Experimental and Numerical Determination of Mixed Mode Crack Extension Angle
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Bibliographic record
Abstract
Abstract Crack initiation angles for mixed mode fracture are measured and predicted using photoelastic and finite element techniques. Different crack inclination angles (0°, 10°, 20°, 30°, and 40°) are considered. The Schroedl and Smith method is used for estimating pure opening mode I stress intensity factor. On the other hand, the Sanford and Dally method is used to estimate stress intensity factors in mixed mode (I and II). The Smith and Smith method for estimating mixed mode SIF is also examined. In addition, the ANSYS finite element code is employed to estimate the pure and mixed mode SIF numerically. The estimated values of the SIF from both finite element analysis and photoelasticity are incorporated into six criteria for crack initiation angle prediction. The applicability of the crack initiation criteria such as maximum tangential stress (MTS), minimum strain energy density (S), maximum dilatational strain (T), maximum triaxial stress (M), modified MTS (MMTS), (R) criterion, and fringe symmetry axis method (FSAM) are investigated. An experimental setup is used to measure the initiation angles at different crack inclinations. The measured crack initiation angles are used to validate the predicted values. The results showed that the initiation angles estimated by different criteria using SIFs determined experimentally and numerically compared well with the measured ones, especially at higher inclination angles.
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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) | 0.000 | 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)
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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