I have a question here, is that Neo-Hookean model is suitable in predicting rubber under compression?
I was given a set of data which provide me force-deflectin data. The rubber is cylindlicar shape, height=0.925 inch, Diameter = 0.984 inc, shape facter =0.2659. Initial young modulus under compression about 2050 ibs, poision ratio take 0.4997 (by guess). The rubber be compressed 0.118 inch (3 mm), 12.77% strain. When I using Ansys, neo-hookean model to compare the test data i given, that is totally unmatch with the force-displacement curve unless first 0.1-0.3 % strain. Afther that the force shoot up without stoping as the stiffness almost not softern but the given test data actually sorften after 2% of compression.
PS: I am not given any other data for using orther material model but just Neo-Hookean. And is that anybody can tell me why this model so unmatch with this case?