About this Abstract |
Meeting |
Materials Science & Technology 2020
|
Symposium
|
Ceramic Matrix Composites
|
Presentation Title |
Quantifying Damage Mechanisms by Observing Damage Evolution in SiC/SiC Composites using Micro-CT Techniques |
Author(s) |
Ashley M. Hilmas, Kathleen Sevener, John Halloran |
On-Site Speaker (Planned) |
Ashley M. Hilmas |
Abstract Scope |
In-situ mechanical testing of unidirectional and cross-ply SiC/SiC composites was performed at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory. Composite samples were loaded at room temperature and imaged at incremental loads through fracture. The tomography images were used to observe the damage evolution throughout the volume of the specimens and quantify damage such as the onset of matrix cracking, subsequent matrix cracking and fiber fragmentation that occurred at each imaged stress increment. The damage was compared to well-known mechanical models and parameters such as debond length, onset of matrix cracking, and matrix crack spacing were evaluated. Comparisons were also made between the damage evolution observed in the unidirectional specimens and the cross-ply specimens. |