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All posts by Henrik Sönnerlind

Can a Stiffness Be Negative?

December 5, 2016

Have you ever encountered an FEM formulation where the force does not monotonically increase with displacement? We discuss some examples of this behavior: negative stiffness.

How to Model Adhesion and Decohesion in COMSOL Multiphysics

July 28, 2016

Did you know you can simulate objects that stick together once they come in contact (adhesion) as well as those that pull apart (decohesion), including full cohesive-zone modeling?

How to Make Boundary Conditions Conditional in Your Simulation

June 27, 2016

In some modeling scenarios, you may want to apply a boundary condition to only part of the geometrical boundary or only under certain conditions. Learn how to do so here.

Modeling the Dynamics of a Gyroscope

December 22, 2015

Gyroscopes and spinning tops aren’t just old-fashioned toys. Using models of these 2 structures, we illustrate the remarkable properties of rotating bodies.

What Is Geometric Nonlinearity?

September 14, 2015

If you perform structural mechanics analyses, then you have most likely encountered the concept of geometric nonlinearity. But what exactly does geometric nonlinearity mean?

Modeling Linear Elastic Materials – How Difficult Can It Be?

June 29, 2015

Get an intro to the theory and application of the linear elastic material model, isotropy/anisotropy, allowable values for material data, incompressibility, and geometric nonlinearity.

Singularities in Finite Element Models: Dealing with Red Spots

June 3, 2015

Seeing red? Explore common causes of singularities in your finite element models, as well as when and how to remove them and how to interpret your simulation results.

Part 2: Obtaining Material Data for Structural Mechanics from Measurements

May 5, 2015

Learn how to use nonlinear elastic and elastoplastic materials, as well as a method for using your measured data directly in COMSOL Multiphysics®. Part 2 of a series on hyperelastic materials.