Precyclic-Loading-Induced Stress Corrosion Cracking of Pipeline Steels in a Near-Neutral-pH Soil Environment
Bibliographic record
Abstract
Two pipeline steels of different grades were used to study the effect of cyclic loading prior to corrosion exposure upon the initiation of stress corrosion cracks in a near-neutral-pH soil environment. A cyclic loading scheme was constructed based on pressure fluctuation data collected on operating pipeline systems. The specimen surface was either mirror-polished or polished to a 600-grit finish.. It was found that precyclic loading caused the formation of microcracks on the specimen surface during subsequent corrosion exposure under constant load and under mild cathodic polarization. No such microcracks occurred at the open-circuit potential because of uniform corrosion. For specimens polished to a 600-grit finish, the microcracks were either inclined at 45° to the loading direction or aligned along the polishing scratches; for mirror-polished specimens, only microcracks inclined at 45° were observed. The formation of microcracks is attributed to the presence of localized deformation, such as persistent slip bands. These microcracks established the site for crack initiation and facilitated the development of stress corrosion cracking during subsequent slow strain rate testing.
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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) | 0.001 | 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 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".