Check this thread: How to get SPRING2 element stress?
Ok, it looks like it is not possible to extract the spring forces directly (at least not if both sides of a spring are attached to other elements). I’ll try to write a python script that reads the displacements from the FRD file and uses them to calculate the forces.
However, it will probably be a bit tricky because I have to somehow synchronize the data for the *ORIENTATION and the stiffnesses from the *SPRING command with the FRD file.
try this better Extracting springs force and elongation