| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Phase Transformations in Ceramics: Science and Applications
|
| Presentation Title |
Useful Energy Dissipation and Fatigue Resistance in Cyclically Loaded Superelastic Ceramic Granular Packings |
| Author(s) |
Hunter Rauch, Joey Griffiths, David Garcia, Yan Chen, Ke An, Hang Yu |
| On-Site Speaker (Planned) |
Hunter Rauch |
| Abstract Scope |
Zirconia-based superelastic ceramics possessing a reversible martensitic transformation have large stress-strain hysteresis which can be a design tool when viewed as a sink for mechanical energy. These materials undergo large strains during transformation and are prone to brittle failure, so material forms with low mechanical constraint, like granular packings, are necessary. In granular form, superelastic ceramics exhibit a ‘continuous mode’ of transformation due to the heterogeneous nature of stress distribution in the packing. Combining the continuous mode transformation with the large hysteresis yields a promising candidate for mechanical energy dissipation, where even small applied loads can result in some degree of transformation. Here, we present the first study of cyclic transformation in granular packings of superelastic zirconia, including results from in situ neutron diffraction and mechanical testing. We explore the evolution of the energy dissipation behavior over 10,000 loading cycles and find that the packings are resistant to functional fatigue. |