Gilles Besnard

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A new methodology is proposed to estimate displacement fields from pairs of images (reference and strained) that evaluates continuous displacement fields. This approach is specialized to a finite-element decomposition, therefore providing a natural interface with a numerical modeling of the mechanical behavior used for identification purposes. The method is(More)
A study of nuclear and cytoplasmic genetic diversity of cultivated olive, oleaster and other taxa belonging to the complex O. europaea was performed. Nuclear DNA polymorphism (RAPDs) in oleaster displays a gradient between the east and west of the Mediterranean Basin. In cultivars, the gradient is less visible owing to their diffusion and selection.(More)
Invasion of new territories by insect vector species that can transmit pathogens is one of the most important threats for human health. The spread of the mosquito Aedes albopictus in Europe is emblematic, because of its major role in the emergence and transmission of arboviruses such as dengue or chikungunya. Here, we modeled the spread of this mosquito(More)
Sprays of commercial preparations of the bacterium Bacillus thuringiensis subsp. israelensis are widely used for the control of mosquito larvae. Despite an abundant literature on B. thuringiensis subsp. israelensis field efficiency on mosquito control, few studies have evaluated the fate of spores in the environment after treatments. In the present article,(More)
  • 2007
Over ten years, several European teams have characterised polymorphism in the olive chloroplast genome (cpDNA). A particularly low level of cpDNA polymorphism was detected; but, in a recent study based on 14 Mediterranean trees, an intergenic (trnD-trnT) spacer was reported to be sufficiently variable to distinguish at least six haplotypes in cultivated(More)
At a certain value of the macroscopic applied strain, most metallic materials experience strain localization in a small region of the tested sample. The topology and the size of this region strongly depends on the microstructure of the material [1–4]. Thus depending on the scale at which localization is modeled, various computational methods have been(More)
Most often, Digital Image Correlation (DIC) is used to analyze a sequence of images. Exploitation of an expected temporal regularity in the displacement fields can be used to enhance the performances of a DIC analysis, either in terms of spatial resolution, or in terms of uncertainty. A general theoretical framework is presented, tested on artificial and(More)
Abstract The purpose of the experiment described herein is the study of material deformation (here a cylinder) induced by explosives. During its expansion, the cylinder (initially 3 mm thick) is thinning until fracture appears. Some tens of microseconds before destruction, strain localizations occur and induce mechanical necking. To characterize the time of(More)
Volumetric strains in a filled SBR specimen subjected to cyclic uniaxial tension with increasing extensions are studied. Digital image correlation is used to follow the kinematics of two orthogonal free faces. A volume expansion is observed past a critical elongation, which can be interpreted as the onset of cavitation. Under unloading, the volume returns(More)
  • Benôıt Beaubier, Karine Lavernhe Taillard, +7 authors Louis Bréguet
  • 2017
The aim of this study is to predict the strains induced by welding-brazing of automotive thin metal sheets using finite elements simulations. In order to validate the simulations, experimental tests on industrial parts are carried out. One goal of these tests is to determine 3D surface displacement fields during welding. The measurement technique chosen for(More)
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