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Combining Chopped Carbon Fiber with ABS Has Surprising Effect on 3D Printed Parts http://bit.ly/2ER2nC6 In a paper entitled “Determining the Effect of Yield Strength of Acrylonitrile Butadiene Styrene through the inclusion of Chopped Carbon Fibre,” author Owen M. Cannings of the University of New South Wales at the Australian Defence Force Academy discusses potentially increasing the yield strength of 3D printed ABS parts by adding chopped carbon fiber. While carbon fiber is a common form of reinforcement in 3D printing materials, it usually comes in the form of continuous fibers throughout the material. The author aims to find out if chopped bits of carbon fiber can have the same effect. First Cannings tested samples of plain ABS and ABS reinforced with chopped carbon fiber. The carbon fiber-reinforced sample experienced more deformation than the regular ABS sample, which suggests that the CF-ABS material is more ductile. He also tested the yield stress of 3D printed samples of both materials. The yield strength of the 3D printed parts was lower than that of the unprocessed filament, suggesting that the printed parts may have some voids or defects within them.
Cannings attempted to contact the company responsible for the manufacture of the filament, but received no response.
This could be a major factor that affects the difference in strength between the ABS and carbon fiber-reinforced ABS samples. Future work, the author suggests, should focus on a proper mixing procedure and modification of the carbon fiber geometry. It is rather surprising that the parts 3D printed from plain ABS achieved higher yield strength values when compared to those 3D printed from carbon fiber-reinforced ABS. The inclusion of chopped carbon fiber particles within the ABS resulted in a reduction of between 13 and 29 percent tensile strength. More research needs to be conducted to determine the reason for this, but an initial estimate suggests that the bonding between the carbon fiber particles and the ABS plastic results in a weaker material. Many operators buy CF filament in the hope that it outperforms regular filament. For many cases, we already know that the increased costs are not worth it at all for most users in most applications. Most carbon fiber filament is nonfunctional and silly. This is a useful piece of research that backs this up. We’re also grateful that amidst an endless stream of positive research results it is nice to have a negative result as well! Discuss this and other 3D printing topics at 3DPrintBoard.com or share your thoughts below.
Printing via 3DPrint.com | The Voice of 3D Printing / Additive Manufacturing https://3dprint.com December 26, 2018 at 11:49AM
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