MaIsoVi project Vacuum insulation materials, innovative approach for windows in construction and renovation

peer reviewedThe building sector is responsible for almost 36% of CO2 emissions in Europe and 40% of energy consumption. This underlines the need to develop new solutions to support the strategy of reducing the energy needs of housing. The objective of the MaIsoVi project (GreenWin n°8653) is to offer the construction and renovation market for the residential and commercial (tertiary) segment: - A vacuum glazing (tempered FINEO) demonstrating the same or better energy efficiency than triple glazing but with the same weight as double glazing and the thickness of single glazing. - A wooden window equipped with this FINEO and using a minimum of materials while guaranteeing the best performance over a maximum extended life span. The implementation processes and the design of these products will be optimized to obtain a lower environmental footprint than the state of the art (triple glazed wooden window). The life cycle assessment (LCA) of the products and their processing is conducted during all the steps of the project to ensure the completion of this objective. The tempered FINEO glazing will be produced in the Walloon region at AGC site in Lodelinsart. The wooden frame will be manufactured at Menuiserie Riche in Mariembourg, and the FINEO window will be marketed in Belgium, a large part of France and neighboring countries. Two research centers, Materia Nova and Cenaero, will support the development and characterization of the new products, and Liège University will be in charge of the LCA. The first step of the LCA is the development of a friendly tool for the design of the wood window to explore different solutions without having to remodel the process, and to point out the potential parts leading to a reduction (or an increase!) of the global footprint, such as the design and the subsequent use of wood, or the wood species for the different parts. This project is supported by the GreenWin Competition Clusters and subsidized by the Walloon Region (BE).9. Industry, innovation and infrastructure11. Sustainable cities and communities12. Responsible consumption and production13. Climate actio

On the elasto-viscoplastic behavior of the Ti5553 alloy

The elastoviscoplastic behavior of the Ti5553 alloy is characterized and compared to the classical Ti–6Al–4V alloy. The true stress–strain curves are determined based on tensile tests performed under different strain rates at room temperature and at 1501C, from which the elastic constants and the parameters of a Norton–Hoff viscoplastic model are identified. The strength of the Ti5553 alloy is 20–40% higher than the strength of the Ti–6Al–4V alloy. The Ti5553 alloy constitutes thus a promising candidate for advanced structural applications. In view of modeling structural applications of forming operations, the elastic and plastic initial anisotropy of the two alloys is investigated by combining compression on cylinders with elliptical sections, uniaxial tensile tests in different material directions, plane strain and shear tests. The initial anisotropy of the different alloys is very weak which justifies the modeling of the mechanical behavior with an isotropic yield surface. The identified elastoviscoplastic model is validated by comparing experimental results with FE predictions both on cylindrical notched specimens subjected to tensile tests and onflat specimens subjected to plane strain conditions

Modèles de nanostructures bimétalliques

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Modèles de nanostructures bimétalliques

Doctorat en Sciencesinfo:eu-repo/semantics/nonPublishe

Surface effects on structural and thermodynamic properties of Cu³Au nanoclusters

info:eu-repo/semantics/publishe

Micro-macro modeling of spheroidal cast iron: parameters identification by inverse analysis

In a previous study, a generic micro-macro mechanical model based on the coupling of an incremental mean-field model [1, 4, 5] with the Gurson-Tvergaard (GT) porous plastic law [2, 6] has been developed for the prediction of the mechanical properties of multiphase materials with a large volume fraction of voids. This model has been used in the framework of the FP6 PROHIPP European project to investigate the link between the microstructure and the mechanical properties of spheroidal cast iron. In this contribution, experimental results are presented and an inverse analysis procedure is proposed to adjust the parameters of the model

Surface effects on structural and thermodynamic properties of Cu 3Au nanoclusters

Semi-empirical potentials used for atomic scale modeling in metals are not designed for modeling low coordinance interactions. A popular second moment tights binding potential is revisited and modified for low coordinance systems. Cu3Au nanoclusters containing no more than a few hundred atoms are used as a case study. The parameterization of this potential is improved and a coordinance correction is presented, based on available experimental and ab initio data for reduced coordinance systems. It is found that a fine tuning of the parameters for bulk materials allows a significantly better description of the order-disorder transition, as predicted by Metropolis Monte Carlo simulations. Short range order does not vanish at high temperature. Accounting for a coordinance correction does not conclusively affect the structural and thermodynamic properties of the cluster cores. At equilibrium, cluster cores display the same stoichiometry as bulk Cu3Au and the surface gold segregation is a continuously decreasing function of temperature, irrespective of the first order-disorder phase transition in the cluster. © 2003 Elsevier B.V. All rights reserved.SCOPUS: cp.jinfo:eu-repo/semantics/publishe

Structural and thermodynamic properties of Ag-Co nanoclusters

info:eu-repo/semantics/publishe

Damage to fracture in 3D with XFEM

Nowadays, virtual testing is widely used in several sectors (automotive, aeronautics and space, nuclear, ...) as a mean to reduce product development time and cost. A large part of the virtual testing and simulation effort is dedicated to structural integrity assessment of parts. Continuum damage mechanics [1] and fracture mechanics [2] are two sciences that study the failure of materials in different ways. The former describes failure through the gradual reduction of the material properties (elastic or plastic) due to the development of spatially continuous damage, the latter would start from an existing macro-crack or discontinuity and use indicators of stress concentration or distribution to propagate the crack via an appropriate geometric update of the discontinuity. Recent attempts have tried to bridge the gap between damage initiation and crack propagation, using continuum damage mechanics until insertion of a discontinuity. The approach is appealing but it suffers from several difficulties (on top of the traditional difficulties associated with material softening): energetic equivalence, initial crack insertion criterion, initial crack shape and size definition. In this contribution, the level set method and eXtended Finite Element Method are used in combination with basic continuum damage mechanics to easily incorporate a discontinuity and allow for crack propagation. Starting from an uncracked / undamaged part, the method is able to model the whole failure history, from damage initiation to the propagation of a macro-crack. The method is demonstrated on several examples (metals and composites)