Understanding structural anisotropy and mechanical properties of Na-montmorillonite with crystalline swelling and uniaxial deformation under different hydration degrees
Bibliographic record
Abstract
Montmorillonite (MMT) is the main component of bentonite and its mechanical behaviour is sensitive to hydration degrees and structural anisotropy. In this study, molecular dynamics (MD) simulations were used to investigate the atomic structures and fracture behaviour of Na-MMT. The different deformation scenarios are applied to the Na-MMT with different hydration levels within the crystalline swelling phase of hydration. It is found that the mechanical behaviour of Na-MMT is significantly influenced by interlayer hydration degree and structural anisotropy. For example, the ultimate tensile strength and Young's modulus of Na-MMT exhibit decreasing trends with increasing hydration degrees. When tensile strain is applied along the two in-plane directions of the MMT layer, the fracture is observed in the silica-oxygen octahedra. The increase in hydration degree also raises the interlayer potential energy of the clay plate and reduces its stability. Meanwhile, buckling behaviour is observed under compression. These findings provide important insights into the origin of Na-MMT anisotropy, elucidating the complex interplay between the degree of hydration, structural anisotropy, and uniaxial deformation of Na-MMT. This work also provides key scientific insights for future studies of temperature effects, interlayer cation, and other mechanical responses.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".