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Transferring stress and strain data from a previous study into a new study on the deformed geometry

Posted Mar 12, 2025, 12:18 a.m. EDT Studies & Solvers, Structural Mechanics, Modeling Workflow Version 6.2 1 Reply

draf1992
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Hello,

I'm working with the Solid Mechanics module in COMSOL 6.2, and I'm analyzing a beam subjected to two loading steps:

In the first step (Study 1), I apply a load from the top, resulting in a deformed geometry along with stress and strain distributions.

In the second step (Study 2), I want to use this previously obtained deformed geometry, along with the existing stress and strain distributions, as initial conditions. Then I intend to apply an additional load from the bottom.

The beam is made of a linear isotropic material and is fixed at both ends, on the left and right sides.

The issue I'm encountering is that when running Study 2, COMSOL uses the original undeformed geometry by default and completely disregards the stress distribution obtained in Study 1. Consequently, when checking the geometry and stress transfer by applying almost zero load in Study 2, the results indicate zero stresses, implying that the stress state from Study 1 hasn't been transferred.

Is there a way to effectively transfer both the deformed geometry and the associated stress and strain distributions between two stationary analyses within a single COMSOL file? My objective is for the second analysis to account for the stress state obtained from the first analysis, rather than treating the deformed geometry as stress-free.

Has anyone successfully implemented any of these methods, or is there another recommended approach to ensure that both deformed geometry and stress distributions are properly transferred?

Thank you in advance for your help!

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1 Reply Last Post Mar 12, 2025, 4:30 a.m. EDT
Henrik Sönnerlind COMSOL Employee

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Posted: 3 weeks ago Mar 12, 2025, 4:30 a.m. EDT

Since the material is linear, the result of your loading is independent of history. You just have two cases:

  • Load 1 acting
  • Load 1 + Load 2 acting.

In your second study, you have apparently removed Load 1. That is, you model

  1. Apply Load 1
  2. Remove Load 1 (which should get you back to a zero solution for a linear problem).
  3. Apply Load 2

The only thing you need to do is to apply both loads in the second study. But easier (and computationally more efficient) is to use a single study with two loadcases.

-------------------
Henrik Sönnerlind
COMSOL
Since the material is linear, the result of your loading is independent of history. You just have two cases: * Load 1 acting * Load 1 + Load 2 acting. In your second study, you have apparently removed Load 1. That is, you model 1. Apply Load 1 2. Remove Load 1 (which should get you back to a zero solution for a linear problem). 3. Apply Load 2 The only thing you need to do is to apply both loads in the second study. But easier (and computationally more efficient) is to use a single study with two loadcases.

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