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Little Surface to apply a force

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Hello everyone, someone knows how to create a primitive area on a plate on which apply the force? In other words I don't want to apply the force on a point but on an area. Thank you in advance!


1 Reply Last Post Jan 18, 2022, 2:17 a.m. EST
Henrik Sönnerlind COMSOL Employee

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Posted: 2 years ago Jan 18, 2022, 2:17 a.m. EST
Updated: 2 years ago Jan 18, 2022, 2:18 a.m. EST

Maybe it is even easer to apply the load on a small area that is not part of the geometry? Use a boundary load / face load with an expression like

10[MPa]*(X>X_min)*(X<X_max)*(Y>Y_min)*(Y<Y_max)
for a rectangular patch

or

10[MPa]*(((X-X_c)^2+(Y-Y_c)^2)<R_patch^2)
for a circular patch.

Note that when using mesh independent loads like this, it can be a good idea increase the integration order for the load; see the discussion in https://www.comsol.com/blogs/introduction-to-numerical-integration-and-gauss-points.

You can even distribute the force over the patch, like in the first example in https://www.comsol.com/blogs/how-to-make-boundary-conditions-conditional-in-your-simulation.

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Henrik Sönnerlind
COMSOL
Maybe it is even easer to apply the load on a small area that is not part of the geometry? Use a boundary load / face load with an expression like 10\[MPa\]\*(X>X\_min)\*(XY\_min)\*(Y

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