Accelerated Life Testing Solder Reliability in Combined Environments: ISO Temperatures with Harmonic Vibration
Why this work is in the frame
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Bibliographic record
Abstract
ABSTRACT This paper updates progress in the development of methods for investigating solder joint reliability in a combined environment for vibration and thermal cycle testing. Since combined environmental testing is an evolving concept, no default approach or standard test protocol currently exists. The need to develop such a protocol arises because materials fatigue earlier under combined stress conditions than separate exposure to the same levels of thermal and vibration. Combined environmental testing would therefore provide the closest approximation to actual field conditions and the best means of evaluating the performance capability of solder joints. In developing this protocol, consideration was given to obtain relevant information from both a reliability perspective (number of cycles to failure) as well as micro-structural stand point (at time of failure). Further, in combining the two conditions, time to failure had to be weighed against the overall expected time of the test; when performed alone, vibration testing is often completed within a single day, while thermal cycle testing can take up to six months to complete. Phase 1a of this project is complete and results have been published in (McMahon, Juarez, et al, 2016) 14 . They compare the performance of SAC305 alloy on ENIG and OSP solder pad surface coatings. Phase 1b failure results presented here for isothermal harmonic vibration life testing for SAC305, Sn-Pb, and Violet each at 25C, 75C, and 125C for various strain levels suggest a thermal cycling protocol with injection of vibration at 75C. Phase 2 will then use this protocol to evaluate, characterize, and compare various lower melt, high reliability, Bi-containing alloys against currently used SAC305 and Sn-Pb solders under the same combined environmental conditions.
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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 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.002 |
| 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