FEM Thermal Analysis of a PCB: a new challenge

[bernd]

attached screens of two cubes show the problem much better ... the intersection solid is missing if the boolean fragments solid are taken.

Screenshot_20181221_212853.png (79.01 KiB) Viewed 856 times

Screenshot_20181221_212950.png (77.85 KiB) Viewed 856 times

Screenshot_20181221_213128.png (262.97 KiB) Viewed 856 times

[bernd]

the file ...

multimaterial-intersection01.fcstd

(71.63 KiB) Downloaded 48 times

[bernd]

The question is what to to from user point of view ... One solution would be only define the solids for all the attached chips and leave the rest without solid definition, which means all other elements will get this material.

Attached your model ...

material-problem-simplified-works.FCStd

(799.28 KiB) Downloaded 48 times

I'm thinking if i find some check for this kind of problem ...

[bernd]

Another way would be just fix the geometry. Attached the file.

@easyw-fc: I use your manipolator workbench, which was on my ThisWorkbenchIneedToInstallAndPlay with for a long time. Today I did install and play with it with success It's a great tool !!!

Ahh, do not forget to remesh after fixing the geometry.

material-problem-simplified-fixed_geometry.FCStd

(834.01 KiB) Downloaded 54 times

[thschrader]

Another way would be just fix the geometry. Attached the file.

I see that you have only changed the order of the subbodies in BooleanFragments.
Right? Why does it work with another order?

changed_order.JPG (22.44 KiB) Viewed 811 times

[easyw-fc]

Another way would be just fix the geometry. Attached the file.
material-problem-simplified-fixed_geometry.FCStd

Hi @bernd
thanks for the file
I tried to do a temperature analysis but I couldn't let it works...
Here the file

material-problem-simplified-fixed_geometry-Temperature.FCStd

(24.22 KiB) Downloaded 55 times

@easyw-fc: I use your manipolator workbench, which was on my ThisWorkbenchIneedToInstallAndPlay with for a long time. Today I did install and play with it with success It's a great tool !!!

Thanks a lot! BTW Your FEM WB is brilliant!
Maurice

[bernd]

Another way would be just fix the geometry. Attached the file.

I see that you have only changed the order of the subbodies in BooleanFragments.
Right? Why does it work with another order?
changed_order.JPG

The order does not matter. The problem was lower solid was 0.04 mm inside the huge solid. Thus the boolean fragments created 4 solids out of the three. For the fourth solid there where no material assigned. What I did was alligning the solids with manipulator workbench exact face on face. Thus the boolean fragment does not create a fourth solid anymore. Thus defining material for all three solids works fine. Hope I could get you the point.

bernd