| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Biological Materials Science
|
| Presentation Title |
Prestressing Bioceramics: On the Structural Origins and Mechanical Significance of Residual Stresses in Sea Urchin Spines |
| Author(s) |
Zhifei Deng, Zian Jia, Hyunchae Chad Loh, Admir Masic, Emily Peterman, Ling Li |
| On-Site Speaker (Planned) |
Zhifei Deng |
| Abstract Scope |
Introducing compressive residual stress is an effective strategy to improve the mechanical performance of brittle materials such as ceramics and glass. Here we report a bioceramic system which exhibits a macroscopic compressive residual stress field in sea urchin spines (Heterocentrotus mamillatus). The spines cut along the axial direction close the cut opening immediately, indicating a compressive residual stress near the outer surface. Strain gauge measurements further confirmed strain release up to 0.13%, and the peak shifts from piezo-Raman measurements on the spine before and after release also revealed a distributed residual stress field, tension in the center vs. compression near the surface. In addition, structural analysis revealed that from the spine center to edge, the Mg concentration increases, the intracrystalline organics and ACC decrease, and calcite lattice parameters decrease. Nanoindentation measurements showed that the compressive residual stress on the spine surface enhances the indentation modulus, hardness, and crack resistance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Biomaterials, Mechanical Properties, Other |