Spline Stiffness Model

The spline stiffness formulation interpolates a Force vs. Deflection table using Akima’s cubic interpolation method. For values of deflection outside the supplied range, the force is linearly extrapolated using the slope at the corresponding end-point. For each direction employing the spline-stiffness formulation, you must supply a Force vs. Deflection table in the property file. The force is calculated as follows:

F_{i} = A k i s p l (q_{i}, t a b l e)

$F_{i} = A k i s p l (q_{i}, t a b l e)$

Where:

$q_{i}$ $q_{i}$ is the displacement of Body-I relative to Body-J in the $i^{t h}$ $i^{t h}$ direction after offset, scaling and coupling effects have been considered.

$t a b l e$ $t a b l e$ is the force-deflection table specified in the [SPLINE_STIFFNESS_xx] block in the .gbs file.