| 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 |
Longitudinal Debonding of Single-Fibre Composites Observed via In-Situ Synchrotron Computed Tomography at a 150 nm Resolution |
| Author(s) |
Thanasis Chatziathanasiou, Sina AhmadvashAghbash, Babak Fazlali, Martin Diehl, Christian Breite, Mahoor Mehdikhani, Yentl Swolfs |
| On-Site Speaker (Planned) |
Yentl Swolfs |
| Abstract Scope |
Single-fibre composites are often used to characterise interfacial debonding in composites and to feed micromechanical calculations with values for interfacial shear strength and toughness. Fibre breaks and interfacial debonding in such experiments are usually monitored with optical microscopy, sometimes in combination with polarised light. Here, we report the results of a fragmentation test on single carbon and glass fibre-epoxy composites loaded in situ while scanned with computed tomography. The experiments were performed at the ID16B beamline of the European Synchrotron Radiation Facility, yielding a voxel size of 150 nm. The use of holotomography enabled us to visualise the mode II debonds in 3D even though such cracks do not have significant openings. This study is the first to achieve this to the best of our knowledge.
The obtained 3D images of fibre debonding reveal that it is significantly more complex than traditionally assumed or predicted by micromechanical simulations. The debond does not fully encompass the fibre perimeter but has a more complicated shape. This characteristic was seen for both carbon and glass fibres. We could also observe debond growth in successive load steps, up to 99% of the ultimate tensile strength. Moreover, these observations provide unique insights into the matrix crack around the fibre break. The new understanding we gained will enable future improvements to composite strength prediction models – a crucial first step for multiscale simulations. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |