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.

A predictive model for the micro-porosity quantitative in Al-Si alloy

Battaglia, J.L., Rozot, J.M.

The fatigue is the most important criterion for the securities parts (brake system for example). The increasing use of shaped cast aluminium in the security automotive parts has focused interest on the fatigue of theses alloys. The specific foundry software use empirical laws that do not fit with the reality, above all concerning the aluminium alloys. We proposed a new physical parsimonious ...

Modeling dynamic of composite plate with PZT patches embedded by using FEMLAB3.1

Wang, J.
Mads Clausen Institute, University of Southern Denmark

As an important part of the smart/intelligent structures, the composite plate with piezoelectric-ceramics (PZT) patches embedded has numerous values in many engineering applications, such as: aerospace, automotive, civil and mechanical engineering. A composite thin plate excited by PZT actuators is considered in this work. To describe the dynamic response of the quadrate plate clamped at its ...

A Flexible Scheme For Numerical Homogenisation In Linear Elasticity

A. Gerisch[1], S. Tiburtius[1], Q. Grimal[2], and K. Raum[3]
[1]Technische Universität Darmstadt, Germany
[2]Université Pierre et Marie Curie Paris VI, France
[3]Charité-Universitätsmedizin Berlin, Germany

Musculoskeletal mineralised tissues (MMTs), like bone or tendon, are a prime example of naturally occuring, hierarchically structured material. They display a great variety in mechanical function but are all based on essentially the same building block: the mineralised collagen fibril (100 nanometer in diameter). This building block is arranged in various spatial structures across many length ...

FEM Simulations on the Effect of the Thermal-induced Surface Stress on Ultrathin Resonators

V. Pini, J. J. Ruz Martinez, E. Gil, M. Calleja, and J. Tamayo
Instituto de Microelectrónica de Madri
Madrid, Spain

The detection back-action phenomenon has received little attention in physical, chemical, and biological sensors based on nanomechanical systems. We show that this effect is very significant in ultrathin bimetallic cantilevers, in which the laser beam that probes the picometer scale vibration largely modifies the resonant frequencies of the system. The light back-action effect is nonlinear, ...

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 ...

A Discussion on Load Cell Practice Theory – Use COMSOL

W. L. Wang, W. H. Liao, and C. G. Zeng
Department of Mechanical Design Engineering, National Formosa University

Though used widely in weight measurement, load cell’s theory is tedious enough to practice. This paper explains and discusses how strain gauges and Wheatstone Bridges work, both of which are important components of the load cell. COMSOL Multiphysics applied to analyze the deformation of load cells, yields an accurate result verified by experiments, and demonstrates that a good load cell design ...

Design of an Autonomous Millimeter Scale Robot Using COMSOL

M.E. Karagozler, and S.C. Goldstein
Carnegie Mellon University, Pittsburgh, PA, USA

In this work, we describe the design of a new type of microrobot, the Catom, which is the basic unit of the modular robotic system Claytronics. The Catom is an autonomous, free standing, three dimensional microrobot, which uses electrostatically coupled electrodes to harvest power, actuate, and adhere to other robots. The Catoms are fabricated using lithography based fabrication techniques. The ...

Response of Structures to Transient Loading

R.D. Costley, H. Diaz-Alvarez, and M.H. McKenna
U.S. Army Corps of Engineers, Washington, DC, USA

Large infrastructure, such as bridges, emits signals at their natural or driven frequencies of vibration, providing an indication of the structural condition that can be monitored without a need to physically touch the structure. In this presentation, a benchmark case for the transient excitation of a simple structure is investigated: the COMSOL and analytical solutions are compared for the ...

Analysis Of The Design Criteria For Ancient Greek And Roman Catapults

K.M. Paasch
Center for Product Development, Mads Clausen Institute, South Danish University, Denmark

This paper will give a short overview of use of COMSOL Multiphysics for analyzing ancient Greek and Roman catapults with the main focus on the energy storing torsion springs. Catapults have been known and used in the Greek and Roman world from around 399 BC and a fully standardized design for powerful torsion catapults emerged around 270 BC, based on one basic factor, the diameter of the torsion ...

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 ...

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