Ici vous trouverez les présentations issues des Conférences COMSOL à travers le monde. Réalisées par des utilisateurs de COMSOL Multiphysics, ces présentations explorent tous les domaines actuels d'innovation. Les applications couvrent pratiquement tous les secteurs industriels et impliquent des phénomènes électriques, mécaniques, fluidiques et chimiques. Utilisez la recherche rapide pour trouver les présentations les plus intéressantes dans votre domaine d'intérêt.

Design of a Miniaturized RF MEMS Based Single-Bit Phase Shifter

A. Chakraborty, A. Kundu, S. Chatterjee, and B. Gupta
Jadavpur University
West Bengal, India

This paper presents a novel design of single-bit RF MEMS phase shifter. The basic novelty introduced for phase shifter design in this case, is by scaling down of the lateral dimensions of the conventional RF MEMS shunt switch by 10 times. The Mechanical and Electromechanical analysis of the designed miniature RF MEMS fixed-fixed beam is performed using COMSOL Multiphysics v.3.5a as an FEM ...

Numerically Closing the Loop of the Adaptive Optics Sensor: the Validation of the COMSOL Multiphysics® Simulation - new

C. Del Vecchio[1], R. Briguglio[1], A. Riccardi[1]
[1]National Institute for Astrophysics, Arcetri Astrophysical Observatory, Florence, Italy

As any other modelling of a physical behavior, the numerical simulation of the mechanical response of an adaptive secondary mirror requires that the results match the experimental data. Such an agreement was recently demonstrated for the local mirror stiffness of the LBT and VLT Deformable Mirrors; a reliable modeling is a good tool for the extrapolation of the missing optical data (spider ...

Stresses Due to Intercalation of Non-Spherical Lithium Storage Particles - new

R. Purkayastha[1], R. McMeeking[2]
[1]Cambridge University, Cambridge, UK
[2]University of California, Santa Barbara, CA, USA

Due to computational considerations most models of lithium storage particles in batteries incorporate spherical particles. However most storage particles used in battery electrodes tend to be irregular in shape with sharp edges and extended aspect ratios. The change of the relative surface area to the volume of the particle can lead to a change in the stress response of the particle for the same ...

Particle Focusing Optimization and Stress Analysis of a Magnetic Horn

S. di Luise[1], A. Rubbia[2]
[1]Swiss Federal Institute of Technology, ETH, Zurich, Switzerland and CERN European Organization for Nuclear Research, Geneva, Switzerland
[2]Swiss Federal Institute of Technology, ETH, Zurich, Switzerland

A neutrino oscillation experiment aims to the observation of the transformation of a neutrino of a given flavour into a neutrino of a different flavour. A beam of neutrinos is produced through the decay of charged pions which in turn are produced in the collision of high energy accelerated protons impinging on a thick target. A series of magnetic horns is used to focus charged particles produced ...

Modelling Failure Mechanims in Sands Under Extreme Loads Using COMSOL

J. Mwebesa, D. Kalumba, and R. Kulabako
Makerere University
Kampala, Uganda

Studies by Nishaat (2009) showed that Terzaghi\'s bearing capacity model didn\'t adequately predict the bearing capacity failure in Philippi Dune sands. Nishaat carried out her investigation using a physical model that was built in a geotechnical laboratory. The failure surfaces she observed in the sands did not resemble those predicted by Terzaghi and Meyerhof\'s models. However the use of a ...

Earth Pressure as a Boundary Condition to Bridge Piers and Abutments

M. Quinn[1], D. Whitlow[1], O.D.S. Taylor[1], M.H. McKenna[1]
[1] Engineer Resource and Development Center, United States Army Corps of Engineers, Vicksburg, MS, USA

Bridge piers and abutments makeup the bridge substructure and transmit loads from the superstructure to the bridge foundation material (Figure 1). The bridge abutment serves three purposes: to provide vertical support to the bridge superstructure where the bridge ends, to connect the bridge with the approach roadway, and to retain roadway base materials. There are several types of abutment ...

Structural Analysis of a Pressure Sensor for High Temperature Environments

S.V. De Guido[1], G.S. Masi[1], P. Vladimirovich Miodushevsky[1], L. Vasanelli[1]
[1]Department of Innovation Engineering, University of Salento, Lecce, Italy

Pressure sensors operating at the temperature higher that 500 °C are absent in the world market. Our goal is to develop a pressure sensor that can operate at the high temperature up to 700 °C. Our sensor will be made up of a ceramic sensible element and a metallic case. The sensible element will be a ceramic beam with a Weathstone bridge on its surface. A structural analysis on the case has been ...

Punch Design for Uniaxial Forging Process of γ-TiAl Using COMSOL Multiphysics®

R. Cagliero[1] and G. Maizza[1]
[1]Dipartimento di Scienza dei Materiali ed Ingegneria Chimica, Politecnico di Torino, Torino, Italy

The increasing demand for improved metallurgical products strongly motivates the optimization of manufacturing processes and design of γ-TiAl products. Among the large variety of available forming processes, cold closed-die forging is particularly suitable for producing net shape bulk products having good surface finish with better mechanical properties. Pressing punches of suitable ...

Study of Hard-and Soft- Magnetorheological Elastomers (MRE’s) Actuation Capabilities

J. Roche[1], P. Von Lockette[1], and S. Lofland[2]
[1]Mechanical Engineering Dept., Rowan University, Glassboro, NJ
[2]Physics and Astronomy Dept., Rowan University, Glassboro, NJ

In this study, magneto-rheological elastomer (MRE) composite beams made of Barium hexaferrite (BaM) and Iron (Fe) powders combined with a highly-compliant matrix material were simulated using COMSOL\'s Solid Mechanics and AC/DC modules. The goal of the work was to develop models capable of predicting the actuation behavior of hard- and soft-magnetic MREs. This work simulates the bending of ...

Design Geometry Optimization of Vertical Cracks in Thermal Barrier Coatings from Simulated Thermal and Mechanical Behavior

C. Heveran[1], J. Xu[1], D. Cole[2], S. Basu[1], V. Sarin[1]
[1]Division of Materials Science and Engineering, Boston University, Brookline, MA, USA
[2]Department of Mechanical Engineering, Boston University, Brookline, MA, USA

Turbine blades are coated with thermal barrier coatings (TBCs) to reduce operating temperature. TBCs experience stress from coefficient of thermal expansion mismatch with the bond-coat and substrate. Vertical cracks are thought to offer stress relief, but influence of crack geometry on TBC thermal and mechanical properties is not well understood. A two-dimensional, steady-state model is employed ...