Water Absorption and Fiber-Matrix Interface Durability in Carbon-PEEK
Bibliographic record
Abstract
Moldings have been prepared from carbon-PEEK prepreg (APC2) in which the fibers were unidirectional. Their transverse mechanical properties were compared with those of moldings made from unreinforced PEEK. In addition, the water absorption at 23°C, 60°C, and 90°C of the polymer and composite were measured, together with the mechanical properties after various durations of immersion in 90°C water. The results showed that the interface was not affected by the immersion, at least up to 8000 h. There was a slight loss of polymer strength (20%) and failure strain (25%), which was reflected in the composite properties. Water absorption was determined almost entirely by the amount of polymer present in the composite. However, there was a small additional absorption, probably due to the relief of residual stresses. The results with respect to the interface were far more clear cut than those obtained from single fiber tests, supporting the contention that single fiber tests should be phased out as soon as possible.
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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 | 0.000 |
| 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) | 0.001 | 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".