×
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

On softening data in some ABAQUS models

On softening data in some ABAQUS models

On softening data in some ABAQUS models

(OP)
Hello
The Documentation materials related to some models (like Drucker-Prager) implies that softening can be used under each of
*DRUCKER PRAGER HARDENING
The classic meaning of softening is that your Yield Stress starts to decrease while your Absolute Plastic Strain Rate is still increasing (dS/de <0 where S is stress and e is strain). is not it ? However, ABAQUS says that "HYDROSTATIC PRESSURE VALUES MUST INCREASE WITH INCREASING PLASTIC STRAIN"
I expected intially this message particularly knowing that ABAQUS implicit cannot handle the stiffness being negative at unless you use Riks Step/technique or Explicit Step.

I start to think that softening intended by ABAQUS means that both the Yield Stress and Absolute Plastic Strain Rate are decreasing. But that in fact would be unloading rather than softening.. would not be?
Please give me your opinion on this matter


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