×
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!
  • Students Click Here

*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.

Students Click Here

Jobs

Re: Plotting Strength ratio of composite with param SRCOMPS (Nastran 2018.3)

Re: Plotting Strength ratio of composite with param SRCOMPS (Nastran 2018.3)

Re: Plotting Strength ratio of composite with param SRCOMPS (Nastran 2018.3)

(OP)
thread825-222534: Plotting Strength ratio of composite with param SRCOMPS

"To whom it may concern"

Hi all,
I am referring to the above thread titled "Plotting Strength ratio of composite with param SRCOMPS" from 2008/2009. It has helped me calculate strength ratios (SRs) in Nastran 2018.2 while using Hypermesh and HyperView 2017.3 as pre and post processors.
User babajv has posted a DMAP alter that substitutes Failure Indices with SR results in the .op2-file, so that you can view the SRs in HyperView or Patran. However, since the original alter is for Nastran 2005, my colleagues and I had to change the code so that the alter is done at the right place in the recent Nastran version. The alter works fine on a 95k+ elements model.

The new alter is:

compile sedrcvr
$
$ ***This DMAP works with only param,post,-1
$
$ DMAP alter to replace Failure Index data block with
$ the Strength Ratio data block. The f06 will have both
$ Failure Index and Strength Ratio values printed as
$ usual; however, the op2 file has the Failure Index
$ data replaced with the Strength Ratio data.
$
$ by Dean Bellinger, 7Jul2006
$
$ WARNING: Tested with only one test case using two elements,
$ and two subcases on version 2005.5.0 and 2005.0.0.
$

$alter 'output2.*oes1c,oefit,oesrt' (1,-1) $
alter 1964
copy oesrt/oefitz/always/-1 $
type parm,,i,n,reclpoef $
reclpoef=1 $
do while ( reclpoef>=0 ) $
paraml oefitz/oefitzz/'tabrepi'/s,n,reclpoef/2//25 $
reclpoef = reclpoef + 2 $
paraml oefit//'dti'/s,n,reclpoef/2//s,n,junkit $
equivx oefitzz/oefitz/always $
enddo $ reclpoef
equivx oefitzz/oefit/always $
MESSAGE//'FAILURE INDICES REPLACED BY STRESS INDICES, oefit ' $
endalter

To learn how to use the alter in general, please refer to the original thread linked above. As you can see, the original target of the alter is commented out, and a new target (alter 1964) in the solver routine has been introduced. The MESSAGE at the end is only to check in the .f06 if the alter has gone through properly, because we had to try different lines that control .op2 output. If you are using a different version of Nastran, you might have to try and change that target to fit your version.

The original post has helped me a lot, so maybe this can help someone else at some point...

RE: Re: Plotting Strength ratio of composite with param SRCOMPS (Nastran 2018.3)

Hi,
I wrote the original post, and still here, using nastran, so I thank you for this update that could be useful for me. thanks a lot.
Stefano

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

White Paper - Guide to Integrate Large-Format Additive
As with any new technology, getting into large-format 3D printing begins with investigation. The first question may be a simple one: what does “large-format” mean? For 3D printers, “large” is a relative term. Many extrusion-based (FFF) 3D printers are referred to as desktop machines, because they fit on table space. Some of these have very respectable build volumes – but when it comes to “large-format,” the machines will need their own dedicated floor space. Large-format 3D printers have significant build volumes and are most often found in professional settings, like manufacturing facilities and R&D centers. Download Now
eBook - Efficient and Effective Production Support with 3D Printed Jigs and Fixtures
Jigs and fixtures offer manufacturers a reliable process for delivering accurate, high-quality outcomes, whether for a specific part or feature, or for consistency across multiples of parts. Although the methodologies and materials for producing jigs and fixtures have evolved beyond the conventional metal tooling of years past, their position as a manufacturing staple remains constant due to the benefits they offer. Download Now

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