Technical Papers and Presentations

Here you will find presentations given at COMSOL Conferences around the globe. The presentations explore the innovative research and products designed by your peers using COMSOL Multiphysics. Research topics span a wide array of industries and application areas, including the electrical, mechanical, fluid, and chemical disciplines. Use the Quick Search to find presentations pertaining to your application area.

Modeling of Vickers indentation of TiAl alloys

G. Maizza, and R. Cagliero
Politecnico di Torino, Corso Duca degli Abruzzi 24, Torino, Italy

Instrumented indentation is increasingly used as an alternative non-destructive test method to measure mechanical properties of small volumes of materials. In this work, the instrumented indentation test is applied as a non-destructive method to assess the mechanical properties of TiAl components during the setup of a real production process. This study is a preliminary contribution devoted to ...

Electro-Thermo-Mechanical Finite Element Modeling to Investigate the Reliability of Automotive MOSFET Transistor

T. Azoui, P. Tounsi, and J.M. Dorkel
CNRS, LAAS, Toulouse, France

3D electro-thermo-mechanical finite element model of power vertical MOSFET used in the automotive industry is presented in this paper. The presented paper is a qualitative study of power device results from electro-thermo-mechanical simulation. This study particularly interested in the stress generated at the interface between the bonding wires and the source metallization to evaluate the ...

Numerical modelling of the damage potential of climate variations to a historic wooden cabinet

Z. Huijbregts, H. Schellen, and J. van Schijndel
Department of the Built Environment
Eindhoven University of Technology
Eindhoven, The Netherlands

The two wooden cabinets of Jan van Mekeren that are located in Amerongen Castle show comparable wood damage; in particular large cracks in the cabinet doors are clearly noticeable. It is assumed that these cracks were caused by bad indoor climate conditions in the castle. Combined computational modelling of the indoor climate conditions in the castle and the hygroscopic and mechanical ...

Modeling of Chemo-Mechanical Coupled Behavior of Cement Based Material

D. Hu[1], F. Zhang[2], H. Zhou[3], and J. Shao[1]
[1]LML, UMR8107, CNRS, University of Lille I, Lille, France
[2]School of Civil Engineering and Architecture, Hubei University of Technology, Wuhan, China
[3]State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, China

A lixiviation-mechanical coupled model is developed for fiber reinforced concrete within this framework; both the influence of chemical degradation on short and long term mechanical behavior and the influence of mechanical loading on the diffusion coefficient can be considered. The elastic mechanical properties are written as function of chemical damage. A Drucker–Prager typed criterion with ...

Finite Element Approach for the Analysis of the Fuel Cell Internal Stress Distribution

E. Firat, P. Beckhaus, and A. Heinzel
Zentrum für BrennstoffzellenTechnik (ZBT)
Duisburg, Germany

A fuel cell stack is a setup of a number of single fuel cells which have to be mechanically compressed each other to ensure good electrical conductivities and tightness against leakage of supplying gases (e.g. hydrogen) and cooling media. In this study a 3D FEM model is developed with COMSOL Multiphysics® to analyze the mechanical design of a fuel cell stack. The material properties of the ...

Quantitative Nanomechanics on Thin Samples with the Atomic Force Microscope

J. P. Müller, and T. E. Schäffer
Institute of Applied Physics
University of Erlangen-Nuremberg
Erlangen, Germany

One method for investigating the mechanical properties of samples like living cells with an Atomic Force Microscope (AFM) is driving force-curves, i.e. measuring the force applied by the tip of the AFM as a function of the indentation into the sample. By fitting a Hertz-model, which predicts the applied force as a function of the indentation depth, one can infer the elastic modulus of the ...

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 ...

Influence of Vickers Indenter Tip Geometry on the Macro-indentation Properties of TiAl Alloys

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

In this work the influence of the geometry of the Vickers indenter tip on relevant indentation properties is investigated during instrumented indentation operated in the macro range (i.e. with forces ranging from 2 to 200 N) and carried out in the case of a homogenized (i.e. heat treated) TiAl alloy. The instrumented macro-indentation test is simulated by Comsol Multiphysics using a full 3D ...

A Simplified Approach to the Contact in Thermo-mechanical Analysis of Refractory Linings

Y. Kaymak
VDEh Betriebsforschungsinstitut GmbH
Düsseldorf, Germany

The geometrical design and material choice for a refractory lining requires a good understanding of its thermo-mechanical behavior. Design engineers clearly need a tool for fast and efficient computation of thermo-mechanical state of refractory linings under various conditions. However, standard simulation models and their solutions suffer as the linings are composed of many refractory blocks in ...

Numerical Experiments for Thermally-induced Bending of Nematic Elastomers with Hybrid Alignment

L. Teresi[1], and A. DeSimone[2]
[1]LaMS - Modeling & Simulation Lab, University Roma Tre, Roma, Italy
[2]SISSA - International School for Advanced Studies, Trieste, Italy

We deal with Liquid Crystal Elastomers (LCEs) having hybrid alignment (HNEs), that is, fabricated with a given non-homogeneous nematic orientation. For such a materials, permanent distortions induced by deswelling can be compensated by those resulting from cooling below the transition temperature, thus yielding the possibility of producing temperature-driven actuators. Here, we simulate the ...

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