A Methodology to Determine the Viscoplastic Perzyna Model Parameters for Granular Materials under High Strain Rates
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Bibliographic record
Abstract
Although Perzyna’s theory of viscoplasticity has been accepted and used widely, there is no proper and unified method to determine this model’s parameters for granular materials such as sand under high strain rate conditions. To study these parameters, both static and dynamic tests have been conducted on Ottawa sand. The method used to determine the physical behavior of sand at high strain rates was the split Hopkinson pressure bar (SHPB) method. Experimental stress-strain results from granular soils ranging from strain rates of 200 s-1 to 2100 s-1 are presented in this paper. The constitutive equations are calibrated against the experimental data using the Marquardt-Levenberg nonlinear optimization algorithm.
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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 | 0.001 | 0.001 |
| 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 it