INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Jobs

Ansys does not comply with ASME Section VIII Div. 2 part 5

Ansys does not comply with ASME Section VIII Div. 2 part 5

(OP)
thread569-380066: ASME VIII Design By Analysis with Ansys WB 15

Hi,

This is in reference to the thread in which TGS4 says that "ansys does not comply with ASME VIII div.2 part 5". Can someone elaborate on that? Because I went through the ANSYS help topics and searched "stress linearization" and saw the same formulae as used in the code. I do not see a reason for non-conformation of ansys linearized stress with that dictated by the code.

Thanks,
Shiraz

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

Have you reviewed 5-A.4.1.2?

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

See Step 2 (b). That's the critical parry.

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

(OP)
Thanks TGS4,

I see that a macro is already there wherein this critical parry is taken care of. Saw it few weeks ago and there was a manual evaluation (in one of the axis-symmetric models) by taking the values of Sx,Sy,Sz,Sxy and Seqv using PDEF command in ansys and doing manual calculation by applying simpson's rule of integration over these data points.

Thanks
Shiraz

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

You're completely missing the point.

Quote (ASME Section VIII, Division 2, Annex 5-A, 5-A.4.1.2)

Step 2. Calculate the bending stress tensor.
(a) Bending stresses are calculated only for the local hoop and meridional (normal) component stresses, and not for the local component stress parallel to the SCL or in-plane shear stress.

The point is that when assembling the bending stress tensor, it is composed of the membrane-plus-bending stresses ONLY from the hoop and meridional directions. In the other orthogonal direction (through-thickness), as well as for all of the shears, only the membrane stress is to be used when forming the tensor. ANSYS generates that tensor using membrane-plus-bending for all 6 component stresses, without an option to revert any components to membrane only.

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

Sounds like a need for an enhancement request. Or maybe a job for APDL.

Rick Fischer
Principal Engineer
Argonne National Laboratory

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

Have been requesting it since 2002. And have been asking other users to request it, too. Even mentioned that ABAQUS has had this capability. We'll see...

I have a work-around, in any case.

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

What's the workaround? Macro?

Rick Fischer
Principal Engineer
Argonne National Laboratory

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

Some APDL and some MathCAD worksheets.

RE: Ansys does not comply with ASME Section VIII Div. 2 part 5

I contacted our Ansys tech support guys. They are putting in an enhancement request, and they are sending me a macro. I'll keep you posted.

Rick Fischer
Principal Engineer
Argonne National Laboratory

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close