Checking stabilization energy much less than 10% strain energy in buckling analysis - meaning

  • Last Post 11 November 2019
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Gennaro posted this 09 November 2019

Hello everyone,

in the slides of Ansys (attached) I read that, after the simulation, I have to check if the energy dissipation ratio (EDR) is greater than the EDR initially specified (slide 39).

How can I do that? In the slide 43 the suggested check is:

max stabilization energy << 10% strain energy

This means that the strain energy coincides with the potential energy mentioned in the slide 39:

EDR = (stabilization work) / (potential energy)


Thank you in advance.

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peteroznewman posted this 09 November 2019

Does it clarify things if you know the following equality?

      Potential Energy = Strain Energy

I think the slides introduced unnecessary terminology when they added potential energy. It would be clearer if the slides stayed with strain energy.

EDR = Stabilization Energy / Strain Energy.

Gennaro posted this 10 November 2019

Hello Peter,

I know the equality (I found it in many books; e. g. "The Finite Element Method and Applications in Engineering Using ANSYS® - Erdogan Madenci, Ibrahim Guven 2nd Ed"):

Maybe your equality is valid in special cases. If you know any paper or book where I can find your equality, give me its name please because I need to explain my sentences to my professor.

Thank you a lot. 

peteroznewman posted this 10 November 2019

Here is the ANSYS definition of Element Potential Energy, which for an elastic analysis is Strain Energy.
There is a separate quantity for Work Done by External Loads.

There is also Kinetic Energy, but for a Statics / Linear Bucking, there is zero velocity.


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Gennaro posted this 11 November 2019

Hello Peter, thank you for your reply. Can you tell me where you took the above paragraphs please?

Aniket posted this 11 November 2019

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Gennaro posted this 11 November 2019

Hi Aniket, I am not able to open your first link. Can you tell me what is it please? If you write the key word you inserted in the help, I can find it.

peteroznewman posted this 11 November 2019

If you are using ANSYS 2019 R3, then do this.

1. From ANSYS Workbench, use the menu Help > ANSYS Workbench Help.  A browser window will open.

2. In the post that has a link to the ANSYS Online Help, Right Mouse Button on the link and select Copy Link Address,

3. Go to the browser window that opened in step 1 and Paste in the address bar and you get to the required page.

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Gennaro posted this 11 November 2019

Perfect step by step solution. Thank you very much.