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steady-state direct dynamic analysis is a frequency domain procedure. Use *Dynamic or *ModalDynamic instead (time domain)

Depends. Are you investigating the plate in the time domain or in the frequency domain?

The contact situation is frozen at the start of the perturbation analysis. Means that open contacts remain open and vice versa.

What about a TIE connection using node2surface intersction? You should consider using more than one element for the column

If its a dynamic analysis then the units of the density could be wrong (e.g. nonconsistent unit system)

Stiffness, density, maybe damping

Please provide more information (e.g. sketch, input deck... )

Perturbation analysis is 100% linear. Contact is a nonlinearity.

piecewise linear

1) write an animation to an avi file. then convert to single pictures usings a freeware 2) will use only the first 600 seconds

Hi 1) Its for smart engineers only 2) Use a Preprocessor to create the mesh. BC keyword: *BOUNDARY, Contact keyword: *CONTACTPAIR

To find out the element type please open the input file with an editor and search for *element,type=spring....

Since the hammer impact experiment is highly instationary you have to model this problem in the time domain (*ModalDynamic or *Dynamic in Standard or Explicit). Results should be passed through an FFT analyzer afterwards. Random reponse is based on an ergodic, stationary excitation which...

what spring element do you use ? Seems SPRINGA

Are these blocks perfectly rigid ?

C3D4 are very poor elements in strength analyses, I use them only when modelling masses. You need a very dense mesh to get accurate stress results. C3D4-Stiffness is also too high. In terms of contact both element types work well.

STEP level only

NLGEOM switch on or off ?

plastic strain = total strain - elastic strain elastic strain = stress / youngsmodulus

set deformation scale factor to 1.0 and plot again