Non linear material properties Ansys Mechanical.

[Thibault33]

Hi everyone,
I am working with Ansys Mechanical and I need to create a non linear material.
I want this material to have some orthotropic propoerties but I also want one direction to be non linear.
Actually what I would like to have is a material with non linear properties on one axis and different properties on the orthogonal directions.
Can someone help me with this ? I can also use Workbench if it is easier to define.
Thank you

Sincerely
Thibault

 

[Dave442]

Hi

This will depend on what type of nonlinear response you want to describe. I'm not an ANSYS user but I'm pretty sure anisotropic elastic-plastic and hyperelastic material models are available? I would check the materials section of the documentation.

Good luck,
Dave

 

[Thibault33]

Hi Dave,
Thank you for your answer.
The nonlinear response is the response of a ligament to some traction with a "toe region" from 0 to 0.06 of deformation where the curve is quadratic and after 0.06 it is linear. Also I want a very small compression modulus. Actually I wish it would follow this graph attached.
And you are right, hyperelastic and anisotropic models are available but I do not know how to combine both because if I use an anisotropic model, it is linear and the thing with the hyperelastic model is that they do not fit my curve like I would like to...

 

[scarules2006]

Hi,
Have you tried all the available hyperelastic models? None fit the curve like you would like?

 

[Thibault33]

Hi,
I did try those hyperelastic models but I was not happy with the result. However my supervisor told me that it is fine for what we wanted to do.
Thank you very much for your answers.