Vacuum-Bag Manufacturing of Honeycomb Structures: Opportunity for In-Situ Process Monitoring and Non-Destructive Voidage Estimates
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Bibliographic record
Abstract
A helicopter crew door was manufactured using out-of-autoclave prepregs and vacuum-bag-only processing techniques. Non-metallic honeycomb core was used to stiffen the structure. Miniature pressure sensors were embedded in the demonstrator to measure the honeycomb core pressure throughout the lay-up, including intermittent de-bulking, the pre-cure vacuum hold, and the elevated temperature cure. The sensors identified two insightful process phenomena: 1) gas evacuation increased with additional plies, implying that de-bulking may increase a skin's air permeability, thereby decreasing total process time, and 2) a non-uniform pressure response was observed in the part during cure, potentially leading to variations in part quality. Visible part quality was acceptable, excluding small radii geometrical features, a known source for defects in bag processing of woven materials. Internal part quality (voidage) was estimated in the honeycomb regions using pulsed infrared thermography non-destructive-evaluation. Calibration curves were generated by comparing thermography to micro-computed tomography images of the same samples. Macro-porosity around fibre bundles was identified as the major voidage source in these structures, and the thermography inspection identified significant local voidage variations over the part.
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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 | 0.000 |
| 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