Coupling between 1D beam elements and 3D solid elements for the modelling of fiber-reinforced composites

International audienc

Coupling 1D beam elements with 3D solid elements for the modelling of fibre-reinforced composites

International audienc

On the geometrical origin of the anisotropy in extrusion-based 3d printed structures

International audienceStructures that are 3D printed by an extrusion process have periodic geometrical heterogeneity whose influence on the final stiffness properties is not extensively discussed in the existing literature. The objective of this article is to quantify the effect of local lace geometry on the anisotropy of extrusion-based 3d printed structures. A numerical homogenisation scheme is implemented to compute an equivalent homogeneous Kirchhoff-Love plate stiffness. The methodology is applied to the parametric study of an oblong lace resulting from oriented-lace pressing. The study reveals that the bending stiffness in the two principal directions may vary by an order of magnitude for common lace geometries, even in the assumption of a perfect bound between layers. Numerical benchmarks against 3D Finite Element Analysis show that the proposed approach is accurate while significantly decreasing the number of degrees of freedom of the numerical model. Beyond understanding of geometrical defects on the overall stiffness of 3D printed structures, this approach can thus be applied for efficient structural analysis of 3D printed pieces with thousands of layers

French ichthyological records for 2019

WOS:000715836000001International audienceUncommon fish records may reflect local or global changes of fish composition resulting from environmental changes or anthropog,enic activities. Significant records of uncommon marine fishes, including migrant, non-native, cryptic, rare and threatened species, collected in French waters or by French vessels in European waters, observed by scuba divers or beachgoers, are reported for the year 2019. They include first, new, rare and unusual records for the following 33 species: Tetronarce nobiliana, Gymnothorax unicolor, Maulisia mauli, Salmo trutta, Grammonus aler, Photostomias guernei, Ifintaia loppei, Echiodon drummondii, Holocentrus adscensionis, Nerophis lumbriciformis, Scorpaena scrofa, Lepidoirigla dieuzeidei, Eutelichthys leptochirus, Liparis montag tti, Mycteroperca rubra, Serranus cabrilla, Remora remora, Caram: crysos, Naucrates doctor, Trachurus picturatus, Seriola rivoliana, Argyrosomus regius, Parablennius pilicornis, Pseudoscopelus astronesthidens, Deltentosteus collonianus, Didogobius schlieweni, Didogobius splechinai, Gobius couchi, Gobius f.;asteveni, Lebetus guilleti, Synapturichthys kleinii, Lagocephalus lagocephalus and 21.1ola mola, among which I. loppei, H. adscensionis and P. astronesthidens represent first records for the French waters and additions to the Checklist of the marine fishes from metropolitan France. Photostomias guernei is a first record for the Bay of Biscay, found close the French ETV,

Low incidence of SARS-CoV-2, risk factors of mortality and the course of illness in the French national cohort of dialysis patients

International audienceThe aim of this study was to estimate the incidence of COVID-19 disease in the French national population of dialysis patients, their course of illness and to identify the risk factors associated with mortality. Our study included all patients on dialysis recorded in the French REIN Registry in April 2020. Clinical characteristics at last follow-up and the evolution of COVID-19 illness severity over time were recorded for diagnosed cases (either suspicious clinical symptoms, characteristic signs on the chest scan or a positive reverse transcription polymerase chain reaction) for SARS-CoV-2. A total of 1,621 infected patients were reported on the REIN registry from March 16th, 2020 to May 4th, 2020. Of these, 344 died. The prevalence of COVID-19 patients varied from less than 1% to 10% between regions. The probability of being a case was higher in males, patients with diabetes, those in need of assistance for transfer or treated at a self-care unit. Dialysis at home was associated with a lower probability of being infected as was being a smoker, a former smoker, having an active malignancy, or peripheral vascular disease. Mortality in diagnosed cases (21%) was associated with the same causes as in the general population. Higher age, hypoalbuminemia and the presence of an ischemic heart disease were statistically independently associated with a higher risk of death. Being treated at a selfcare unit was associated with a lower risk. Thus, our study showed a relatively low frequency of COVID-19 among dialysis patients contrary to what might have been assumed