Nonlinear Behavior of IM7 Carbon Fibers in Compression Leads to Bending Nonlinearity of High-Strain Composites
This paper presents an experimental characterization of carbon fibers under compression and the influence of their nonlinear behavior on the bending nonlinearity of high-strain composites (HSC). The study is focused on HexTow IM7, a pan-based carbon fiber compressed under in-situ scanning electron microscopic (SEM) imaging. The sample preparation and experimental procedure of both single fiber direct compression tests and column bending tests of HSC samples are presented. Nonlinearity at the individual fiber level could not be observed due to the limitations of the load cell in the single fiber direct compression experiment. Using the column bending tests, a shift in the neutral axis due to the nonlinear compression behavior of fibers is observed.
© 2023 by Uba K Ubamanyu and Sergio Pellegrino. The authors acknowledge financial support from the Space Solar Power Project at Caltech. The authors are grateful for the help of Rebecca Gallivan, Widianto Moestopo, Thomas Tran, and Wenxin Zhang with single fiber direct compression experiments, and Professor Julia Greer for providing access to her experimental facilities and Alexander Wen for helpful discussions and suggestions. Test materials for this study were provided by Patz Materials & Technology.
Accepted Version - 2023_Nonlinear_behavior_of_IM7_carbon_fibers_Scitech.pdf
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