Shear Load Transfer for Corrosion Coated Clamped Joints
Bibliographic record
Abstract
Rotorcraft transmission housings contain multiple joints that are typically held together by threaded fasteners. For many of these installations, the material surfaces are now coated with corrosion inhibitors that can change the strength of the joint. To identify these changes, Bell Helicopter has conducted coupon testing of coated materials in shear. Historically, the faying surfaces have been left bare with the perception that coatings would degrade the ability to transfer shear loads. Fastener and joint design has been based on assumed joint slip coefficients. A test effort to identify the shear load transfer characteristics of a clamped joint was undertaken. A double shear coupon test was used to measure the shear load capability of the clamped joint with bare material surfaces as well as with corrosion protection coated surfaces. Tests were run with calibrated bolt preloads to reduce variability. To simulate the gearbox temperature environment, the test coupons and mechanical grips were placed in an oven to maintain a temperature of 180°F. Testing showed that the addition of coating reduced the joint slip coefficient when compared to baseline bare materials.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.004 | 0.001 |
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".