Fail-safe Approach for the V-22 Composite Proprotor Yoke
Bibliographic record
Abstract
The V-22 proprotor yoke is fabricated from filament-wound unidirectional glass/epoxy belts that react to centrifugal force (CF) loads and beam and chord bending loads. Fiberglass tape is laid up at off-axis orientation between the unidirectional belts to react shear loads. The structural criteria for both metallic and composite V-22 dynamically loaded rotor components specify that these components be fatigue tested and analyzed to show a “safe life” of 30 000 h. Based on the fatigue test results of prototype and production proprotor yokes, a safe life of 30 000 h for the composite proprotor yoke could not be substantiated. However, testing of the yoke was continued beyond delamination initiation. The V-22 proprotor yoke continued to carry load in the fatigue tests with significant delaminations within the composite structure. These results, in addition to similar test results produced by Bell Helicopter Textron on composite proprotor yokes for commercially produced aircraft, indicate that it will be possible to substantiate this component using a “fail-safe” methodology.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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".