Load Sharing Between Discrete Solder Joints in Bending: Effect of Spacing and Joint Properties
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Bibliographic record
Abstract
The fracture loads of copper-solder-copper double cantilever beam (DCB) specimens containing two discrete solder joints were measured and found to be maximum at a certain characteristic joint spacing. A finite-element model (FEM) showed that this corresponded to a minimization of the solder peel stress and an optimal load sharing among the two joints. This behavior was also analytically modeled using both a continuous foundation model and a simplified discrete foundation model, which isolated the effects of joint geometry and the bending stiffness of the solder and substrates. The model predictions of the characteristic joint spacing for both DCB and three-point bending configurations were satisfactorily compared with the FEM and the experimental data. The proposed approach is useful in predicting the load sharing among the multiple solder joints typical of surface mount microelectronic devices and in designing joint with maximum strength.
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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 | 0.001 | 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 | 0.000 |
| 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