vietu.over-blog.com/
20 Février 2021
Article by Julie StewartPhotos by courtesy of Kun FuJuly 17, 2020
Nintendo wii u animal crossing new leaf. In 2019, ExOne, for example, introduced the new X1 160PRO™ metal 3D Printer for high-volume production, slated for late 2020 commercial availability. In a similar vein, Desktop Metal released its latest Shop System, a machine shop-friendly version of its Production System.
What do airplanes, bridges, and wind turbines have in common? They can all be made from lightweight, strong, composite materials made of polymers reinforced with strong carbon fibers.
Fiber-reinforced polymer composites have many useful properties, but their big drawback is they are typically complex and expensive to manufacture. In recent years, three-dimensional (3D) printing of composites has been successfully demonstrated using thermoplastic polymers and discontinuous fillers, but the resulting 3D-printed composites often have poor mechanical properties and low service temperature due to the limitations of the constituent properties. Consequently, 3D printing of composites using continuous carbon fibers and thermosetting polymers is expected to offer exceptional mechanical properties and thermal stability as well as featured design flexibility, low cost, reliability, and repeatability. However, no additive manufacturing technique has ever been reported to process continuous carbon fibers and thermosetting polymers for direct 3D printing of the finished composite.
Now, a team of engineers from the University of Delaware has developed a 3D printing technology that enables low-cost, flexible production of items made of fiber-reinforced polymer composites using continuous carbon fibers and thermosetting polymers. Their results were recently published in the journal Matter.
'This is believed to be the first time anyone has achieved such 3D printing of continuous carbon fiber and thermosetting composite,' said Kun (Kelvin) Fu, an assistant professor of mechanical engineering at the University of Delaware, the corresponding author of this work. Kun (Kelvin) Fu runs a Composite and Additive Manufacturing Lab at University of Delaware, and his lab is focusing on additive manufacturing and processing of materials, structures, and devices across multiple length scales for applications in energy, environment, and health.
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