This model is a modification of the Hertz-Mindlin model where the effective radius is calculated using the Nassuaer-Kuna formula where V is the overlap volume and d is the penetration depth.

The effective radius, *R _{NK}* is used to determine the equivalent radius,

All forces are multiplied by the correction factor of 0.62/0.752 specified in Based on: Nassauer, B., 2013.

This produces the following:

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