×
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

ELEMENT STIFFNESS MATRIX

ELEMENT STIFFNESS MATRIX

ELEMENT STIFFNESS MATRIX

(OP)
Hi,

I am using USDFLD and a solution dependent field variable to specify the variation of elastic modulus (fieldv=pressure=s11+s22+s33 in my case). Then how is the element stiffness matrix computed at beginning of each load increment? The material properties are a function of the field variable which in itself are solution dependent. I have read some text on this but it is not very clear to me. Can anyone help?

Thanks in advance

RE: ELEMENT STIFFNESS MATRIX

It's an iterative scheme. The solver has a similar task, when you make your material temperature dependend in a thermal analysis.

RE: ELEMENT STIFFNESS MATRIX

(OP)
Hi
Thanks for your reply. My confusion was because after using the subroutine, the stresses are computed correctly at the integration points but the strains are not. I thought that in FEM the order of solution is (i) nodal disp> strains> stresses. So, I was wondering how the stresses are correct but the strains are not.

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