Title: EFFECT OF STRETCH RATIO AND NIP FORCE ON THE GENERATION OF STRETCH BROKEN CARBON FIBER
Authors: Riad Morshed Rezaul, Cecily Ryan, Douglas Cairns
Abstract: Carbon fiber is a highly desirable material in the aerospace industry due to its excellent strength and stiffness. Stretch broken carbon fiber (SBCF) is a type of discontinuous carbon fiber which is generated by stretch breaking the fibers at their natural flaws. The discontinuous nature of SBCF allows it to be formed into complex shaped geometries more favorably as compared to its continuous counterpart. A polymeric coating known as sizing is applied to SBCF to enhance handleability, back-tension ability and formability. The objective of this work is to investigate the effect of stretch ratio and nip force to optimize SBCF generation in terms of sizing deposition on tow, unit mass of tow, fiber length distribution, tow handleability, back-tension ability, and tow formability. During stretch breaking, the stretch ratio was changed by changing the differential speed between the two stretch break rollers. Another process variable, the nip force, was changed by changing the force applied by the polyurethane nip rollers. Our preliminary results suggest that stretch ratio of 20% and 25% and nip force regime of 9786 N-10676 N yielded SBCF with reliable and consistent material properties.
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Conference: SAMPE 2023
Publication Date: 2023/04/17
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