Nasa-Dod Pb-Free Electronics Rework Project: Effect Of 1x And 2x Eutectic Solder Rework On Vibration Reliability
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
ABSTRACT Crane Naval Surface Warfare Center, a NASA-DOD Consortium member, added 30 test vehicles to the NASA-DOD Pb-free Electronics study (Project 2) in support of their Naval Supply Command (NAVSUP) sponsored “Logistics Impact of Pb-free Circuits/Components” project to quantify the effects of rework of Pb-free solder joints with SnPb solder. Multipass SnPb 1X and 2X rework was performed on Pb-free DIP, TQFP-144, TSOP-50, LCC and QFN components on SAC305 (24 boards) and SN100C (6 boards) soldered assemblies. Nine (9) boards were tested in drop shock, nine (9) in vibration, and eight (8) in accelerated thermal cycling test. The boards were vibration tested for one hour each at 8, 10, 12, 14, 16, 18, 20, and 28 Grms. An event detector was used to electrically monitor and record failures. Overall, there were 461 failures out of a total of 567 components. The results appear to have a significant amount of variation. Our preliminary conclusion of this study is that, for the components reworked in this study, a qualified rework facility with a capable process can rework Pb-free boards with SnPb solder alloy and create solder joints that have reliability comparable to as-manufactured Pb-free assemblies.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 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 | 0.001 | 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