Comparison of the load/displacement and energy absorption performance of round and square AA6061-T6 extrusions under a cutting deformation mode
Bibliographic record
Abstract
Quasi-static compressive testing of extruded aluminum alloy AA6061-T6 round and square cross-sectional tubular specimens was completed to investigate the crush characteristics of these structural members under a cutting deformation mode by using a specially designed cutting tool. Results from the experimental tests showed that the cutting deformation mode of the round and square tubes exhibited high crush force efficiencies (CFE) of 0.95 and 0.81 respectively. In comparison, CFE of round specimens that experienced progressive folding and global bending deformation modes were observed to be 0.66 and 0.20 respectively and CFE of square specimens that underwent global bending were found to be 0.22. An almost constant cutting force was observed for the round tubes in the cutting deformation mode, while a slight increase in the cutting force was observed for the square tubes under the same deformation mode. The increase in cutting force for the square tubes was observed to occur primarily due to contact arising between the cutting tool and tube sidewalls and to a lesser extent due to bending of the petalled side walls. For the round tubes, contact between the cutting tool and sidewalls as well as bending of the petalled side walls was not as significant and resulted in a more consistent cutting force. For both the 200 mm and 300 mm length tubes the total energy absorption for the round and square tubes was observed to be 6.11 kJ and 4.31 kJ respectively. The energy absorption was observed to be independent of tube length.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 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) | 0.002 | 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 source (direct Gemma or distilled Codex), 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".