Hello everyone!

First of all Im very glad to be here, on this forum, and I hope someone can help me with my problem. Im trying to obtain some accurate results by modelling a problem with Ansys. My problem consists in a bush subjected to a radial displacement and Im trying to obtain the correct resulted force used for that displacement. The experimental radial tests show that for a displacement of 0.85 mm the applied load has a value of 4.05 kN and from my analysis Ive obtained a maximum value of 2712N(by using the Neo Hookean model). Ive tried also modelling the problem using Arruda-Boyce, Gent and Yeoh models but the results were almost the same (2709-2712N). In other problems involving rubber/metal springs subjected to axial loading, or even in this analysis when Ive subjected the bush to axial loading the results Ive obtained were accurate enough by using the Neo Hookean model with the coefficients determined from uniaxial experimental tests. Also by using different models (NH,AB,Yeoh,etc) when axial loading was involved the results werent so close like in the case of radial loading. The only experimental results I have when Im defining the material are those from uniaxial or planar tests. What can I do to obtain more accurate results when radial loading is involved? Do I need to input more test data? Biaxial? Thank you very much!

Kind regards,

Marius