Characterization of metamaterials used as support structures in additivemanufacturing
Notice bibliographique
Résumé
Additive manufacturing (AM) of high temperature alloy components requires a post-processing step consisting in inducing hot isostatic pressure (HIP) which aims to obtain an adequate microstructure and reduce porosity. During this treatment, the printed parts are likely to crack due to the induced deformations. This problem currently limits the deployment of AM in the manufacture of turbomachines. To solve the problem of cracking, this research project proposes the study of the behavior of new "lattice" structures which, integrated into the supports of printed parts, would allow a reduction in the residual stresses causing cracking during the HIP. The main objective of the research project is to provide a complete characterization of new "lattice" structures under complex loading modes from a multi-scale model. This model will enable highly reliable component-scale structural behavior predictions that can be leveraged to rapidly implement optimized metamaterials in engineered components with varying geometries, load cases, and operating temperatures. The optimized metamaterials will have unique macrostructures designed to exhibit specific mechanical properties, such as high strength-to-weight ratios, enhanced ductility, or tailored thermal expansion coefficients, that cannot be achieved using conventional materials. The behavior of these new structures is different from conventional structures in terms of temperature and stress profile. Although preliminary results indicate that they could work in a limited design space, there is a high level of uncertainty that these structures will still provide the expected benefits when considering printability, manufacturability, cost, cooling, damping, or other value attributes. The first stage of the project was to design the test coupons using Rhino Grasshopper which uses mathematical logic to create surfaces. Once the gage section of the tensile specimens was created, the design of the coupon had to be completed using a CAD software. Currently, the research team is designing a static finite element simulation model that would allow the study of the mechanical behavior of the newly developed structures. The finite element model is being validated with experimentally obtained tensile test results. Once the model has been validated, it will be possible to carry out a design of experiments which would make it possible to vary all the design parameters of the lattice structures developed. Additionally, new tensile and compression samples have been designed and are in the process of being printed. These new test specimens all have different amplitudes and wavelengths, and they will be mechanically tested to fully characterize the behavior of the new structures.
Récupéré en direct depuis OpenAlex et désinversé. Les résumés ne sont pas conservés dans cette base de données : les index inversés représentent 8,6 Go des 9,3 Go de texte de la base, et le serveur dispose de 13 Go libres.
Comment cette classification a été obtenuedéplier
Prédiction machine sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Le volet Gemma est une étiquette directe du modèle pour chaque travail de la base, lue sur la notice réduite au titre. Le volet Codex est un classifieur appris des 10 348 étiquettes directes de Codex et calibré sur les taux pondérés de l'échantillon; les champs sans appui suffisant ne portent aucun appel Codex. Le mode candidate est l'union des deux volets; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont pas des étiquettes humaines.
Scores du classifieur distillé par catégorie (deux têtes)
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,000 | 0,000 |
| Méta-épidémiologie (sens large) | 0,000 | 0,000 |
| Bibliométrie | 0,000 | 0,000 |
| Études des sciences et des technologies | 0,000 | 0,000 |
| Communication savante | 0,000 | 0,000 |
| Science ouverte | 0,000 | 0,000 |
| Intégrité de la recherche | 0,000 | 0,000 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,001 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule source (Gemma direct ou Codex distillé), pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».