Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test
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| Main Authors: | , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866915556471341056 |
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| author | Preuß, Oliver Li, Zhangtao Bruder, Enrico Carrez, Philippe Cui, Yinan Rödel, Jürgen Fang, Xufei |
| author_facet | Preuß, Oliver Li, Zhangtao Bruder, Enrico Carrez, Philippe Cui, Yinan Rödel, Jürgen Fang, Xufei |
| contents | Understanding crack tip - dislocation interaction is critical for improving the fracture resistance of semi-brittle materials like room-temperature plastically deformable ceramics. Here, we use a modified double cleavage drilled compression (DCDC) specimen geometry, which facilitates stable crack propagation, to achieve in situ observation of crack tip - dislocation interaction. MgO specimens, furnished with dislocation-rich barriers, were employed to study how dislocations influence crack propagation. Crack progression was clearly observed to decelerate within dislocation-rich regions, slowing to 15% of its velocity as compared to the pristine crystal. Upon exiting these regions, cracks reaccelerated until reaching the next dislocation-rich barrier. Coupled phase field and crystal plasticity modeling replicates the experimental observations and provides mechanistic insight into crack tip - dislocation interactions. The aligned experiment and simulation results underscore the robustness of the technique and its potential to inform the design of more fracture-resistant ceramics via dislocations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_11965 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test Preuß, Oliver Li, Zhangtao Bruder, Enrico Carrez, Philippe Cui, Yinan Rödel, Jürgen Fang, Xufei Materials Science Understanding crack tip - dislocation interaction is critical for improving the fracture resistance of semi-brittle materials like room-temperature plastically deformable ceramics. Here, we use a modified double cleavage drilled compression (DCDC) specimen geometry, which facilitates stable crack propagation, to achieve in situ observation of crack tip - dislocation interaction. MgO specimens, furnished with dislocation-rich barriers, were employed to study how dislocations influence crack propagation. Crack progression was clearly observed to decelerate within dislocation-rich regions, slowing to 15% of its velocity as compared to the pristine crystal. Upon exiting these regions, cracks reaccelerated until reaching the next dislocation-rich barrier. Coupled phase field and crystal plasticity modeling replicates the experimental observations and provides mechanistic insight into crack tip - dislocation interactions. The aligned experiment and simulation results underscore the robustness of the technique and its potential to inform the design of more fracture-resistant ceramics via dislocations. |
| title | Stable crack propagation in dislocation-engineered oxide visualized by double cleavage drilled compression test |
| topic | Materials Science |
| url | https://arxiv.org/abs/2508.11965 |