Effect of temperature and strain rate on the constitutive behaviour of oriented polypropylene tubes
Why this work is in the frame
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Bibliographic record
Abstract
The lighter weight of thermoplastics compared with metals make these materials an attractive alternative for automotive structural components. In particular, oriented thermoplastic tubes, typically uniaxially or biaxially oriented by an extrusion process, possess increased strength along the orientation directions. In addition to their good strength, the ductility of these materials, when formed at elevated temperatures, is also improved. For development of analytical and/or finite element models of the elevated-temperature forming of uniaxially oriented thermoplastic tubes, suitable constitutive models describing the temperature- and strain-rate-dependent stress—strain behaviour of the material along the axial (or orientation) and hoop (perpendicular to orientation) direction are required. The behaviours along both directions of the tube are required since its properties are anisotropic as a result of the extrusion process. The G'Sell et al. constitutive model, modified in this study to account for the effect of temperature, was shown to capture the uniaxial behaviour of oriented polypropylene tubes accurately along the axial and hoop direction at a range of elevated temperatures and strain rates.
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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 | 0.002 | 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 it