Kindly help me out in analysis of the following problem in ANSYS.
Model consists of alternate layers of steel ( total -9nos) and rubber pad(8nos) in between the steel plates.I am using uniaxial tensile test data from ASTM specimens (Hyper elastic Mooney Rivlin model c1=1.2ksc and C2=0.8ksc)
Loading condition1: Top steel plate is fixed and pressure is applied on the bottom steel plate which gives an axial compression.I am able to match the axial compression with actual test data.
Loading condition 2: alongwith pressure; load is applied that causes shear deformation of one plate w.r.t other.(Problem:There is a mismatch observed between the load actually required to move the top steel plate and the load computed from analysis.)
I understand that load required depends on the shear modulus of the rubber and ANSYS takes intial shear modulous as 2(C1+C2) from the tensile test data which gives the wrong result.Also If we increase the pressure applied on the plates then the load required decreases.(How to simulate the variable shear modulus with pressure in ANSYS?Is it possible?)
I have both tensile and shear specimen data for the rubber used.When tensile data is used to compute the C1=1.2ksc and C2 =0.8ksc the axial compression matches.But when shear properties are included c1 changes from 1.2ksc to 3.3ksc and c2 changes from 0.8ksc to -3.2 ksc.Convergence is not attained with this set.
Do we need to use biaxial data for this model?will the load match in that case?