Dear 3DS,

On the following page from the Abaqus manual it is described how a spring can be adapted to be frequency dependent.
http://130.149.89.49:2080/v6.10/books/bmk/default.htm?startat=ch01s04ach39.html#sxmfreeoscdamp-peakamp-ve
The page shows analysis that have to do with harmonics and steady state behaviour.

I want to use frequency dependent springs for an Implicit Dynamic analysis step.
According to the file vibration_springdata.inp I have built my own table in file. In order to clearly show the change in stiffness, I have chosen the values k=50 and k=1000:
frequency_dependent_spring_own.inp
I have my own model that consists of a simple mass-spring system (attached to a part that has its dofs completely restricted to simulate a clamped foundation). The forcing drives up from 0.66Hz to 0.82Hz (0.106rad/s to 0.13rad/s):
Harmonic-build-up-model.inp
This file is generated from the following .cae file:
Mass-spring-freq-dep.cae
The main difference between the .cae model and the .inp file is line 52 that replaces the stiffness constant of the spring:
*INCLUDE, INPUT=frequency_dependent_spring_own.inp

For now, I am only finding that the first stiffness value from the stiffness table is used for the analysis.

Please let me know if it is possible to use frequency dependent stiffness of springs for the time domain analyses.