Thermal-Creep Induced Stress Relaxation Near a Notch in Zr-2.5Nb
Bibliographic record
Abstract
In CANDU nuclear reactors, flaws on the surface of Zr-2.5Nb pressure tubes naturally cause stress concentration, and subsequently potentially lead to crack initiation through delayed hydride cracking. However, the concentrated stresses tend to relax due to creep, which is suggested to reduce the occurrences of cracks. In this study, C-shaped specimens with a small radius notch (15μm or 30μm) manufactured from Zr-2.5Nb pressure tubes were first preconditioned through an ex-situ creep process (Keff = 6MPam, 583K) for a series of hold times. Elastic lattice strains around the notch were measured using high energy X-ray diffraction at the Advanced Photon source. Results show that strains along the loading direction are tensile and concentrated in front of the notch tip, while those perpendicular to the loading direction are compressive and distributed symmetrically about the notch plane. The concentrated strains relax with creep time, and the larger-size notch has a higher rate of relaxation.
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How this classification was reachedexpand
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 | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.005 | 0.002 |
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; both teacher heads agree on what is shown here.
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".