Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.

Keep eigenvector of a stress tensor FIXED when eigenvalue becomes positive?

Please login with a confirmed email address before reporting spam

Dear all,

I am working on a mechanical problem of tensile failure. What I want to achieve is to Keep the eigenvector of a stress tensor FIXED when its eigenvalue becomes positive. That means I want to record the eigenvector at the moment when its corresponding eigenvalue becomes positive.

Do you have any ideas to do that?

Thank you for your time and help.

-------------------
Yu Zhang

1 Reply Last Post 13.08.2019, 01:47 GMT-4
Henrik Sönnerlind COMSOL Employee

Please login with a confirmed email address before reporting spam

Posted: 5 years ago 13.08.2019, 01:47 GMT-4
Updated: 5 years ago 13.08.2019, 01:38 GMT-4

Hi,

I would suggest coding the constitutive relation yourself through the External Material functionality. There you can easily store the state variables that you need, for example the normal of crack plane.

Regards,
Henrik

-------------------
Henrik Sönnerlind
COMSOL
Hi, I would suggest coding the constitutive relation yourself through the External Material functionality. There you can easily store the state variables that you need, for example the normal of crack plane. Regards, Henrik

Note that while COMSOL employees may participate in the discussion forum, COMSOL® software users who are on-subscription should submit their questions via the Support Center for a more comprehensive response from the Technical Support team.