|About this Abstract
||MS&T23: Materials Science & Technology
||Recent Developments in Light-Weight Composites and Materials
||Unprecedented Sensing of the Twisting in Fiber Tows, as Shown for Carbon Fiber by Inductance-based Self-sensing, which Provides Fast, Low-cost and Large-format Sensing
||Deborah D.L. Chung, Min Kyoung Kim
|On-Site Speaker (Planned)
||Deborah D.L. Chung
Twisting has long been imposed on fiber tows to improve the handleability/processability, as needed for manufacturing fiber products, including composites. The determination of the degree of twisting has been performed by visual inspection. This work provides for the first time a method of sensing the twisting (shown for up to 4 twists/inch). This method involves measuring the inductance (2 kHz), which increases with twisting, due to Faraday’s Law. Uncoated and nickel-coated carbon fiber tows (PAN-based, 12K) give similar fractional increases in the inductance (up to 20%), though nickel is magnetic and carbon is not. The resistance decreases with twisting (up to 14% and 4% decrease for uncoated and nickel-coated carbon fibers, respectively), due to the increasing fiber-fiber contact and presence of defects. Because of the conductivity, the tow is an inductor, with magnetic character not required. The inductance-based twist sensitivity decreases with increasing twisting, with high sensitivity below 1 twist/inch.