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

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

- November 9, 2019 at 11:40 am
  
  Gennaro
  Subscriber
  
  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.
- November 9, 2019 at 10:46 pm
  
  peteroznewman
  Subscriber
  
  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.
- November 10, 2019 at 7:23 am
  
  Gennaro
  Subscriber
  
  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.
- November 10, 2019 at 9:45 pm
  
  peteroznewman
  Subscriber
  
  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.
- November 11, 2019 at 8:23 am
  
  Gennaro
  Subscriber
  
  Hello Peter, thank you for your reply. Can you tell me where you took the above paragraphs please?
- November 11, 2019 at 9:36 am
  
  Aniket
  Ansys Employee
  
  https://ansyshelp.ansys.com/account/Secured?returnurl=/Views/Secured/corp/v195/ans_thry/thy_tool16.html
- November 11, 2019 at 9:57 am
  
  Gennaro
  Subscriber
  
  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.
- November 11, 2019 at 1:20 pm
  
  peteroznewman
  Subscriber
  
  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.
- November 11, 2019 at 2:14 pm
  
  Gennaro
  Subscriber
  
  Perfect step by step solution. Thank you very much.

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