In-service effects on the mechanical and fracture properties of steel from the Royal Canadian Navy ship ex-HMCS IROQUOIS
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Bibliographic record
Abstract
This work presents selected results from a study characterizing the aged steel from the decommissioned Royal Canadian Navy destroyer ex-HMCS IROQUOIS, in addition to the mechanical behaviour of new similar grade steel. The aim of this work is to determine whether the present-day mechanical properties of the aged steel still meet their original design requirements. The testing program included orthotropic tensile behaviour, fracture energies, ductile-to-brittle transition temperature, hardness and post-failure fractographic analyses to better identify the associated failure mechanisms. The aged steel (IROQ-steel) specimens were cut from the hull plating, as well as primary/secondary stiffener flanges and webs. In addition, the new steel specimens were prepared from a similar grade steel (300W) for comparison purposes. The initial results show that the steel from all locations still meet the design requirements and compare favourably well with the new 300W steel behaviour. Interestingly, results also showed differences in tensile behaviour for the 300W steel based on tensile specimen thickness, but no similar behaviour was observed for the IROQ steel.
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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 | 0.000 | 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 | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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