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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.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Characterizing Environment-dependent Fracture Mechanisms of SiC-SiC CMCs via Novel Four-point Bend / Hermeticity Test Frame
In Situ Observation of Crack Formation in CMCs Using X-ray Computed Tomography up to 1200°C
Mechanically-robust, Oxidation-resistant, Thermally-cyclable Oxide/Metal Composites for Concentrated Solar Power
Processing and Characterization of Al /Al2O3 Metal Matrix Composites Produced Using Magnetic Field-Assisted Freeze Casting of Porous Ceramic Structures
Properties of Thermally Grown Borosilicate Glasses and Their Impact on CMC Oxidation and Life Prediction
Quantifying Damage Mechanisms by Observing Damage Evolution in SiC/SiC Composites using Micro-CT Techniques
Size-dependent Toughness and Strength in Defective SiC and Diamond Nanowires

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