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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), 21 p. ⟨10.1007/s40314-022-01956-6⟩. ⟨hal-04346878⟩

Pré-publication, Document de travail

Do Shape Memory Alloy cables restrain the vibrations of girder bridges? -A mathematical point of view

Virginie Régnier

We study the energy decay of a damped Euler-Bernoulli beam which is subject to a pointwise feedback force representing a Shape Memory Alloy (SMA) cable. The problem we consider is that of [13] but, for simplicity, our modelization does not take into account the additional stiffness term they…

2022. ⟨hal-03722113⟩

Thèse

Directed and Radial Random Spanning Forests in Hyperbolic Spaces, Forêts aléatoires couvrantes, dirigées et radiales, en espace hyperbolique

Lucas Flammant

In this thesis, two models of geometric spanning random trees in hyperbolic geometry are studied: the hyperbolic DSF (Directed Spanning Forest) and the hyperbolic RST (Radial Spanning Tree). These are random graphs constructed on Poisson point processes in the hyperbolic space Hd of dimension d≥2…, Dans cette thèse, deux modèles d’arbres aléatoires géométriques couvrants en géométrie hyperbolique sont étudiés : la DSF (Directed Spanning Forest) et le RST (Radial Spanning Tree. Il s’agit de graphes alétoires construits à partir de processus ponctuels de Poisson dans l’espace hyperbolique Hd de…

Statistics [math.ST]. Université Polytechnique Hauts-de-France, 2022. English. ⟨NNT : 2022UPHF0022⟩. ⟨tel-04186470⟩

Communication dans un congrès

Shaping of ceramic by binder jetting

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

Additive Manufacturing by binder jetting is becoming increasingly popular to process ceramics. This layer-by-layer technique consists in building up a part from powder beds on which a binder is selectively deposited. Such technology is not only highly productive but also all-material compatible and…

Ceramics in Europe 2022, Jul 2022, Krakov, Poland. ⟨hal-04392026⟩

Communication dans un congrès

Fabrication of doped b-tricalcium phosphate bioceramics by robocasting for bone repair applications

Nicolas Somers, Marie Lasgorceix, Florian Jean, Anthony Thuault, Sandra Balvay, Christelle C. Der Loughian, Nicolas Preux, Cathy Delmotte, Fabrice Petit, Anne Leriche

b-tricalcium phosphate (b-TCP, b-Ca 3 (PO 4 ) 2 ) is one of the most attractive biomaterials for bone repair since it shows an excellent biological compatibility, osteoconductivity, and resorbability. It is already commercialized under granules or preforms for bone filling but there are still some…

Ceramics in Europe 2022, Jul 2022, Krakov, Poland. ⟨hal-04392030⟩

Article dans une revue

Novel Portland cement matrices incorporating a gamma -MnO2 /Ag2O hydrogen/tritium getter -structure changes and trapping performance

Sandy Lanier, Catherine Davy, Cyrille Albert-Mercier, Oriane Farcy, Céline Cau Dit Coumes, David Lambertin

This study investigates novel Portland cement-based mortars, developed for hydrogen/tritium trapping and radioactive waste immobilization. They incorporate a γ-MnO2/Ag2O getter powder at 10% wt (i.e. 6.8 to 7.1% vol). Compared to former patented materials, no drying or heat treatment of the…

Journal of Nuclear Materials, 2022, Journal of Nuclear Materials, 567, pp.153819. ⟨10.1016/j.jnucmat.2022.153819⟩. ⟨hal-04044334⟩

Article dans une revue

Morphological, structural, electrical, and piezoelectric analysis of hydrothermally grown ZnO nanowires on various substrates

Abderrahmane Hamdi, Ahmad Hamieh, Mervat Alamri, Karim Dogheche, M.M. Saj Mohan, Rachel Desfeux, Denis Remiens, El Hadj Dogheche

In this present work, we have successfully fabricated a piezoelectric structure based on ZnO nanowires (ZnO NWs) using a simple, low cost and environmentally friendly hydrothermal method. This structure forms the basis to fabricate vertically integrated nanogenerator device. This paper attempts to…

Surfaces and Interfaces, 2022, 31, 12 p. ⟨10.1016/j.surfin.2022.102103⟩. ⟨hal-03694897⟩

Article dans une revue

Mechanical and optical properties of MgAl2O4 ceramics and ballistic efficiency of spinel based armour

Caroline Gajdowski, Raffaele d'Elia, Norbert Faderl, Judith Böhmler, Yannick Lorgouilloux, Sébastien Lemonnier, Anne Leriche

This study was devoted to the understanding of the influence of MgAl2O4 ceramic properties on their ballistic performances. By modifying the processing parameters, ceramics with different microstructures were obtained. Among them, a transparent MgAl2O4 spinel with an in-line transmission between 77…

Ceramics International, 2022, 48 (13), pp.18199-18211. ⟨10.1016/j.ceramint.2022.03.079⟩. ⟨hal-03850557⟩