Experimental Research on Explosively Driven Crack Initiation and Propagation from Flaws of Various Geometry
Bibliographic record
Abstract
Abstract The aim of this study is to explore the fracture dynamic properties of defect bodies under explosion loading by using the system of digital laser dynamic caustics test. The propagation of directional cracks and the fracture process of defect bodies have been observed by high-speed camera, as well as analyzed for the changing rules of speed and stress intensity factors when the directional crack was close to defect. Experimental results found that the defect has an inhibitory effect on the spreading of cracks when the detonation crack is extended toward the defect. With the decrease of the curvature of the elliptical defect, the energy accumulation rate decreases with the decrease of the curvature in the process of the generation of the cracks at the endpoints of wings, and its fracture toughness increases with the decrease of the curvature, and when the curvature is reduced to a certain extent, the wing crack cannot crack. The dynamic stress intensity factor of the crack tip has a positive correlation with the velocity of cracking, within a certain range. The fracture toughness of the crack at the time it begins is larger than during its spreading.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.001 |
| 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) | 0.003 | 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 source (direct Gemma or distilled Codex), 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".