ambrosetti ◽  
Gianpiero Groppi ◽  
...  
Keyword(s):  
3D Printing ◽  
Cellular Structures ◽  
Replica Technique

The 'well-known' theory of electron image formation

1983 ◽  
Vol 41 ◽  
pp. 288-289
Author(s):  
M.A. O'Keefe ◽  
W.O. Saxton
Keyword(s):  
Image Processing ◽  
Image Formation ◽  
Source Profiles ◽  
Electron Image

A recent paper by Kirkland on nonlinear electron image processing, referring to a relatively new textbook, highlights the persistence in the literature of calculations based on incomplete and/or incorrect models of electron imageing, notwithstanding the various papers which have recently pointed out the correct forms of the appropriate equations. Since at least part of the problem can be traced to underlying assumptions about the illumination coherence conditions, we attempt to clarify both the assumptions and the corresponding equations in this paper, illustrating the effects of an incorrect theory by means of images calculated in different ways.The first point to be made clear concerning the illumination coherence conditions is that (except for very thin specimens) it is insufficient simply to know the source profiles present, i.e. the ranges of different directions and energies (focus levels) present in the source; we must also know in general whether the various illumination components are coherent or incoherent with respect to one another.

Preparatory Procedures for Electron Microscopic Analysis at the Molecular Level of Resolution

1978 ◽  
Vol 36 (3) ◽  
pp. 516-520
Author(s):  
F.J. Sjostrand
Keyword(s):  
Electron Microscope ◽  
Molecular Level ◽  
Microscopic Analysis ◽  
Resolving Power ◽  
Cellular Structures ◽  
Electron Microscopic ◽  
Systematic Analysis ◽  
Technical Developments ◽  
Thin Sectioning ◽  
Obvious Reason

In the 1940's and 1950's electron microscopy conferences were attended with everybody interested in learning about the latest technical developments for one very obvious reason. There was the electron microscope with its outstanding performance but nobody could make very much use of it because we were lacking proper techniques to prepare biological specimens. The development of the thin sectioning technique with its perfectioning in 1952 changed the situation and systematic analysis of the structure of cells could now be pursued. Since then electron microscopists have in general become satisfied with the level of resolution at which cellular structures can be analyzed when applying this technique. There has been little interest in trying to push the limit of resolution closer to that determined by the resolving power of the electron microscope.

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