scholarly journals Laser-Assisted 3D Printing of Functional Graded Structures from Polymer Covered Nanocomposites: A Self-Review

10.5772/63565 ◽  
2016 ◽  
Author(s):  
Igor Volyanskii ◽  
Igor V. Shishkovsky
Keyword(s):  
3D Printing ◽  
Graded Structures

Hierarchical chemomechanical encoding of multi-responsive hydrogel actuators via 3D printing

2019 ◽  
Vol 7 (25) ◽  
pp. 15395-15403 ◽  
Author(s):  
Jérémy Odent ◽  
Sophie Vanderstappen ◽  
Antoniya Toncheva ◽  
Enzo Pichon ◽  
Thomas J. Wallin ◽  
...  
Keyword(s):  
3D Printing ◽  
Environmental Change ◽  
Functionally Graded ◽  
Swelling Behavior ◽  
Controllable Motion ◽  
Graded Structures ◽  
Functionally Graded Structures

A family of multi-responsive hydrogel-based actuators capable of rapid and controllable motion in response to any immediate environmental change is herein demonstrated towards the 3D-printing of functionally graded structures that are encoded with anisotropic swelling behavior.

Free and Forced Vibration Characteristics of Axially Graded Multifunctional Viscoelastic Beams

2017 ◽  
Author(s):  
Mariona Heras Segura ◽  
Kumar Vikram Singh ◽  
Fazeel Khan
Keyword(s):  
Additive Manufacturing ◽  
3D Printing ◽  
Material Properties ◽  
Forced Vibration ◽  
Composite Structures ◽  
Spectral Characteristics ◽  
Polymeric Materials ◽  
Vibration Characteristics ◽  
Spatially Varying ◽  
Graded Structures

Variable performance characteristics in a multifunctional structure may be achieved by identifying suitable material candidates, and spatially varying, or grading, their material properties along the structures. Additive manufacturing (e.g. 3D printing) offers various possibilities to fabricate/manufacture such graded structures. The material properties of multifunctional composite structures, such as beams or plates, are often graded along their thickness (laminate/sandwich) or distributed in a material matrix (fibers/nanoparticles). In recent years, it has been demonstrated that by tailoring the materials in other directions (axially/radially), superior mechanical behavior and structural stability can be realized. In this research, the modeling and analyses of axially graded polymeric beams to maximize their vibration performance for a large bandwidth of frequencies and damping is presented. Polymeric materials have frequency and temperature dependent viscoelastic properties (complex modulus, glass transition temperature etc.) which can be leveraged for different applications. The goal is to spatially combine these materials such that desired longitudinal vibration characteristics (natural frequencies, damping and modes) can be achieved. To this end, the modeling for the free and forced vibration of beams with spatially varying properties, is carried out by a piecewise uniform continuous model. The spectral characteristics (natural frequency, damping ratios, and frequency response functions) of the axially graded beams are computed by solving associated transcendental eigenvalues problems. The parametric studies included the grading of polymers which are regularly used for additive manufacturing, such as ABS, PLA, etc. These results demonstrate that the response of the system can be manipulated by axial grading and optimal design/fabrication (3D printing) of multifunctional smart structures may be developed for vibration control applications.

3D Printing of Plain and Gradient Cermets with Efficient Use of Raw Materials

2019 ◽  
Vol 799 ◽  
pp. 239-245 ◽  
Author(s):  
Maksim Antonov ◽  
Roman Ivanov ◽  
Yaroslav Holovenko ◽  
Dmitri Goljandin ◽  
Ramin Rahmaniahranjani ◽  
...  
Keyword(s):  
3D Printing ◽  
Raw Materials ◽  
Selective Laser Sintering ◽  
Functionally Graded ◽  
High Wear Resistance ◽  
Hard Materials ◽  
Plastic Materials ◽  
Improved Performance ◽  
Geothermal Drilling ◽  
Graded Structures

3D printing of plastic materials is very popular nowadays, while printing of wear resistant hard materials is still an issue. Gradient or functionally graded structures are providing improved performance in impact-abrasive application (tunnelling, geothermal drilling, mining, etc.) through the optimal positioning of areas providing high wear resistance and high resistance against impacts. However, printing of such structures by widely used powder bed selective laser sintering leads to the high consumption of raw materials (powders) that cannot be used again for next printing. A method to overcome this problem is explored in current work. The cermets were produced from following powders: (1) commercial, (2) obtained by disintegration of cutting tool inserts (recycled) and (3) reused recycled ones. Tungsten and cobalt used for the production of the majority of cermets are critical raw materials and their consumption should be reduced while the rate of recycling needs to be increased. The surfaces were studied with the help of optical microscopy, scanning electron microscopy, and energy-dispersive spectroscopy. The hardness and wear rate of samples in abrasive conditions were measured.

Michael Pawlyn: Push the limits of 3D printing

Nature ◽  
2013 ◽  
Vol 494 (7436) ◽  
pp. 174-174 ◽  
Author(s):  
Michael Pawlyn
Keyword(s):  
3D Printing

High-resolution 3D printing in seconds

Nature ◽  
2020 ◽  
Vol 588 (7839) ◽  
pp. 594-595
Author(s):  
Cameron Darkes-Burkey ◽  
Robert F. Shepherd
Keyword(s):  
High Resolution ◽  
3D Printing

3D Printing for Development in the Global South

2014 ◽  
Author(s):  
Thomas Birtchnell ◽  
William Hoyle
Keyword(s):  
3D Printing ◽  
Global South
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