Eigenvalues of the system

[AleksaBgd94]

Hello everyone,
Is there any way to calculate eigenvalues of the system in Abaqus? Materials are defined as non-linear, including damage plasticity.
Thanks in advance.

 

[FEA way]

Yes, there’s a natural frequency (eigenvalue) extraction procedure in form of Frequency step. But it won’t account for any inelastic effects.

 

[AleksaBgd94]

Yes... And the interactions cant be considered, right ?

 

[FEA way]

True, but there's also a complex eigenvalue extraction procedure that can account for some nonlinearities. Check its corresponding documentation chapter, it explains all limitation of this procedure.