Effect of Test Specimen on Fracture Behavior of Lead-Free Solder Joints
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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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 | 0.001 | 0.003 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 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".