Impact response curve - pound_hz

The Impact response curve is described by Muthukumar and DesRoches [2006] and is based on the Herz Law. The model can be used for modeling impact and pounding events between oscillating structures. The model is characterised by compressive stress after the closing of the initial gap between the two members included in the pounding event. Four parameters have to be defined for the model:

Initial Stiffness (K1)
The default value is 30

Post Yield Stiffness (K2)
The default value is 2.6

Yield deformation (εy)
The default value is 0.02

Gap length (gap)
The default value is 0.005