×
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

Mass scale

Mass scale

Mass scale

(OP)
Hi,
I am using Explicit/Abaqus for my simulation. To decrease computational time, I artificially reduced the time period of the process (actual process takes 922s, the simulation is reduced to 500s). The result is acceptable.
But this way will come to effect of the rate dependent. I want to use mass scale to avoid this problem. Could you tell me which mass scale value is appropriate for above simulation. I tried some values of 100, 1000, 5000 and received an error "... the deformation speed is over 1000 times of wave speed.
Thanks in advance.
Tung       

RE: Mass scale

I usually see what the stable time increment is and then scale to match that increment times a speed up factor.  For your analysis you roughly doubled the speed of the analysis so if the stable time increment was 1e-6 now scale to 5e-5.  This should be more accurate than the previous method because it will only effect those elements that are below the 5e-5 threshold and not the whole model.  I hope this helps.

Rob Stupplebeen

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