Menu

Discussion Forum

New Discussion
查找

Discussion ClosedThis discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one,click here.

Structural Simulation with CTE: Multiple Solid and Shell Interfaces

Posted 2026年3月10日 GMT+8 12:53Geometry, Structural Mechanics, Modeling Workflow1 Reply

Ravi Gupta
Send Private Message Flag post as spam

Please login with a confirmed email address before reporting spam

Hello,

I am trying to simulate a geometry which comprises of multiple stacks of rectangular cross section layers composed of 3D solids (~20 to 40 microns) and shells (~2 microns). There are various interfaces in this geometry across its thickness, which connect solid to shell, shell to shell, solid to solid & shell to solid. The width for all entire geometry is 4 mm and length is 20 mm.

I am trying to simulating thermal stress and strain between the various layers as per CTE. I have set the fixed constraint for the bottom most layer. I have also used Rigid Motion Suppression on solid and shell domains.

While computing the stress, in the results the corner points exhibit exceptionally high concentrations.

Regards,

1 Reply Last Post 2026年3月10日 GMT+8 18:09
Henrik Sönnerlind COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 8 months ago 2026年3月10日 GMT+8 18:09

There are at least four problems in your model:

1) You cannot mix Rigid Motion Suppression with other constraints like Fixed Constraint.
2) You cannot have more than one Rigid Motion Suppression in the model.
3) The connection between solid and shell should be of the type Shared Boundaries, not Parallel Boundaries since the shell elements share faces with the solids.
4) For a thin plate structure like this, it is better to use hex elements, swept in the thickness direction.

-------------------
Henrik Sönnerlind
COMSOL
There are at least four problems in your model: 1) You cannot mix Rigid Motion Suppression with other constraints like Fixed Constraint. 2) You cannot have more than one Rigid Motion Suppression in the model. 3) The connection between solid and shell should be of the type Shared Boundaries, not Parallel Boundaries since the shell elements share faces with the solids. 4) For a thin plate structure like this, it is better to use hex elements, swept in the thickness direction.

Note that while COMSOL employees may participate in the discussion forum, COMSOL®software users who are on-subscription should submit their questions via theSupport Centerfor a more comprehensive response from the Technical Support team.

Suggested Content

LinkedIn
Instagram
X
Baidu
map