×
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

How to define a function in UMAT

How to define a function in UMAT

How to define a function in UMAT

(OP)
Hi guys,
If I need a function in UMAT which is able to provide a extra strain in terms of time or some other variables, how should I define that?

RE: How to define a function in UMAT

If use UMAT you have to store the components of the strain tensor(s) as STATE variables (i.e STATEV array).

Technically it is up to the user to manage and use the STATEV array according to his needs.

For example you can design something like this:
STATEV(1) - elastic strain component 11
STATEV(2) - elastic strain component 22
.......................................
STATEV(6) - elastic strain component 13

STATEV(7) - plastic strain component 11
STATEV(8) - plastic strain component 22
.......................................
STATEV(12) - plastic strain component 13

STATEV (13) - equivalent plastic strain
STATEV (14) - whatever I want to store in STATEV(14)
and so on.....

UMAT Subroutine is supplied with plenty of info when it is called, inclunding time, temperature, step number etc. ...all the parameters being explained in the documentation section describing the subroutine.


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