Constant Stiffness Model
The linear stiffness force is computed according to Hooke’s Law of Elasticity:
Where:
ki is the constant stiffness value found in corresponding [CONSTANT_STIFFNESS_xx] block for the ith direction in the property file.
qi is the displacement of Body-I relative to Body-J in the ith direction after offset, scaling and coupling effects have been considered.
The default value for ki is the slope of the experimentally measured static spline at (0,0).