Novel Isotropic Anti-Tri-Missing Rib Auxetics with Prescribed In-Plane Mechanical Properties Over Large Deformations
Bibliographic record
Abstract
Analogy with the standard anti-tri-chiral auxetic structure, a novel anti-tri-missing rib structure is proposed in this work. Finite element (FE) analyses (on one unit-cell) were carried out first to investigate the auxeticity and the underlying deformation mechanisms of the proposed structure with linear elastic base material. FE results show that the structure exhibits constant NPR over a relatively large strain range at few specific orientations. However, its auxetic behavior is inconspicuous and the in-plane isotropy only holds over limited strain range owing to the deficient rotational mechanism. An enhanced design with increased interior angle of the ligament and triangle reinforcement within the rotational central core was then proposed to improve the auxeticity and its in-plane isotropy. A theoretical formulation of the elastic modulus and Poisson’s ratio for the enhanced design was further developed based on Castigliano’s theorem. Tunable elastic modulus in the linear elastic regime and controllable isotropic constant NPRs over large strain ranges were thus achieved for the enhanced design without significantly compromising the overall stiffness. The targeted NPR performances were also verified with nonlinear base materials. Uniaxial tensile experiments and finite size simulations for lattice structures comprising an array of enhanced anti-tri-missing rib unit cells were finally performed to validate the FE and theoretical results obtained from unit-cell analyses.
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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 | 0.000 |
| 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) | 0.001 | 0.001 |
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".