Crack Arrestment of Pi-Joined Bonded Composites
Why this work is in the frame
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Bibliographic record
Abstract
This paper describes current results of an ongoing program to develop a test verified analysis method for crack arrestment of bonded structures. Bonded specimens have been tested with and without fasteners, which include a bonded wide pull-off pi-joint specimen (Mode I), and a bonded double shear I-beam pi-joint specimen (Mode II). Finite element models utilizing the Virtual Crack Closure Technique (VCCT) for crack progression have been constructed to simulate the crack arrest capability of fasteners in the bondline of these composite joints. Promising comparisons were achieved between the models and tests, showing the ability of the damage modeling technique to predict the residual strength. However, the model and test comparisons have also shown that although the interlaminar fracture failure modes are necessary for model prediction of crack arrest behavior, additional failure modes occurred in the tests that will need to be included in the simulations.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 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 | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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