Transition of neck appearance in polyethylene and effect of the associated strain rate on the damage generation
Bibliographic record
Abstract
By reducing tensile test speeds over four orders of magnitude, from 5 to 0.001 mm/min (corresponding to the initial strain rate of 4 × 10−3 to 8 × 10−7 s−1), color of polyethylene (PE) specimens remains translucent during the necking process, no longer changing to opaque white. Since changing the color to opaque white indicates the presence of cavities, the unchanged color suggests that such cavitation process is avoided by reducing the crosshead speed. With this discovery, the study proceeds to investigate the mechanical behavior of PE specimen shown at two crosshead speeds, 1 and 0.001 mm/min, before neck is developed; the former crosshead speed leads to opaque white neck but the latter translucent. The results show that at 1 mm/min, a stretch corresponding to a strain smaller than 4% can cause degradation of mechanical properties. Since this level of deformation is close to that allowed in service, the study recommends the consideration of in‐service loading rate for evaluation of the mechanical properties, especially for long‐term applications such as plastic pipes for natural gas transportation. POLYM. ENG. SCI., 54:1871–1878, 2014. © 2013 Society of Plastics Engineers
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".