scholarly journals Carbon Fiber and Syntactic Foam Hybrid Materials via Core–Shell Material Extrusion Additive Manufacturing

2020 ◽  
Vol 5 (12) ◽  
pp. 2000731
Author(s):  
Robert C. Pack ◽  
Stian K. Romberg ◽  
Aly A. Badran ◽  
Nadim S. Hmeidat ◽  
Trenton Yount ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Carbon Fiber ◽  
Hybrid Materials ◽  
Syntactic Foam ◽  
Core Shell ◽  
Shell Material ◽  
Material Extrusion

Rheological investigation of nylon‐carbon fiber composites fabricated using material extrusion‐based additive manufacturing

2021 ◽  
Author(s):  
Arit Das ◽  
Martin Etemadi ◽  
Bradley A. Davis ◽  
Steven H. McKnight ◽  
Christopher B. Williams ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Carbon Fiber ◽  
Fiber Composites ◽  
Carbon Fiber Composites ◽  
Material Extrusion

scholarly journals Numerical Simulation of a Core–Shell Polymer Strand in Material Extrusion Additive Manufacturing

Polymers ◽  
2021 ◽  
Vol 13 (3) ◽  
pp. 476
Author(s):  
Hamid Narei ◽  
Maryam Fatehifar ◽  
Ashley Howard Malt ◽  
John Bissell ◽  
Mohammad Souri ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Velocity Ratio ◽  
Diameter Ratio ◽  
Core Material ◽  
Operating Parameters ◽  
Core Shell ◽  
Material Extrusion ◽  
The Core ◽  
3D Printed ◽  
Core Polymer

Material extrusion additive manufacturing (ME-AM) techniques have been recently introduced for core–shell polymer manufacturing. Using ME-AM for core–shell manufacturing offers improved mechanical properties and dimensional accuracy over conventional 3D-printed polymer. Operating parameters play an important role in forming the overall quality of the 3D-printed manufactured products. Here we use numerical simulations within the framework of computation fluid dynamics (CFD) to identify the best combination of operating parameters for the 3D printing of a core–shell polymer strand. The objectives of these CFD simulations are to find strands with an ultimate volume fraction of core polymer. At the same time, complete encapsulations are obtained for the core polymer inside the shell one. In this model, the deposition flow is controlled by three dimensionless parameters: (i) the diameter ratio of core material to the nozzle, d/D; (ii) the normalised gap between the extruder and the build plate, t/D; (iii) the velocity ratio of the moving build plate to the average velocity inside the nozzle, V/U. Numerical results of the deposited strands’ cross-sections demonstrate the effects of controlling parameters on the encapsulation of the core material inside the shell and the shape and size of the strand. Overall we find that the best operating parameters are a diameter ratio of d/D=0.7, a normalised gap of t/D=1, and a velocity ratio of V/U=1.

scholarly journals Carbon Fiber Reinforced Multi-Phase Epoxy Syntactic Foam (CFR-Epoxy-Hardener/HGMS/Aerogel-R-Hollow Epoxy Macrosphere(AR-HEMS))

Polymers ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 683
Author(s):  
Xinfeng Wu ◽  
Yuan Gao ◽  
Tao Jiang ◽  
Ying Wang ◽  
Ke Yang ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Deep Sea ◽  
Impact Resistance ◽  
Syntactic Foam ◽  
Low Density ◽  
Expandable Polystyrene ◽  
Two Factors ◽  
Inner Diameter ◽  
Multi Phase

Because the aerogel has ultra-low density and good impact resistance, the aerogel material, epoxy-hardener system, and expandable polystyrene beads (EPS) were used to prepare the lightweight aerogel reinforced hollow epoxy macro-spheres (AR-HEMS). The multi-phase epoxy syntactic foam (ESF) was manufactured with the epoxy-hardener system, HGMS (EP-hardener-HGMS), and AR-HEMS by “the compression modeling method.” In this experiment, in order to enhance the strength of the ESF, some different kinds of the carbon fiber (CF) were added into the EP-hardener-HGMS system (CFR-EP). The influence of the volume stacking fraction, inner diameter, and layer of the AR-HEMS and the content and type of the CF in the EP-HGMS (CFR-EP) system on the compressive strength of the ESF were studied. Weighing the two factors of the density and compressive strength, the ESF reinforced by 1.5 wt% CF with 90% AR-HEMS has the better performance. This kind of the ESF has 0.428 g/cm3 nd 20.76 Mpa, which could be applied in 2076 m deep sea.

Preparing and Applying of Flame Retardant Microcapsules Containing Magnesium Hydroxide

2013 ◽  
Vol 734-737 ◽  
pp. 2191-2194
Author(s):  
Li Li Wu ◽  
Yuan Lian ◽  
Dan Liu ◽  
Hua Zheng ◽  
Dian Wu Huang
Keyword(s):  
Thermal Stability ◽  
Flame Retardant ◽  
Magnesium Hydroxide ◽  
Low Density Polyethylene ◽  
Core Shell ◽  
Low Density ◽  
Melamine Resin ◽  
Shell Material ◽  
Elongation At Break ◽  
Good Thermal Stability

In this study, flame retardant microcapsules were synthesized using magnesium hydroxide as core materials, melamine resin as the shell material. The structure, diameters and thermal properties of prepared microcapsules were investigated by using FTIR, ELS, DSC and TGA. The effects of core/shell ratio on the properties of microcapsules were studied.Flame retardant materials of low-density polyethylene/magnesium hydroxide microcapsules were prepared.The tensile strength and elongation at break tests were performed to determine its mechanical property.Inflammability of the materials was also studied.The results showed the prepared magnesium hydroxide microcapsule shows good thermal stability and it has free compatibility with the polymer.The composites of HDPE/MH microcapsules have good performance．

Additive Manufacturing Using Continuous Carbon Fiber

2021 ◽  
Vol 39 (4) ◽  
pp. 314-317
Author(s):  
Yasuhisa Hirata ◽  
Kohei Yamamoto
Keyword(s):  
Additive Manufacturing ◽  
Carbon Fiber ◽  
Continuous Carbon Fiber
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