Cyclic Deformation Response of Polycrystalline OFHC Copper under Pure Compression Fatigue
Bibliographic record
Abstract
Systematic experimental investigation was carried out to examine the cyclic deformation response and study the crack nucleation mechanisms under pure compression fatigue condition using OFHC Cu. Results show that the cyclic stress strain response and micro-structural evolution of copper under pure compression fatigue exhibits rather dissimilar responses compared to those under general push-pull fatigue conditions. Both rapid hardening and the compressive cyclic creep were observed in all tested conditions. Like under all fatigue conditions, surface micro-structural changes were detected by optical, SEM, and specifically AFM. It was revealed that cyclic plastic strain accommodated by the sample was not in any major way through dislocation activities, as there was only moderate slip activities observed on the surface and no PSB features were detected from TEM observations. Instead, cyclic creep was observed to be the major form of plastic strain accommodation. In addition, the observed surface phenomenon was found to have led to the eventual crack nucleation when the applied stress amplitude was high.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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) | 0.002 | 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".