About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Biological Materials Science
|
| Presentation Title |
Anisotropic toughening mechanisms in osteonal bone |
| Author(s) |
Dingchuan Xue, Chenxu Yue, Jing Du, Sulin Zhang |
| On-Site Speaker (Planned) |
Dingchuan Xue |
| Abstract Scope |
Bone, incorporating high quality both in stiffness and toughness, has a complex hierarchical microstructure at many dimensional scales. By integrating simulations and experiments, we investigate the fracture behaviors of osteons, highlighting anisotropy as a critical toughening mechanism. We developed an anisotropic phase-field fracture model which incorporates fibril nanostructures to predict the anisotropic elasticity of fibers. While anisotropic elasticity reduces crack driving force, it has minor influences on crack tilting. In contrast, anisotropic fracture energy substantially enhances toughness. Zigzag crack patterns in osteon originate from the periodically rotational alignment of fibers, characteristics of a Bouligand structure, and fracture is also influenced by inhomogeneity resulting from the gradients in modulus and fracture energy. Our results further identify a transition from trans-lamellar to inter-lamellar fracture, with the latter being less stable and more susceptible to failure. Our findings highlight the importance of anisotropy in bone toughening, providing design guidance for advanced materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Biomaterials, Computational Materials Science & Engineering, Mechanical Properties |