Effect of high-temperature high-speed airflow on the thermo-oxidative aging of epoxy polymer and composite: An experimental study
Bibliographic record
Abstract
The objective of this study is to investigate the effect of the airflow on the thermo-oxidative aging of polymer matrix composites (PMCs). Understanding how airflow affects the aging process is crucial for designing composite parts subjected to airflow conditions, such as in aeronautics. We conducted tests in an oven at 150 °C and in wind tunnel at Mach 0.85 to compare static and dynamic aging conditions. The airflow conditions are determined using a Reynolds Averaged Navier–Stokes (RANS) Computional Fluid Dynamic (CFD) simulation to estimate the pressure and temperature conditions at any point of the air-polymer interface. The oxidation is characterized by colorimetric and roughness testing. Based on our experimental data and simulation results, we show that the compressibility effect of the airflow affects the pressure field at the interface and the thermal boundary layer affects the temperature of the samples. The samples aged in the wind tunnel are always more oxidized than those aged under oven conditions. The airflow accelerates the thermo-oxidation by mainly increasing the static pressure.
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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) | 0.001 | 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 | 0.001 | 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".