ASME III, Division 1 - Plastic Analysis (FEA) using Ansys 13.0
ASME III, Division 1 - Plastic Analysis (FEA) using Ansys 13.0
(OP)
Morning to All
We are designing a pressure vessel according ASME III, Division 1.
I'm checking the possibility of performing a plastic analysis using software ANSYS 13.0 but we have a concern: may I use this software?
In effect, at NB-3212, the Code specify that the teory of failure used is the maximum shear stress theory (Guest-Tresca), while ANSYS is based on Von Mises theory.
Thank you in advance for any suggestion.
Fabio
We are designing a pressure vessel according ASME III, Division 1.
I'm checking the possibility of performing a plastic analysis using software ANSYS 13.0 but we have a concern: may I use this software?
In effect, at NB-3212, the Code specify that the teory of failure used is the maximum shear stress theory (Guest-Tresca), while ANSYS is based on Von Mises theory.
Thank you in advance for any suggestion.
Fabio





RE: ASME III, Division 1 - Plastic Analysis (FEA) using Ansys 13.0
http://ansys.net/ansys/tips_sheldon/STI03_Yield_an...
RE: ASME III, Division 1 - Plastic Analysis (FEA) using Ansys 13.0
RE: ASME III, Division 1 - Plastic Analysis (FEA) using Ansys 13.0
Rules for the plastic analysis are given at NB-3228 and the paragraph doesn't force any particular theory of failure. In my opinion the von-mises rule could be used in spite of tresca as a failure criterion is used through out the code. However, use of tresca criterion might lead to numerical difficulties in plastic analysis (unfortunately I couldn't find any quote from the web..) and that's why it's not supported by ansys or abaqus.
If you are not strictly forced to follow the ASME code, you probably could use additional 15 % safety factor for yield strenght and von-mises failure criterion which is always conservative approach. See EN 13445-3 Annex B for example. I also suggest you to contact technical help of ansys.