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