split hopkinson pressure bar

[balflearlee]

im currently doing FEM analysis on split hopkinson pressure bar compression testing using abaqus. Below is some problem that im facing now:-
1. i do not know how to apply a nonuniform velocity on the striker bar.
2. The elastic wave i generated on the input bar does not contain reflected wave.

 

[MrMyers]

Do you mean non-uniform as in velocity that changes with time? if so, employ *AMPLITUDE and vary your velocity sa you want it.

If you mean non-uniform velocity with respects to location on a model, you will likely need to employ a subroutine - I understand this is using DISP (this method can also be used to create a time-based + location based non-uniform input).

Hope this helps

 

[balflearlee]

yea, non-uniform velocity changing with time. I did that by varying the Amplitude, but i still can't get the reflected wave in the incident bar. The attachment is the inp file that i have did. Suppose the reflected wave(positive strain) is in opposite direction of the first wave produced in the bar. Unforturnately all the wave i obtained is in negatives strain.
Thanks for your reply and opinion.

 

[MrMyers]

It appears the link does not work.