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Open AccessFeature PaperArticle
Materials 2016, 9(10), 828;

Characterization and Effects of Fiber Pull-Outs in Hole Quality of Carbon Fiber Reinforced Plastics Composite

Tube Specialties Company, Troutdale, OR 97060, USA
School of Engineering and Computer Science, Washington State University, Vancouver, WA 98686, USA
Author to whom correspondence should be addressed.
Academic Editor: Redouane Zitoune
Received: 13 July 2016 / Revised: 13 September 2016 / Accepted: 29 September 2016 / Published: 13 October 2016
(This article belongs to the Special Issue Machining of Composites and Multi-Stacks of Aerospace Materials)
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Hole quality plays a crucial role in the production of close-tolerance holes utilized in aircraft assembly. Through drilling experiments of carbon fiber-reinforced plastic composites (CFRP), this study investigates the impact of varying drilling feed and speed conditions on fiber pull-out geometries and resulting hole quality parameters. For this study, hole quality parameters include hole size variance, hole roundness, and surface roughness. Fiber pull-out geometries are quantified by using scanning electron microscope (SEM) images of the mechanically-sectioned CFRP-machined holes, to measure pull-out length and depth. Fiber pull-out geometries and the hole quality parameter results are dependent on the drilling feed and spindle speed condition, which determines the forces and undeformed chip thickness during the process. Fiber pull-out geometries influence surface roughness parameters from a surface profilometer, while their effect on other hole quality parameters obtained from a coordinate measuring machine is minimal. View Full-Text
Keywords: carbon fiber reinforced plastic (CFRP); drilling; fiber pull-out; hole quality carbon fiber reinforced plastic (CFRP); drilling; fiber pull-out; hole quality

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Alizadeh Ashrafi, S.; Miller, P.W.; Wandro, K.M.; Kim, D. Characterization and Effects of Fiber Pull-Outs in Hole Quality of Carbon Fiber Reinforced Plastics Composite. Materials 2016, 9, 828.

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