CF-18 Wing Full-scale Fatigue Testing And Structural Certification
Bibliographic record
Abstract
The Canadian Forces (CF) ordered 138 FIA-18 from McDonnell aircraft company (McAir)/Northrup for delivery starting 1982. The design was intended to last 6000 hours under severe US Navy usage. This life was determined by the manufacturer after conducting full-scale fatigue tests. These tests were required to certify the safe life of the F/A-l8 based on the USN operating conditions. However, the difference between the CF-18 usage and the usage on which the airframe was originally tested, in addition to these tests not considering structural modifications performed on production aircraft after completion of full-scale testing, have created some structural concerns and a need to do additional fullscale fatigue testing. The Canadian Forces and the Royal Australian Airforce (RAAF) are currently collaborating in the International Follow-On Structural Test Program (IFOSTP) to conduct a full-scale fatigue test for the CF-18. This paper will show a summary on the effort which is currently going on the FT245 full-scale fatigue testing of the CF-18 wing. The wing is being tested by the National Research Council of Canada (NRC) at the Institute of Aerospace Research (IAR) and technically supported by Bombardier Aerospace The fatigue test loads derivation process will be introduced, the test response and loading feedback monitoring through strain gauging of the entire wing and centre fuselage will be discussed, and the test inspection process for detectinglmonitoring growing fatigue cracks will be presented. The paper will also present the effort done in preparation for the structural certification of the CF18 wing. Transactions on Engineering Sciences vol 40, © 2003 WIT Press, www.witpress.com, ISSN 1743-3533
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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) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.001 | 0.000 |
| Insufficient payload (model declined to judge) | 0.012 | 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".