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Article dans une revue

An analysis of high-frequency Helmholtz problems in domains with conical points and their finite element discretization

Théophile Chaumont-Frelet, Serge Nicaise

We consider Helmholtz problems in three-dimensional domains featuring conincal points. We focus on the high-frequency regime and derive novel sharp upper-bounds for the stress intensity factors of the singularities associated with the conical points. We then employ these new estimates to analyse…

Computational Methods in Applied Mathematics, 2022, ⟨10.1515/cmam-2022-0126⟩. ⟨hal-04001691⟩

Article dans une revue

Water-Based Synthesis of Zr6-Based Metal–Organic Framework Nanocrystals with Sulfonate Functions: Structural Features and Application to Fructose Dehydration

Bakytzhan Yeskendir, Priscilla Magalhaes de Souza, Pardis Simon, Robert Wojcieszak, Christian Courtois, Yannick Lorgouilloux, Sebastien Royer, Jean-Philippe Dacquin, Jérémy Dhainaut

A series of zirconium-based metal−organic framework (MOF) nanocrystals (95−211 nm) displaying sulfonate functions (UiO-66-SO3H) was prepared in N,N-dimethylformamide (DMF) - the conventional solvent - and water, and their physicochemical properties were thoroughly investigated. In particular, X-ray…

ACS Applied Nano Materials, 2022, ACS Applied Nano Materials, ⟨10.1021/acsanm.2c02916⟩. ⟨hal-03794329⟩

Communication dans un congrès

Manufacturing methods of bioceramic scaffolds

Marie Lasgorceix, Anne Leriche

For many years, bone substitutes have been made from calcium phosphate powders because of their excellent biological properties. Different methods are used to manufacture scaffolds with a porous architecture that aims to approximate the natural bone skeleton. Several fabrication methods for…

BIOCERAMICS 32, Sep 2022, Venice, Italy. ⟨hal-04392004⟩

Communication dans un congrès

Shaping of complex ceramic parts using stereolithography and gel casting

Pierre Grimaud, Fabrice Petit, Laurent Boilet, Marie Lasgorceix, Florian Jean, Anne Leriche, Pascal Laurent, Shaan Chamary, Philippe Champagne

The “gel casting” is a process used for producing parts with complex geometries. It was initially developed to overcome the limitations of other shaping processes such as injection moulding or machining. Designed by Janney & Omatete [1] in 1991, this process is very versatile, both in terms of…

SHAPING 8, Sep 2022, Dübendorf, Switzerland. ⟨hal-04392052⟩

Communication dans un congrès

Shaping of ceramics by hybrid binder jetting

Enrique Juste, Qirong Chen, Marie Lasgorceix, Anne Leriche, Charles Duterte, Fabrice Petit

Additive manufacturing by binder jetting is becoming increasingly popular to process ceramics. This technology is not only highly productive but also all-material compatible and is one of the few truly "free form" additive processes. Unfortunately, it suffers from a series of limitations…

SHAPING 8, Sep 2022, Dübendorf, Switzerland. ⟨hal-04392051⟩

Article dans une revue

Stability results of locally coupled wave equations with local Kelvin-Voigt damping: Cases when the supports of damping and coupling coefficients are disjoint

Mohammad Akil, Haidar Badawi, Serge Nicaise

In this paper, we study the direct/indirect stability of locally coupled wave equations with local Kelvin-Voigt dampings/damping, where we assume that the supports of the dampings and the coupling coefficients are disjoint. First, we prove the well-posedness, strong stability, and polynomial…

Computational & Applied Mathematics, 2022, 41 (6), ⟨10.1007/s40314-022-01956-6⟩. ⟨hal-04346878⟩

Article dans une revue

Post-infiltration to improve the density of binder jetting ceramic parts

Qirong Chen, Enrique Juste, Marie Lasgorceix, Guillaume Lefebvre, Christophe Tenailleau, Benjamin Duployer, David Grossin, Fabrice Petit, Anne Leriche

Infiltration of printed bodies with a ceramic suspension is a relevant approach to enhance density and properties of the porous binder-jetted parts. In the present work, significant improvements of alumina parts processed through this combination printing-infiltration was reported. The density of…

Journal of the European Ceramic Society, 2022, 42 (15), pp.7134-7148. ⟨10.1016/j.jeurceramsoc.2022.08.005⟩. ⟨hal-03889846⟩