About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Ceramics and Ceramic-Based Composites for Nuclear Applications III
|
| Presentation Title |
Some thoughts on the ‘linear inelastic’ behaviour of nuclear graphite |
| Author(s) |
Dong (Lilly) Liu, Ming Jiang |
| On-Site Speaker (Planned) |
Dong (Lilly) Liu |
| Abstract Scope |
When a bulk sample of nuclear graphite is loaded in tension, bending or Brazilian disc compression, the load-displacement curves often show a linear trend approximately beyond 70%-90% failure load. Elastic crystalline lattice strains measured by in situ neutron/X-ray diffractions shows linear increase to about 30-40% of the failure load. This is then followed by a plateau where the crystalline lattice strains cease to increase, i.e., the ‘true’ elastic deformation only occurs up to 30-40% of the bulk failure load. Beyond this range, even though the bulk load-displacement/stress-strain curves appeared as linear, ‘inelastic’ mechanisms must have been activated in the bulk graphite material; hence this phenomenon in nuclear graphite is termed as ‘linear inelastic’ behaviour here. Based on our own data collected over the last 12 years as well as literature work, a deformation model for nuclear graphite will be presented. The impact of stress state on this will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Mechanical Properties, Nuclear Materials |