Constant Stiffness Model

The linear stiffness force is computed according to Hooke’s Law of Elasticity:

F_{i} = - k_{i} \cdot q_{i}

$F_{i} = - k_{i} \cdot q_{i}$

Where:

$k_{i}$ $k_{i}$ is the constant stiffness value found in corresponding [CONSTANT_STIFFNESS_xx] block for the $i^{t h}$ $i^{t h}$ direction in the property file.

$q_{i}$ $q_{i}$ 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.

The default value for $k_{i}$ $k_{i}$ is the slope of the experimentally measured static spline at (0,0).