ENGINE ERROR ID 79 : RADIOSS IMPLICIT STOPPED DUE TO LOADING DATA
Altair EmployeeHi all,
I am working on an implicit case. First I applied a load on a group of nodes. Now I apply an imposed displacement. It worked fine for the first one but I get an error in the engine file for the imposed displacement :
MESSAGE ID : 79
** ERROR : RADIOSS IMPLICIT STOPPED DUE TO LOADING DATA **
ISTOP=0
ERROR TERMINATION
Here my imposed displacement input:
/IMPDISP/551
IMPOSED DISPLACEMENT ON TOP NODES
# func_id dir skew_id sens_id grnod_id frame_id icoor
601 Y 803
# x_scale y_scale t_start t_stop
0 -3.000000e-02 0
I see tstop but what is ISTOP ?
Thank you in advance,
Alice
Find more posts tagged with
Altair EmployeeHi George,
Thank you for your reply.
I do not see any problems in my imposed displacement input.
I tried increasing timestep (from 0.001 to 0.1) but it didn't work either. Then I changed from /IMPL/LINEAR to /IMPL/QSTAT which makes it work though the h3d file shows nothing happening (no displacement).
I sent you my starter and engine file through the secure dropbox link. Thank you.
Altair EmployeeHi Alice,
I presume this error is because of the loading data.
In the loading function can you try with values below:
X Y
0 0
50 1
100 1
Altair EmployeeHi George,
I tried this and it works fine, thank you a lot ! What I did :
X Y
0 0
1 1
2 1
However, I wonder about Time History Data : At time 0 displacement is zero but reaction forces, which I want to output, are non-zero. How can that be ? Plus, after t=1, reaction forces still increase though displacement stays constant. I don't understand what is going on... Find my request on the attached screenshot
<?xml version="1.0" encoding="UTF-8"?>
Altair EmployeeHi again, can you give me any support on my issue ?
Thank you,
Alice
Altair EmployeeHi Alice,
Please check the rigid bodies defined in the model. And also, check the model for penetrations or intersections.
Please share the .out files.
Altair EmployeeHi Alice,
This is an issue related to RADIOSS implicit and our developers are working on it to get it done.
You can upload the *.h3d or A001 file in HyperGraph and can plot the reaction forces for the node.
<?xml version="1.0" encoding="UTF-8"?>
Altair EmployeeHi George,
This enables to begin from zero indeed, thank you !
But still, I stop displacement at time 0.5 ms (see function in my post from april 28 above). Reaction forces should decrease but they keep increasing. How that ?
Altair EmployeeHi Alice,
The reaction force curve seems to be bit strange with implicit options. I'll check with this.
Meanwhile I tried the same in RADIOSS explicit, and the plot seems to be fine. The model files are attached along.
<?xml version="1.0" encoding="UTF-8"?>
Altair EmployeeHi George,
Thank you for this update ! I check it later and come back to you.
Hi Alice,
ISTOP is a keyword to show the error. This error message occurs when no loading has been defined in the model or when loading is zero during the first step in a nonlinear analysis.
Below are a few suggested workarounds for this error:
1.Check loading in the model.
2.Increase the initial time step.
Let us know how it goes!