Stress Enhanced Corrosion at the Tip of Near-Neutral pH Stress Corrosion Cracks on Pipelines
Why this work is in the frame
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Bibliographic record
Abstract
In this work, corrosion at the tip of stress corrosion cracks on an X65 pipeline steel was investigated under various stress levels in a near-neutral pH solution. Electrochemical and micro-electrochemical measurements, combined with surface characterization and stress simulation, were conducted to understand the mechanistic aspects of stress enhanced corrosion at crack tip and its role in crack propagation in the steel. Results demonstrated that significant stress concentrations can develop at crack tip and enhance corrosion of the steel in the solution. The steel is in an active dissolution state. The crack propagation rate increases with the enhanced corrosion at the crack tip. However, the cracking mechanism is stress dependent. At the applied load of 600 N, the crack propagation is mainly a result of the steel dissolution at the crack tip. When the local stress level at the crack tip is smaller than this value, corrosion, rather than cracking, occurs inside the crack. When the stress level at the crack tip is sufficiently high to exceed the stress associated with the applied load of 600 N, corrosion becomes less important in the cracking process. Instead, the stress factor dominates the stress corrosion crack propagation.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 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 it