hexagon logo
Register Sign in
  • State Not Answered
  • Replies 3 replies
  • Subscribers 5 subscribers
  • Views 88 views
  • Users 0 members are here
Options
Related

Why do I get underestimated strain energy values in the plastic region?

Palm_Tree
I have analyzed pure epoxy material with elasto-plastic material properties. I have defined the nonlinear plastic region using eq. plastic strain table. At the end of the analysis I get the global total strain energy (scalar) value but it is less than the real (experimental) value.
 
The figure below shows the true stress-true strain curves. Blue colored curve belongs to experimental data and the red colored curve belongs to results obtained after FE analysis.
1
In the elastic region curves almost coincide but in the plastic region there is huge strain energy difference.
 
By the way, I used 3D tetrahedron (element 157) for modeling epoxy.
Parents
  • 0
    Dear Zach Fata,
     
    Thank you for your reply,
     
    What do you mean by material characterization?
     
    Actually, FE result yields at the strain value where I initiated plasticity. Until that point (true) stress-strain values are almost the same. I am definig plasticity at the beginnig of non-linear region by using table. I have also added some of my analysis screenshots. May be it will be helpful for you to spot the mistake.
    1
    2
Reply
  • 0
    Dear Zach Fata,
     
    Thank you for your reply,
     
    What do you mean by material characterization?
     
    Actually, FE result yields at the strain value where I initiated plasticity. Until that point (true) stress-strain values are almost the same. I am definig plasticity at the beginnig of non-linear region by using table. I have also added some of my analysis screenshots. May be it will be helpful for you to spot the mistake.
    1
    2
Children
No Data
© 2025 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement