Déformations des couches bitumineuses au passage d'une charge de trafic

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Structural stability issues in planar solid oxide fuel cells (SOFC) arise from the mismatch between the coefficients of thermal expansion (CTE) of the components. The stress state at operating temperature is the superposition of several contributions, which differ depending on the component. First, the cells undergo residual stresses due to the sintering phase during the manufacturing process. Furthermore, the load applied during the assembly of the stack to ensure the electric contact and flatten the cells

In the framework of the INTERREG IIIb NWE project « Strategies and Actions for Flood Risk Management » (SAFER), a regional streambank erosion hazard model has been developed. This diagnostic model is tested on the Lauter River in Germany. Shear stress maps of the Lauter River are produced. These shear stress maps can be used as a diagnostic tool for prioritizing erosion prone rivers. More testing of the model needs to be done using more geological information and more hydraulic results from a large region.

In an effort to better understand the plasticity of tempered martensitic steels, uniaxial tension and compression tests were carried out. The temperature dependence of both the yield stress and the post-yield stress behavior were compared, and it was shown that a good correspondence exists between tensile and compressive behavior. The strain-hardening of EUROFER 97 steel was examined in terms of dislocation mechanics. A simple strain-hardening law was established within the framework of a model accounting f

Constant strain-rate and creep tests have been performed on poly-quasicrystalline specimens of the icosahedral Al-Cu-Fe system. Three temperatures (870, 960 and 1000 K) have been investigated by creep for samples predeformed at constant strain-rate before and beyond the upper yield stress, over the stress range 30-320 MPa. The influence of the creep stress level and plastic strain amount on the stress-strain curve has also been studied when the samples are deformed again at constant strain rate. Depending o

The use of a tetrafunctional epoxy-based additive to modify the molecular structure of poly(ethylene terephthalate) (PET) was investigated with the aim of producing PET foams by an extrusion process. The molecular structure analysis and shear and elongation rheological characterization showed that branched PET is obtained for 0.2, 0.3 and 0.4 wt% of a tetrafunctional epoxy additive. Gel permeation chromatography (GPC) analysis led to the conclusion that a randomly branched structure is obtained, the structu

Advanced Traveler Information Systems (ATIS) and Advanced Traffic Management Systems (ATMS) have the potential to contribute to the solution of the traffic congestion problem. DynaMIT is a real-time system that can be used to generate guidance for travelers. The main principle on which DynaMIT is based is that information should be consistent, and user optimal. Consistency implies that the traffic conditions experienced by the travelers are consistent with the condition assumed in generating the guidance. T

Nowadays, many applications need data modeling facilities for the description of complex objects with spatial and/or temporal facilities. Responses to such requirements may be found in Geographic Information Systems (GIS), in some DBMS, or in the research literature. However, most of existing models cover only partly the requirements (they address either spatial or temporal modeling), and most are at the logical level, hence not well suited for database design. This paper proposes a spatio-temporal modeling

Ligaments play a central role in the stability of the knee. Due to the increase in sport activities of the young population, rupture of the anterior cruciate ligament (ACL) has become a frequent clinical problem. A surgical procedure replacing the deficient ligament is performed to restore the knee's initial stability. Although this surgical technique is widespread and well established, long term clinical results are inconsistent and the stability of the knee is not always restored, leading to premature art

A three-dimensional finite element model of the carotid artery bifurcation was constructed in order to determine the stress field and assess the modification of the stress field when residual strain is taken into account. Residual strain in the carotid bifurcation was characterized by experimental observations. According to these observations, a geometrical model of the carotid artery was constructed to exhibit a state free of strain. Appropriate boundary conditions were applied to yield the correct geometr

We have examined the role of the nonlinear elastic properties of the arterial wall on the human aortic input impedance obtained at different heart rates and different pressure and flow wave shapes. Pressure and flow were taken from a computer model that provides realistic simulations of the nonlinear distributed systemic arterial tree. Different wave shapes of ascending aorta pressure and flow and different heart rates were used to derive input impedance moduli and phase angles via Fourier analysis. The res

Déformations des couches bitumineuses au passage d'une charge de trafic

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Simulation of Thermal stresses in anode-supported solid oxide fuel cell stacks

Shear stress mapping on the Lauter river

On the mechanical properties of the advanced martensitic steel EUROFER 97

Plastic behaviour of icosahedral Al-Cu-Fe quasicrystals: Experiment and modelling

Molecular characterization and rheological properties of modified poly(ethylene terephthalate) obtained by reactive extrusion

Network state estimation and prediction for real-time transportation management applications

Spatio-Temporal Conceptual Models: Data Structures + Space + Time

Viscoelastic properties of soft tissues : application to knee ligaments and tendons

Residual strain effects on the stress field in a thick wall finite element model of the human carotid bifurcation

Scatter in input impedance spectrum may result from the elastic nonlinearity of the arterial wall