| 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 |
On the Applicability of Transverse Loading Experimental Method for Determining Tensile Strength of Single Carbon Fibers at Microscale Gage-Lengths |
| Author(s) |
Karan Shah, Sockalingam Subramani |
| On-Site Speaker (Planned) |
Karan Shah |
| Abstract Scope |
High performance carbon fibers are widely used as reinforcements in composite material systems for aerospace, automotive, and defense applications. Single fiber testing at millimeter-scale is typically used to characterize the fiber tensile strength. However, the longitudinal tensile failure of composite systems is governed by a cluster of single fiber failures occurring at microscale lengths on the order of few microns to a few hundred microns. It is challenging to experimentally measure tensile strength of single carbon fiber at such microscale gage-lengths. Typically, single fiber strength data at millimeter scale is extrapolated via Weibull weakest link statistics to determine fiber strength at microscale, often resulting in an overprediction. In this study, a transverse loading experimental technique using indenters of varying tip radii, R, is employed to access and test single fiber over microscale gage-lengths. The microscale gage-lengths are induced as the length of axial stress concentration on the outside surface of the fiber at the fiber-indenter contact region. Four different indenter geometries with tip radii, R, in the range of 10 µm < R < 2 mm are investigated for transverse loading at starting angles of 0°, 10°, and 25° to induce axial stress concentrations on the outside of the fiber over microscale gage-lengths. Failed fiber ends are collected and examined in SEM to gain insights on fiber failure and failure location for various indenter/starting angle combinations. Finite element simulations are performed to estimate the magnitude and length of the induced axial stress concentrations to determine fiber strength at microscale gage-lengths. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |