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Accessing displacement values within VDLOAD subroutine

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I am trying to model a load moving on a surface using ABAQUS explicit and need to reference the surfaces displacement within the subroutine. I can get simple examples working using the VDLOAD subroutine where the loading is not effected by the displacement of the surface.

Now am stuck trying to define the load as a function of the surface displacement (in addition to position). i.e. couple the load and surface together.

I have read elsewhere that because the surface displacement is a function of stiffness, a UEL subroutine may also need to be written.

Surely there is an easier way to access the displacement values through a VDLOAD script?...maybe using c++ ?

Many thanks,