Slab Fracture at 1900 Frames Per Second-Experimental Methods
Bibliographic record
Abstract
We present high speed video images of slab fracture experiments. Slab bending tests were conducted in a cold laboratory at Rogers Pass in Glacier National Park of Canada. A testing machine recorded the applied force and slab deflection in three- and four-point bending. Over the course of four days, the bending and resulting tensile fracture of 66 samples were captured by a high speed camera at rates of 1000 and 1900 frames per second. The purpose of capturing the tests on video was to observe the size of the fracture process zone and to calculate the speed of crack propagation. Slab samples were seeded with tracer particles for image analysis calculations, with the resulting pixel resolution in the sub-millimeter range. The samples were back-lit to illuminate the propagation of the crack. Dry slabs of differing density, hardness, crystal form and size, and temperature were sampled. Slabs of the same composition but different size were tested to investigate the size effect. The peak strength, stiffness, and shape of the loading curve were found to be very sensitive to the loading rate.
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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 | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.002 | 0.002 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.003 | 0.001 |
| Research integrity | 0.001 | 0.002 |
| Insufficient payload (model declined to judge) | 0.043 | 0.009 |
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".