Mode I fracture specimens exhibiting oscillatory crack migration
Bibliographic record
Abstract
Damage propagation in [90/010/90]s double cantilever beam specimens, previously studied experimentally, was shown to exhibit an oscillating fracture pattern throughout the central two 90° plies. Interface delamination between 0° and 90° plies periodically migrated through the 90° plies in an oscillating manner. The experimental study showed significant toughening of the [90/010/90]s specimens when compared with a standard 0° DCB of the same material. The [90/010/90]s specimens were modeled in the present work. Damage was modeled using a Regularized eXtended-Finite Element Method to represent transverse matrix cracking and a standard interface cohesive zone method to represent interface delamination. A series of plane-strain and 3D models were produced to examine the effects of varying interfacial/ply strength and fracture toughness. 2D models qualitatively reproduced the oscillating migrating crack pattern, generally with a larger period of oscillation and lower fracture toughness. The 3D models illustrated that the oscillating migration is not responsible for the majority of toughening. Rather, it is concluded that the primary mechanism for increased toughness is a 3D, fiber bridging phenomenon as described in the experimental effort.
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How this classification was reachedexpand
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) | 0.000 | 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 |
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 teacher head, 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".