A Possible Method for Obtaining Fracture Parameters for Crack Propagation in Quasi-Brittle Materials Subject to Compression
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Bibliographic record
Abstract
Quasi-brittle engineering materials contain flaws such cracks, pores, voids and fissures. Mode I cracking from such pre-existing flaws is the major cause of brittle fracture of these materials in compression. It is commonly accepted that that failure in uniaxial compression is characterized by multiple cracks propagating parallel to the direction of compression, whereas brittle failure in tension is typified by the propagation of a single crack. The energetics of crack propagation in compression are clearly different to those in tension. We report on a method used to study compressive fracture of concrete and masonry with a single crack. Pre-set cracks with different shapes of crack tip were placed in specimens. These specimens were tested to study their effect on compressive fracture. Specimens with cylindrical pre-set cracks failed with a single crack parallel to the compression.
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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) | 0.000 | 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) | 0.000 | 0.000 |
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Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
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