Reliability Life Span of Fatigue Cracks
Bibliographic record
Abstract
Reliability analysis has become widely used as a method of accounting for uncertainty in the sizing of metal loss features in pipeline integrity management programs. As inline inspection (ILI) technology for crack detection becomes more widely available, the opportunity to use reliability methods in a manner similar to that already adopted for metal loss features presents itself. Nevertheless, the technical challenges to the application of reliability analysis of cracks are distinct from those that are relevant to the reliability analysis of metal loss features. Calculating the time-dependent threat of failure due to fatigue or corrosion fatigue must address different parameters than it would for metal loss features, and consequently this presents new challenges in developing statistical analysis tools. Such challenges include predicting operational pressure cycling, accounting for uncertainty in ILI crack sizing, and characterizing crack growth behaviour type. This paper provides an overview of some important parameters to be considered in reliability-based fatigue or corrosion fatigue analysis with some examples of how they have been addressed in work to date by Dynamic Risk Assessment Systems, Inc.
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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 | 0.005 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.002 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.001 |
| Open science | 0.001 | 0.000 |
| 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 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".