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Affichage de 2361 à 2370 sur 6528

Article dans une revue

Towards the Numerical Prediction of Galling Onset in Cold Forming

Oussama Filali, André Dubois, Laurent Dubar, Mirentxu Dubar

Aluminum alloys are materials that have a strong tendency to galling when they are cold formed. Caused by a breakdown of the lubricant film between the part and the tool, galling can have dramatic consequences on the forming operation: scratches and cracks in the surface of the piece, clogging and…

Key Engineering Materials, 2018, 767, pp.103-110. ⟨10.4028/www.scientific.net/KEM.767.103⟩. ⟨hal-03450907⟩

Article dans une revue

Geometrically nonlinear bending analysis of functionally graded beam with variable thickness by a meshless method

Jun Lin, Jiao Li, Yanjin Guan, Guoqun Zhao, Hakim Naceur, Daniel Coutellier

Geometrically nonlinear bending deformation of Functionally Graded Beams (FGBs) with variable thickness is simulated by a meshless Smoothed Hydrodynamic Particle (SPH) method. The material properties of FGB is assumed to be varied smoothly in the thickness according to exponent-law distribution. To…

Composite Structures, 2018, 189, pp.239-246. ⟨10.1016/j.compstruct.2018.01.063⟩. ⟨hal-03450880⟩

Article dans une revue

Quantitative Evolution of WC-Co Cemented Carbide Tool Surface during the Cold Forming of Steel Parts

Laurent Dubar, Colin Debras, Mirentxu Dubar, André Dubois

The present paper investigates the evolution of the WC grain size and morphology with the number of produced parts. Four reduction dies used in cold forward extrusion of steel are taken from the production line: a brand new die and three dies which have respectively produced 100.000, 150.000 and…

Key Engineering Materials, 2018, 767, pp.290-297. ⟨10.4028/www.scientific.net/KEM.767.290⟩. ⟨hal-03450818⟩

Communication dans un congrès

[Invited] Study of the spectral bandwidth of a double-pass acousto-optic system

Justine Champagne, Jean-Claude Kastelik, Samuel Dupont, Joseph Gazalet

Acousto-optic tunable filters are known as efficient instruments for spectral and spatial filtering of light. In this paper, we analyze the bandwidth dependence of a double-pass filter. The interaction geometry chosen allows the simultaneous diffraction of the ordinary and the extraordinary optical…

13th School on Acousto-Optics and Applications, Jun 2017, Moscow, Russia. pp.C49-C55. ⟨hal-03549258⟩

Communication dans un congrès

MIP formulations for identical parallel machine scheduling problem with single server

Abdelhak El Idrissi, Rachid Benmansour, Mohammed Benbrahim, David Duvivier

This paper considers the problem of scheduling a set of independent jobs on an arbitrary number of identical parallel machines with setup consideration and a makespan objective. The setup operations are performed by one available server. We propose two mixed integer programming (MIP) formulations…

2018 4th International Conference on Optimization and Applications (ICOA), Apr 2018, Mohammedia, Morocco. pp.1-6, ⟨10.1109/ICOA.2018.8370596⟩. ⟨hal-03383549⟩

Article dans une revue

Optimization of SAW-type Surface Wave Ultrasonic Sensors for Ultrasonic SHM

Rafatou Takpara, Marc Duquennoy, Mohammadi Ouaftouh, Christian Courtois, Frédéric Jenot, Mohamed Rguiti

Surface acoustic waves (SAW) are particularly suited for effectively monitoring and characterizing a structure’s surfaces (condition of the surface, coating, thin layer, micro-cracks, etc.), and in some cases it is necessary to permanently keep the sensors on the structures to enable continuous…

Research in Nondestructive Evaluation, 2018, 29 (2), pp.61-77. ⟨10.1080/09349847.2016.1252870⟩. ⟨hal-03117425⟩

Communication dans un congrès

Wavelength characterization of an acousto-optic notch filter for unpolarized near-infrared light

Jean-Claude Kastelik, Justine Champagne, Samuel Dupont, Konstantin B. Yushkov

A cascaded system of two acousto-optical cells is proposed and experimentally demonstrated for optical notch rejection filtering in the spectral range from 1400 nm to 1600 nm. Two similar paratellurite acousto-optical devices for unpolarized light are used in a free-space gap of a fiber line.…

13th School on Acousto-Optics and Applications, Jun 2017, Moscow, Russia. pp.C36-C41. ⟨hal-03549268⟩

Article dans une revue

Modeling the viscoplastic flow behavior of a 20MnCr5 steel grade deformed under hot-working conditions, employing a meshless technique

Juan Carlos Álvarez-Hostos, Alfonso D. Bencomo, Eli Saúl Puchi-Cabrera, Jean-Dominique Guerin, Laurent Dubar

The present work has been conducted in order to develop a novel approach to predict the inhomogeneous flow of a 20MnCr5 steel during an axisymmetric hot compression test, by using the element-free Galerkin (EFG) method under a differential constitutive description. The governing equations have been…

International Journal of Plasticity, 2018, 103, pp.119-142. ⟨10.1016/j.ijplas.2018.01.005⟩. ⟨hal-03450115⟩

Article dans une revue

Lagrangian submanifolds with constant angle functions of the nearly Kähler S3 × S3

Burcu Bektaş, Marilena Moruz, Joeri van Der Veken, Luc Vrancken

We study Lagrangian submanifolds of the nearly Kähler S3 × S3 with respect to their so called angle functions. We show that if all angle functions are constant, then the submanifold is either totally geodesic or has constant sectional curvature and there is a classification theorem that follows…

Journal of Geometry and Physics, 2018, 127, pp.1-13. ⟨10.1016/j.geomphys.2018.01.011⟩. ⟨hal-03233861⟩

Article dans une revue

Friction and Wear in Metal Forming: 25 Years at LAMIH UMR CNRS 8201

Laurent Dubar, André Dubois, Mirentxu Dubar

Since the beginning of the 90’s, research activities focused on friction and wear in metal forming have been developed at the LAMIH UMR CNRS 8201 in Valenciennes. Specific methodologies have been designed to optimize a given forming process (bulk forming process or sheet forming process). These…

Key Engineering Materials, 2018, 767, pp.42-58. ⟨10.4028/www.scientific.net/KEM.767.42⟩. ⟨hal-03450663⟩