Inventor Nastran Forum
Welcome to Autodesk’sInventor Nastran Forums. Share your knowledge, ask questions, and explore popular Inventor Nastran topics.
cancel
Showing results for 
Show  only  | Search instead for 
Did you mean: 

Questions about strain energy density

1 REPLY 1
Reply
Message 1 of 2
SHU_A
44 Views, 1 Reply

Questions about strain energy density

I am currently performing a nonlinear static analysis.

 

1. What formula is used to calculate Energy Density in Inventor Nastran? Please tell me the formula used in Nastran.

 

2. Is it possible to display units on the axis labels for Energy and Energy Density in an XY plot? Also, how can I find out the units of these two analysis results?

Labels (1)
1 REPLY 1
Message 2 of 2
John_Holtz
in reply to: SHU_A

Hi @SHU_A 

 

1. I cannot find the equation of how Nastran calculates the strain energy. One equation is shown in the Simulation Mechanical documentation. I suspect this is a standard equation. Strain Energy Density = 0.5*[Stress XX*Strain XX + Stress YY*Strain YY + Stress ZZ*Strain ZZ + Stress XY*Strain XY + Stress YZ*Strain YZ + Stress ZX*Strain ZX]. See Simulation Mechanical 2018 Help | Examples Using Custom Results | Autodesk

 

2. It is not possible to display the units. The results are in these units which are based on the units set in the Nastran environment when the analysis is ran. (You may want to change the units to SI before running the analysis so that the energy is in Joules = N*m.

  • Strain Energy: Force*length (such as N*m or lbf*in)
  • Strain Energy Density: Force*length/length^3 (such as N*mm/mm^3 or lbf*in/in^3)

John



John Holtz, P.E.

Global Product Support
Autodesk, Inc.


If not provided already, be sure to indicate the version of Inventor Nastran you are using!

"The knowledge you seek is at knowledge.autodesk.com" - Confucius :winking_face:

Can't find what you're looking for? Ask the community or share your knowledge.

Post to forums  

Autodesk Design & Make Report