Control the displacement 1

[phanhung]

Hi
i have the velocity 0.2mm/s, and the total time for experiment is 97.5 sec, and the displacement is 19.5mm. I set up the boundary condition type=velocity 0.2mm/s, the time in stactic step is
Static
97.5, 1, 1e-05, 1
But in the result, i got the displacement is 40mm (not 19.5mm). I think something wrong with the total time. i would like to control the displacement is 19.5mm. Tell me how to set up the time to control the displacement, or any other ideal to solve it.

Thanks
Phanhung

 

[corus]

Why not set the boundary condition to be the displacement of 19.5mm, then the velocity should be 0.2

corus

 

[xerf]

Indeed there is something wrong with the total time as (it seems) you input it.

The syntax for *STATIC is:

*STATIC
t1,t2,t3,t4

where:
t1=initial time increment
t2=time period of the step
t3=minimum time increment
t4=maximum time increment

 

[phanhung]

Hi xerf

Finally, where can i set up for the total time 97.5sec???

Regards
Phanhung

 

[sendy]

Hi Phanhung,

I think you can set the velocity boundary as 0.2. Then the time step for static option: (for example)
1,97.5,0.05,2.
This means that velocity of 0.2 is applied upto t=97.5 with initial time increment of 1 and next maximum and minimum time increment are 2 and 0.05, respectively. The total displacemet would be 19.5 when t=97.5.

In addition to this, you might want to read the manual about how abaqus lowering/increasing the time increment when no convergence occurs.

Hope this help abit.

regards,
Sendy.

 

[phanhung]

Hi
Thanks Sendy, i got it

Regards
Phanhung