Mass scale

[gatre]

Hi,
I am using Explicit/Abaqus for my simulation. To decrease computational time, I artificially reduced the time period of the process (actual process takes 922s, the simulation is reduced to 500s). The result is acceptable.
But this way will come to effect of the rate dependent. I want to use mass scale to avoid this problem. Could you tell me which mass scale value is appropriate for above simulation. I tried some values of 100, 1000, 5000 and received an error "... the deformation speed is over 1000 times of wave speed.
Thanks in advance.
Tung

 

[rstupplebeen]

I usually see what the stable time increment is and then scale to match that increment times a speed up factor. For your analysis you roughly doubled the speed of the analysis so if the stable time increment was 1e-6 now scale to 5e-5. This should be more accurate than the previous method because it will only effect those elements that are below the 5e-5 threshold and not the whole model. I hope this helps.

Rob Stupplebeen