Steady State Dynamics Vs Implicit Dynamics

800x600

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 (diamensions
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 nanometers. 

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.

Normal
0
false
false
false
EN-US
X-NONE
X-NONE
MicrosoftInternetExplorer4

/* Style Definitions */
table.MsoNormalTable
{mso-style-name:"Table Normal";
mso-tstyle-rowband-size:0;
mso-tstyle-colband-size:0;
mso-style-noshow:yes;
mso-style-priority:99;
mso-style-parent:"";
mso-padding-alt:0in 5.4pt 0in 5.4pt;
mso-para-margin:0in;
mso-para-margin-bottom:.0001pt;
mso-pagination:widow-orphan;
font-size:10.0pt;
font-family:"Times New Roman","serif";}