Friction stir lap welding of AA7075-T6 stringers on AA2024-T3 skin
Bibliographic record
Abstract
Friction stir welding (FSW) is an emerging manufacturing technology that is being increasingly used in the fabrication of aerospace structures. The Institute for Aerospace Research of the National Research Council Canada began an extensive study to establish design process guidelines and to facilitate the development and use of FSW in a large-scale representative structural element from an aircraft, such as a fuselage panel. This paper mainly focuses on the results of mechanical tests and subsequent analysis that was used to ascertain the feasibility of using FSW to join AA 7075 stringers to AA 2024 skin. The weld configurations studied were: discontinuous (with plunge-in entry and exit holes), continuous welds, single pass welds, double pass welds, and plugged (rivet) discontinuous welds. S-N curves, bending behaviour, failure locations, defect characterization and joint distortion are discussed. The results were also compared with riveted lap joints of identical geometry mainly in terms of cyclic strength performance of FSW panels. This research provided some valuable insight into both the fabrication and the application of FSW on stringer/skin lap joints.
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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) | 0.003 | 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".