Notifications
Clear all

Hyper-elastic material may become unstable, message for Mooney-Rivlin model

3 Posts
2 Users
0 Likes
513 Views
Posts: 10
Topic starter
(@furocious)
Active Member
Joined: 11 years ago

Hi All,

I am trying to use my experimental data for vulcanized natural rubber for some finite element simulation in ANSYS, and noticed that the closest fit is given by Mooney-Rivlin. But unfortunately, this material model gives the warning mentioned in the subject prior to solving, and the process terminates with error in element formulation.

Other material models like Neo-Hookean and Ogden dont seem to be providing a good fit with the experimental stress-strain curve, but theres no such warning or element formulation error for those.

Im simply using a rectangular area with Plane Stress w/Thk element real constant specified, plus the aforementioned curve fitting of my experimental curve.

Please advise.

Farhan

2 Replies
Posts: 3976
(@jorgen)
Member
Joined: 3 years ago

Can you show figures with the experimental stress-strain curve(s) that you have?

-Jorgen

2 Replies
Posts: 10
Topic starter
(@furocious)
Active Member
Joined: 11 years ago

Hi Jorgen,

I was able to curve-fit by unchecking the Use Normalized Error checkbox in the curve-ftting dialog in ANSYS. Im not exactly sure what purpose it serves, but the fits are good now.

Currently I dont have access to the images. I will share as soon as availble.

Many thanks!

Reply
Share: