Localized Cyclic Strain Measurements of Friction Stir Welded Aluminum Alloy Using a Flat-Clad Optical Fiber Sensor Array
Bibliographic record
Abstract
Strain-controlled fatigue tests especially at high strain amplitudes for welded joints demand the strain sensors capable of reaching ±8000 ¿¿ and of a size of a few millimeters. However, these sensors are not available on the market. Here we report the application of a newly-developed flat-cladding Fiber Bragg grating sensor array in the characterization of cyclic deformation behavior of friction stir welded Al-Zn-Mg aluminum alloy tested at high strain amplitudes. Significant difference in the plastic strain amplitudes was detected via these optical fiber sensors mounted in the nugget zone and across the boundary between thermomechanical-affected zone and heat-affected zone. Initial cyclic softening followed by hardening in the nugget zone was observed as cyclic deformation progressed.
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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 | 0.001 | 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 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 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 teacher head, 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".