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Stress or strain on a boundary

Posted 28.03.2020, 04:36 GMT-4 Structural & Acoustics Version 5.5 2 Replies

Jarne Berentsen
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Hello,

I'm trying to find out what the effect of 'holes' in a hydrogel is on the modulus of that gel. For this reason, I simulated the gel in 2D as a square block. On this block, I want to apply a shear or stress on the upper boundary in the x-direction, but I cannot find the boundary condition for this. How do I apply a shear or stress on a boundary?

Kind regards

2 Replies Last Post 30.03.2020, 10:02 GMT-4
Henrik Sönnerlind COMSOL Employee

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Posted: 5 years ago 30.03.2020, 02:17 GMT-4

Hi Jarne,

In the Boundary Load node you can apply an arbitrary traction. You cannot directly prescribe a strain, but through Prescribed Displacement you can in principle do that.

However, from how you describe your problem, I think Cell Periodicity may be the feature you are really looking for. It is intended for computing effective moduli of unit cells of an inhomogeneous material .

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Henrik Sönnerlind
COMSOL
Hi Jarne, In the *Boundary Load* node you can apply an arbitrary traction. You cannot directly prescribe a strain, but through *Prescribed Displacement* you can in principle do that. However, from how you describe your problem, I think *Cell Periodicity* may be the feature you are really looking for. It is intended for computing effective moduli of unit cells of an inhomogeneous material .
Jarne Berentsen
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Posted: 5 years ago 30.03.2020, 10:02 GMT-4

Hi Hendrik,

Thank you very much for your reply! It is very helpful!

Hi Hendrik, Thank you very much for your reply! It is very helpful!

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