Learning Forum

[dciesielski0103]

I try simulation crash test of locost frame, I modelling frame in SpaceClaim used beams. In explicit Dynamics my frame didn't move. What can i do?

[Erik Kostson]

 

Hi

 

I would suggest to place the wall exactly next to the frame so they are just touching (we do not want to resolve the travel time in explict).

See here how to set it up (see how the bc/displacement are defined as they allow the car to move towards the wall):

https://www.youtube.com/watch?v=EhTO0_ovhnA

All the best

 

Erik

 

[dciesielski0103]

Hi Erik
I try move wall to beam but this still didn't work. Maybe I set something wrong.

All the best

[Erik Kostson]

 

 

 

Hi

Place the wall a bit closer (gap should be much less than 27778 mm/s*0.001 s ~ 27 mm , so say 5 mm or so).

Then:

Can you show the frame displacement at the simulation end time (0.001 s) , because your sim. goes only up to ~1E-8 so perhaps it has not run fully (due to error, etc.) – we want to see if it has actually travelled the gap between the frame and wall.

Also show the stress contour of the wall to see if it deflects.

All the best

Erik

 

 

 

[dciesielski0103]

Hi

Wall touch the beam, offset the wall is 5mm from the beam but thickness is 10mm middle so i think they touch the frame. I have something like that only

All the best

[mohan.urs]

Hey,

Can you check this course once and see if you have the setup right. The course is very similar to what you are doing.
https://innovationspace.ansys.com/courses/courses/explicit-analysis-of-a-chassis/?template=academic
Let me know how it works out.

Regards,
Mohan Urs

[dciesielski0103]

Hey,

My solution is convert SpaceClaim geometry to DesingModeler and body start move.

But I have question how to turn on stress on beams in explicit dynamics?

Regards

[mohan.urs]

Hey, Please check this Knowledge material from ansys for this query - 
The equivalent stress plot of beam elements shows the value 0 even these beam elements are actually deformed and stressed. How do I get these information from Explicit Dynamics system? | Ansys Knowledge

Regards,
Mohan Urs