Abaqus Hyperelastic MAterial

[ShiningEngineer]

How do you do?

I would like to simulate a substitute test for the compression test for hyperelastic materials in Abaqus. I have experimentally determined a lattice structure, test data from a compression test and transverse contraction number.

Now my question is:

If I enter the test data for stress in MPa and strain (nominalized 0.8 instead of 80%), the test data is not ideally mapped. The FEM results are much higher.

I have read in the Abaqus documentation that the test data from a compression test should be entered with a negative sign in the test data, for example

-0.1 for the strain and -0.0009 for the stress.

Nevertheless, the Hyperfoam/Hyperelastic material models do not match the test data perfectly. For the comparison, I export the reaction forces on my rectangle from Abaqus, the specified unit of the reaction force should then be in Newtons if my entire model and my forced deformation was modeled in mm, right?

Perhaps someone has another tip that I could look at?

Best regards and thanks for the tips

 

[FEA way]

Abaqus/CAE has a built-in material evaluation tool where you can enter test data and calibrate selected hyperelastic material models (simple finite element models are submitted internally). Give it a try.

 

[ShiningEngineer]

Hello, thank you for your answer i did that already.

Understanding of Material Calibration Question - DASSAULT: ABAQUS FEA Solver

Hello, can someone explain to me why the first plot is stable in the material evaluation and the second is not? This makes no sense to me. Test data from compression test are entered with a negative sign (-strain and -stress). Greetings

www.eng-tips.com

By accident i opened a new Thread, i am sorry. I dont understand why the good correlation is unstable and the bad one stable, when the fits are not correct in my opinion.

 

[FEA way]

Ok, let’s continue in that new thread where you shared the screenshots.