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Seminar: In situ 3D observation of mechanical damage within SiC-SiC ceramic matrix composites for nuclear fuel clad

Image: Professor Thomas James Marrow
Professor Thomas James Marrow

Date: 23 November 2017   Time: 16:00 - 17:00

The seminar, entitled "In situ 3D observation of mechanical damage within SiC-SiC ceramic matrix composites for nuclear fuel clad," will be given by Professor Thomas James Marrow, from Oxford University.

To evaluate future materials for fuel cladding, it is important to characterize their mechanical properties and investigate the sensitivity of damage evolution to microstructure under representative states of loading and temperature. The evolution of defects at the microscale can be observed in situ under load by high-resolution X-ray computed tomography (?XCT), combined with digital volume correlation (DVC) analysis to measure the 3D displacement field. Such data may be used to validate high fidelity models that can simulate failure of microstructures under different states of loading. The SiC-SiCfibre material studied was provided by the EU 7th Framework programme MatISSe consortium, and is a candidate material for fuel cladding in the ALLEGRO Gas Fast Reactor. It is a tubular filament wound and braided composite of Hi-Nicalon S fiber with a pyrocarbon interphase and chemical vapor infiltrated (CVI) SiC matrix. High resolution synchrotron ?XCT on beamlines I12 and I13 of the UK Diamond Light Source observed the response of specimens to progressive loading at ambient temperature (hoop stress via internal pressurization) and also 900°C (diametral loading of C-rings). DVC analysis of successive tomographs measured the full field 3D displacements with high spatial resolution, from which a nominal strain field was obtained, as well as visualization of damage evolution with increasing applied strain.

Location:  Nanoforce Seminar room
Contact:  Dr Ana Belen Jorge Sobrido