The effects of test set-up on the apparent flexural modulus of thin angle-ply laminates using standard four-point bend testing
Bibliographic record
Abstract
Four-point bending is a standard test method that can be used to determine flexural properties of a material or for quality control. The ASTM and ISO test standards specify an allowable range of set-up parameters such as the coupon width, the support span and the load span that can be used to determine the flexural modulus. When angle-ply laminates are tested in four-point bending the apparent flexural modulus is over predicted due to the bending-twisting coupling and the interaction between the coupon and the test fixture. In the present study, the effect of the test configuration on the apparent flexural modulus of thin angle-ply laminates in four-point bending is evaluated for six different layups. It is shown that test set-ups that allow more twisting of the coupon will result in apparent flexural moduli that are closer to the theoretical value. The torsional moments induced by the test fixture are quantified, and it is shown that they are directly responsible for the increase in the apparent flexural modulus.
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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 | 0.001 | 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) | 0.000 | 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".