I wrote a subroutine VDLOAD for dynamic explicit analysis in ABAQUS. the load is spatially distributed as well as varying with time.
the spatial distribution works fine. For variation with time I made an amplitude in CAE module but it is not behaving as desired.
As in VDLOAD subroutine there is an amplitude variable which is un-modifiable.
i want to ask what is the use/function of that variable?
should i need to write codes for the variation with respect to time of Pmax or it will be done automatically ?
Dear Abhishek,
You should define time dependency in VDLOAD user subroutine using stepTime and totalTime variables.
Amplitude variable is a constant that you insert when you define load (user defined) in Abaqus/CAE. If you multiply load with amplitude you could change load in Abaqus/CAE without changing VDLOAD.
Regards,
Khodaei
Respected Meysam Khodaei Sir,
thank you for rectifying my doubt. That was very helpful.
Sir still I have a doubt that, as it is mentioned in VDLOAD manual 'amplitude' was declared in unmodifiable variable than how can supply value for that variable?
as i tried to give some value manually buy equating it with some value in VDLOAD subroutine and it worked fine. but the above mentioned question is not justified as that variable is unmodifiable than the way I declared amplitude is correct or not.
Please help me.
Thank You
There is an example in Abaqus user guide that is used VDLOAD with amplitude.
"9.1.9 Deformation of a sandwich plate under CONWEP blast loading"
If you check last case .inp file " exa_aco_conwep_snd_vdload_1kg.inp " you will find using VDLOAD with referred amplitude.
** Amplitude ** *Amplitude, Name=OneConstant 0.0, 1.0, 1.0, 1.0 .
.
.
*DLOAD, Amplitude=OneConstant Top-Plate-1.Top-Surf, P2NU
But as you know amplitude could not be referred directly in Abaqus/CAE. Therefore you could write it in .inp file.
In subroutine file " exa_blast_vdload.f " you could find amplitude value usage.
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