Residual stress effects on the propagation of fatigue cracks in the weld of a CA6NM stainless steel
Bibliographic record
Abstract
The fatigue crack growth behavior in an automatic flux core arc weld was investigated for stainless steel alloy CA6NM.As-welded and heat treated compact tension specimens were prepared with the crack propagation plane perpendicular to the weld.Constant stress intensity factor range tests were performed at a load ratio R = 0.1 to reveal intra-specimen fatigue crack growth rate variations and differences between the fatigue crack growth behavior of as-welded and heat treated specimens.Comparing the fatigue crack growth rate of as-welded and heat treated specimens revealed that the crack propagates at a faster rate in the as-welded specimens where indications point to the existence of tensile residual stresses acting on the crack tip by inhibiting crack closure.As for the heat treated specimens, when the crack is in the base metal, the fatigue crack growth rate decreases accompanied by an increase in crack closure levels.Tensile residual stresses that may have remained after the post-weld heat treatment and their subsequent relaxation with crack growth could explain this behavior.
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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 | 0.000 |
| 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) | 0.001 | 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".