Hello,
For explicit dynamics, you can remove all the *CONTROL_IMPLICIT_ keywords from your model; you don't need them. Also, in explicit dynamics, the timestep is controlled by the solver (see my previous post) and not by the user. Usually, the explicit timestep is small enough (1e-6 or 1e-7 second) and what the user controls is the output frequency of results (*DATABASE_BINARY_D3PLOT, *DATABASE_ASCII, etc.). The timestep will vary a little bit based on the change in element size with deformation, but the output of results will remain the same. For example, if the explicit timestep is 1e-6, then you can have constant results output interval at say 1e-4 second.
Let me know if this helps or not.
Reno.
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