Effect of fiber bending induced matrix shear behavior on machined surface quality in carbon fiber reinforced plastic milling. (1st May 2022)

• Record Type: Journal Article
• Authors: Kim, Gyuho; Song, Kyeongeun; Jun, Martin Byung-Guk; Jeong, Young Hun; Kim, Tae-Gon; Min, Byung-Kwon
• Is Part Of: Composite structures. Volume 287(2022)
• Publication Date: 2022-05-01
• Subjects: Fiber bending -- fiber-matrix debonding -- Fiber pull-out -- Surface roughness; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2022.115343
• Languages: English
• ISSNs: 0263-8223

Abstract

Highlights: Matrix shear behavior is found to affect milled CFRP surface quality. Shear strain energy of the whole matrix deformed by a milling tool was calculated. The geometrical relationship between fibers and a cutter was used in the model. Ra and Rz of the machined surface were proportional to the calculated energy. Abstract: Fiber bending by the cutting tool is one of the dominant causes of fiber pull-out on machined surfaces during CFRP milling. During the bending, the polymer matrix between the fibers is subjected to shear stress resulting in fiber-matrix debonding. The increase in the debonding length causes an increase in the fiber pull-out length. In milling, not all the new surfaces created by tool-workpiece engagement become the machined surface. However, during this process, the strain energy absorbed by the deformed matrix is released into fiber-matrix debonding along the fibers which can cause fiber pull-out on the machined surface. In this study, shear strain energy of polymer matrix due to fiber bending during milling tool-workpiece engagement was calculated with the geometrical relationship between fibers and a cutting edge. We found that the increase in Ra and Rz of the machined surface had clear tendencies to the increase in the calculated energy.