Effect of Test Specimen on Fracture Behavior of Lead-Free Solder Joints
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Bibliographic record
Abstract
ABSTRACT Double cantilever beam (DCB) and Arcan-type specimens have been used extensively in the literature to measure fracture properties of solder joints. However, the results obtained from these two fracture specimens have shown a marked discrepancy in terms of the critical strain energy release rate for crack initiation, J ci . The present study was aimed at explaining this difference by isolating the effect of the test specimen. Experiments on copper-SAC305-copper samples were carried out at intermediate strain rates (about 1 s -1 ). The value of the mean mode I J ci was 21 J/m 2 for the solder joints tested using the Arcan specimen; however, J ci obtained from DCB experiments was about 730 J/m 2 under mode I loading conditions. The effects of constraint on the plastic zone development in the solder layer was found responsible for these differences in J ci . This illustrates the significance of choosing test specimens with the same degree of crack-tip constraint as that in the actual solder joints under investigation.
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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 | 0.001 |
| 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 | 0.001 | 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 it