Predicting the Strength of Solder Joints using Cohesive Zone Modeling
Bibliographic record
Abstract
ABSTRACT The fracture of a lead-free solder joint (96.5Sn3.0Ag0.5Cu and copper) under mode I loading conditions was simulated using a cohesive zone model (CZM) implemented in ANSYS® finite element software. The CZM parameters were determined using mode I fracture data from experiments with double cantilever beam (DCB) solder joint specimens. These CZM parameters, along with the mechanical properties of the solder and the copper, were then used in the finite element simulations to predict the failure loads of solder joints in two configurations: (i) DCB joints and (ii) linear arrays of discrete 1-2 mm solder joints having various pitches. The latter specimens permitted an investigation of the parameters affecting load sharing among discrete joints such as those found in ball grid arrays. The model predictions were in good agreement with the experiments.
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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) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| 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 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".