Impact and compression behaviour of AFP manufactured carbon/epoxy composites containing gaps and overlaps
Bibliographic record
Abstract
The objective of this paper is to present the effect of gaps and overlaps on the mechanical properties of an AFP manufactured 24-plies quasi-isotropic carbon/epoxy composite. Tests are carried out using 7 defect configurations in Open Hole Compression (OHC) specimens (ASTM D 6484) and 4 defect configurations in drop weigh impact tests specimens (ASTM D7136). Ultrasonic C-scan observations and compression after impact tests (ASTM D7137) were performed on impacted specimen. Tests results show that 90° defects have the most important effect on OHC strength (between 7% and 13% strength reduction for 90° gaps) due to 45° plies waviness whereas specimen with 0° gaps or 0° overlaps have a maximum strength variation of 7%. It is also observed that AFP defects have a local effect on composite impact response but they do not have a significant effect on coupons impact response. An analytical model which predicts the effect of 0° defects on the compressive properties is proposed in this paper. Using classical laminate theory, this model recalculates the material's properties considering the effect of the defect on the global mechanical properties of the specimen. The prediction of the model show very good agreement with the experimental results and demonstrate that 0° defects do not create stress concentrations which lead to specimen failure.
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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) | 0.001 | 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) | 0.001 | 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".