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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:

Fi=Akispl(qi,table)

Where:

qi is the displacement of Body-I relative to Body-J in the ith direction after offset, scaling and coupling effects have been considered.

table is the force-deflection table specified in the [SPLINE_STIFFNESS_xx] block in the .gbs file.