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Structural Mechanics

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Temperature Dependent Material PropertiesTemperature Dependent Material Properties

Jahm Software Inc., MA, USA
It is common to use data at room temperature in a simulation because elevated temperature data could not be found. However, the effects of temperature on a...

Modeling Improves Prediction of Semiconductor LifetimesModeling Improves Prediction of Semiconductor Lifetimes

STMicroelectronics
With the scaling down of semiconductor devices, current density in the metal interconnects joining individual transistors increases. Up to now, lifetime...

Joined at the HipJoined at the Hip

Tulane University, New Orleans, LA
As part of a course in biomedical engineering, Dr. Hart gives assignments that require the students to create models in COMSOL Multiphysics. In addition,...

Peering into the Mouth of a VolcanoPeering into the Mouth of a Volcano

FEMLAB GmbH, Zürich, Switzerland
A group of scientists from three institutions are researching how to use information about electromagnetic fields in volcanoes to investigate and observe...

Spinning Threads of the Tiniest Size ImaginableSpinning Threads of the Tiniest Size Imaginable

Chemical Engineering Department, The Lund Institute of Technology, Lund, Sweden
The process of manufacturing nanowires-the smallest possible threads-is not wholly understood. Prof. Stig Stenström of Lund University in Sweden created a...

ArcelorMittal Breaks Down the Physics of CorrosionArcelorMittal Breaks Down the Physics of Corrosion

Arcelormittal, France
Researchers at Arcelormittal, France use modeling with COMSOL to better understand the mechanism behind delamination and underpaint corrosion and determine...

Reduced Stresses Inside Semiconductor Chips Lead to Higher ReliabilityReduced Stresses Inside Semiconductor Chips Lead to Higher Reliability

STMicroelectronics, Milan, Italy
A team from STMicroelectronics and Technoprobe, Italy joined together to investigate what happens when a probe tip hits a conductive pad surface. Limiting...

Multiphysics Modeling Studies New Materials that Could Revolutionize Solar EnergyMultiphysics Modeling Studies New Materials that Could Revolutionize Solar Energy

Fraunhofer Institute For Solar Energy Systems, Freiburg, Germany
Researchers at the Fraunhofer Institute For Solar Energy Systems use modeling with COMSOL to compare different polymeric collector geometries and materials...

Example Models

Semiconductor DiodeSemiconductor Diode

A semiconductor diode consists of two regions with different doping: a p-type region with a dominant concentration of holes, and an n-type region with a dominant concentration of electrons. The model presented here formulates the...

Electrokinetic and Magnetic Fields Inside a VolcanoElectrokinetic and Magnetic Fields Inside a Volcano

This example demonstrates how to model electrokinetic voltages generated by fluid flowing through porous media and the magnetic fields that result from the electric current. Here rainfall infiltrates into the porous conduit of a...

Distributed SPICE Model of Bipolar TransistorDistributed SPICE Model of Bipolar Transistor

Integrated semiconductor devices are used in almost all electrical equipment, and the bipolar junction transistor (BJT) is still a very important device although the MOS technology has taken over a large part of the market. Especially in...

Comb DriveComb Drive

Rectangular comb drives are used in a variety of applications in MEMS systems. This is a model of an electrostatically-actuated comb drive used to open and close a pair of microtweezers. Because electrostatic forces attract the combs...

Blood VesselBlood Vessel

This model refers to a portion of the vascular system of a young child - the upper part of the aorta artery. The blood vessels are embedded in a biological tissue (the cardiac muscle) and, during the flow of blood, pressure is applied to...

Failure of a Multilateral WellFailure of a Multilateral Well

An increasingly common technique to maximize oil production from deep wellbores is to emplace "open" multilateral wells, with multiple legs that branch off of a single conduit. The down side of leaving the well open is a high risk of...

MOS Transistor ModelMOS Transistor Model

The MOSFET (Metal Oxide Semiconductor Field-Effect Transistor) is by far the most common semiconductor device, and the primary building block in all commercial processors, memories, and digital integrated circuits. During the past decades...

Simulation of a Microrobot, 3DSimulation of a Microrobot, 3D

A microrobot's leg, which structurally moves due to the rapid application of heat, is modeled in this example. Heat is generated by an electric current and propagates by conduction through the leg and, due to thermal expansion and...

Modal Analysis of a CrankshaftModal Analysis of a Crankshaft

This model describes a modal analysis of a crankshaft. The pistons’ reciprocating movement is transferred to the crankshaft through connecting rods by means of crankshaft throws. The forces, torques, and bending moments, which are...

Squeezed-Film Gas Damping in an AccelerometerSqueezed-Film Gas Damping in an Accelerometer

Squeezed-film gas damping is a critical aspect of many MEMS transducers and actuators. In accelerometers, for example, inertia produces a motion that the device detects. A typical structure connects a large proof mass to surrounding...

Piezo-Acoustic TransducerPiezo-Acoustic Transducer

People that use piezoelectric transducers are interested in phased-array microphone, ultrasound equipment, ink-jet drop actuators, drug discovery, Sonar transducers, bio-imaging and acousto-bio-theraputics. Basically anyone who is trying...

Piezoresistive Elevator ButtonPiezoresistive Elevator Button

This example shows a model of a piezoresistive in-wall elevator button. It was designed with the following requirements in mind: durability with respect to high temperatures capability of producing signals that can be easily used in...

Plastic Deformation during the Expansion of a StentPlastic Deformation during the Expansion of a Stent

Percutaneous transluminal angioplasty with stenting is a widely used method for the treatment of atherosclerosis. During this procedure a stent is deployed into the blood vessel by means of a balloon. The expanded stent acts as a scaffold...

Viscoelastic Structural DamperViscoelastic Structural Damper

Damping elements involving layers of viscoelastic materials are often used for reduction of seismic and wind induced vibrations in buildings and other tall structures. The common feature is that the frequency of the forced vibrations is...

Nonlinear Magnetostrictive TransducerNonlinear Magnetostrictive Transducer

Magnetostrictive transduction is used in sonars, acoustic devices, active vibration and position control and fuel injection systems. The transducer has a steel housing enclosing a drive coil. A magnetostrictive material is placed in the...