i am working with a material model, *Mat_181, a simplified rubber model, and I have some questions about the model parameters, MU G and SIGF.
From the manual of material of Ls-Dyna I found:
So, I know what the shear modulus is in classical terms, but what is the shear modulus for frequencyMU= Damping coefficent
G= Shear modulus for frequency indipendent damping. Frequency indipendent damping is based of a spring and slider in series. The critical stress for the slider mechanism is SIGF. For the best result. the value of G should be 250-1000 times greater than SIGF.
SIGF= Limit stress for frequency indipendent, frictional, damping.
Does somebody know what are these parameters and how I can get them?
Has somebody never worked with this material model?
These are some articles about this material model and the material model number 183. The material model 183 is the same of the 181 but with damage.