| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Lamellar Structure of High-Strength Direct-Spun CNT Yarns |
| Author(s) |
Ibrahim Guven, Mark Lauer, Carl Mayer |
| On-Site Speaker (Planned) |
Ibrahim Guven |
| Abstract Scope |
Several macro-scale applications utilizing carbon nanotubes (CNTs) as the main structural component have emerged recently. These structures possess multi-scale hierarchical nano- and micro-scale components. The macro-scale mechanical properties of a CNT-based composite are directly affected by how the hierarchical components interact and their ability to transfer loads effectively. While many of these components (CNTs, bundles, graphene sheets) have been known, one feature specific to directly spun CNT yarns, lamellae, appears to have not yet been identified in the literature. Optimization of each length scale feature towards maximization of the target properties depends on understanding the behavior and interactions of these multi-scale features in their entire spectrum.
One of the most essential properties in fiber-reinforced polymer composites is the interfacial shear strength (IFSS) between the fibers and the resin, for which the single fiber pullout test is used for characterization. Due to the relatively inferior mechanical performance in the transverse directions within the yarns and the difficulty penetrating resin into the yarn, a premature sword in sheath-type failure within the yarn is observed.
This work presents a detailed experimental characterization of high-strength CNT yarn. Nanoscale X-ray computed tomography and FIB/SEM imaging were applied to reveal prominent lamella structures. This previously unreported feature provides the basis for the hypothesis addressing the sword in sheath type failures. Additionally, several experiments were computationally simulated using peridynamics. The model predictions of failure modes were consistent with the pullout experiment observations. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |