I use BB model in Abaqus to simulate hysteresis property of a rubber elastomer. The top side is fixed and i input a sinusoidal time-displacement compression superimposed with a mean pre-displacement from the bottom side (Fig.1a), then get the time-response force from the fixed point (Fig.1b). Eventually obtain the displacement-response force relationship, i.e. hysteresis loop (Fig.2 Stress scaling factor of BB model S=0.6 and Fig.3 S=1.2 ).
the right line describes the local amplification part,
the blue arrow indicates the trend of response force.
My question is:
1. Anyone knows why there is softening of response force when S=0.6 while it nearly doesnt show when S=1.2? Is it Mullins effect? That means BB model can automatically predict Mullins effect as well? And S influences the Mullins effect prediction?
2. Any one knows exactly why Prony series cannot predict the well-known Payne effect? I know its a linear viscoelastic model while BB model is a nonlinear one. But why linear model cannot define payne effect? Get confused anyone knows clearly?
Thank you all ~~~