|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||Small Scale Mechanical Testing of Ceramic Interfaces in Nuclear Materials: Characterizing the Impact of Elastic Mismatch on Stress Intensity and Property Extraction
||Joseph R. Kabel, Peter Hosemann
|On-Site Speaker (Planned)
||Joseph R. Kabel
SiC/SiC composites have gained significant attention as an accident tolerant fuel cladding for nuclear reactors to improve safety and efficiency. Component functionality depends on interfacial performance; from weak PyC at the fiber/matrix interface for toughness, to strong bonding of the environmental barrier coating to prevent corrosion and fission product release. Small scale mechanical testing has been used to probe the relevant interface properties, often applying simplified analytical analyses for strength values. However, bi-material interfaces with elastic mismatch are known to evolve a stress intensity at the free surface. Numerical analyses were applied to capture the bi-material stress intensity factor for micro-pillar and -cantilever testing. An experimental case study on SiC/PyC/SiC micro-pillars shows a shear strength dependence on PyC thickness; however, the numerical analysis reveals that increased thickness reduces the stress intensity, ultimately normalizing the failure strength property. Similarly, the stress evolution in micro-cantilevers containing SiC/Cr and SiC/CrN interfaces is presented.