Search
Close this search box.
Notifications
Clear all

Usermat ANSYS

3 Posts
2 Users
0 Likes
783 Views
Posts: 5
Topic starter
(@vivienne)
Active Member
Joined: 16 years ago

Hi,

I am a newbie in ANSYS and I have a doubt about the Jacobian Matrix and the strain and stress tensors used in the USERMAT routine.

In the numerical approximation of the Jacobian Matrix, the incremental strain that I have to use is a increment in the logarithmic strain tensor or in the right cauchy green tensor?

And... the increment in the stress tensor is a increment in the Kirchhoff stress tensor or in the Cauchy stress tensor?

I have developed a variational constitutive model and I would like to implement it in ANSYS. Anyone can help me?

Jakson

Topic Tags
2 Replies
Posts: 3998
(@jorgen)
Member
Joined: 4 years ago

I believe it is the partial derivative of the increment in Kirchhoff stress with respect to the increment in logarithmic strain.

Topic Tags
2 Replies
Posts: 5
Topic starter
(@vivienne)
Active Member
Joined: 16 years ago

Thanks Jorgen,

I will try in this way after that I compile with success my USERMAT routine, with the IMSL Fortran Library. (I posted this problem in another section of this forum)

Best regards,

Jakson

Reply
Share: