Improved constitutive description of single crystal viscoplastic deformation by dislocation climb
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Bibliographic record
Abstract
This article presents a continuum-level constitutive model of a single crystal deforming by dislocation climb, accounting for crystallography and dislocation/point-defect interactions. The proposed constitutive description represents an improvement over a previous recent model, which extended the rate-sensitivity approach for single crystal plasticity by dislocation glide to consider the deformation geometry of dislocation climb under the assumption of instantaneous restoration of equilibrium concentration of vacancies near climbing dislocations. The key element of the new model is a chemical stress parameter, which represents the additional driving force on climbing dislocations due the excess vacancy concentration. The original and new versions of the crystallographic model of climb are compared through a simple example of a strongly anisotropic single crystal that illustrates the differences in response due to the consideration or not of the chemical driving force for climb.
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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 | 0.001 |
| 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 it