Organization and Basis of ASME Section XI, Nonmandatory Appendix Y, “Crack Growth Rate Curves”
Bibliographic record
Abstract
Abstract Nonmandatory Appendix Y of ASME Section XI presents relationships for fatigue crack growth rates and stress corrosion crack growth rates for austenitic stainless steels, ferritic steels, and nickel alloys for use in analytical evaluations. These crack growth rate equations are needed to predict the crack growth rate for the applicable cracking mechanism, material, and environment. The cracking mechanisms addressed are fatigue in air, fatigue in water environments, stress corrosion cracking, and irradiation-assisted stress corrosion cracking. Boiling water reactor and pressurized water reactor water environments are included. Nonmandatory Appendix Y was introduced within the 2021 Edition of the ASME Boiler and Pressure Vessel Code as a consolidated repository for crack growth rate equations. A second objective of Appendix Y is to standardize the nomenclature, physical units, and figures associated with the various crack growth rate relations. Changes anticipated for the 2023 Edition include moving all crack growth rate provisions from other nonmandatory Section XI appendices (including Nonmandatory Appendices A and C) into Appendix Y. This paper describes the organization of the 2023 Edition of Appendix Y and documents the source of each equation. Also tabulated are the active Section XI Code Cases that include crack growth rate equations, as well as the most recent status of acceptance by the U.S. Nuclear Regulatory Commission.
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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 | 0.005 | 0.015 |
| Meta-epidemiology (narrow) | 0.002 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.006 | 0.005 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.003 | 0.003 |
| Open science | 0.003 | 0.002 |
| Research integrity | 0.002 | 0.001 |
| Insufficient payload (model declined to judge) | 0.208 | 0.220 |
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".