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Steady State Dynamics Vs Implicit Dynamics

Steady State Dynamics Vs Implicit Dynamics

Steady State Dynamics Vs Implicit Dynamics

(OP)
Hello all,

There has been much debate about the difference between Implicit and Explicit Dynamics. I was wondering what exactly is the difference between 'Implicit Dynamics' and 'Steady State Dynamics (SSD)' steps in Abaqus though it has been explained a bit in the manuals.

I have run a simulation using both the cases for a very simple model of a fork (dimensions in mm) to which a probe(diameter 7 microns and length 3.8 mm) is attached at one end. There is a node to node connectivity between them. The fork has been subjected to a sinusoidal load (body force). The forcing frequency is close to the natural frequency of the fork. The other end of the fork is fixed. The displacement at the tip of the probe is desired. I did not consider any damping.

I got some interesting results. For the SSD case, the displacement is extremely high, which can be understandable, since there is no damping and the fork is vibrating at the natural frequency. However, if I solve the same model using 'Implicit Dynamics' step, it gives a deflection of few nano meters.

Can anyone please explain what exactly is the difference between the two steps? Technically also, I am unaware of the two terms. I assume that I made a mistake in carrying out the simulation. If any, can anyone please highlight it?

Thanks in advance!



Mandar

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