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Hypercrash seat simulation

Hello,

I am currently carrying out a seat Crash Simulation. I have followed the seat-dummy Simulation process stated in hypercrash tutorials for the same.

When I try to the run the Simulation, the engine is crashing every time. The seat geometry is very complex and hence meshed seat contains some intersections which I am unable to fix. I think this might be reason for engine Crash.

I am a novice in meshing such complex geometries and as well as Crash simulations.

Please do provide any help or suggestions regarding the same.

I have attached the starter out (0000.out) file for concerned Simulation.

Regards,

Sumedh V Joshi

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Altair Forum User

Hi Sumedh,

Use the recommended contact parameters are as below for interface Type 7:

Istf=4

Igap=2

Fscale_Gap=0.8

INACTI=6

Gap_min=

Fric = 0.1

Iform=2

Can you perform a model checking in HyperCrash (Quality>Model Checker), so that all possible modelling errors will be listed out. The steps for model checking can be seen at https://www.youtube.com/watch?v=xi-1EvfVuyw In the out file shared there are no penetrations listed.

If you still face the issue I recommend you to share the model file through secure dropbox link so that we can review the same.

Altair Forum User

Hello George,

Thanks for the reply.

I will work on your suggestions and get back to you!

Regards,

Sumedh V Joshi

Andy_20955

Hi,

If you cannot remove the intersections in your mesh, then you could use /INTER/TYPE24 contact with Inacti=5 in areas where you have the intersections. TYPE24 contact deals better with intersecting meshes than TYPE7.

Altair Forum User

Hi Andy,

Thanks for the reply!.

I'll try the same and get back to you.

regards,

Sumedh

Andy_20955

I downloaded your *.out file. You also need to check these warnings,

WARNING ID :          666
** WARNING IN SOLID ELEMENT DEFINITION
DESCRIPTION :
   CHANGED CONNECTIVITY OF 3D ELEMENT ID=5865175 TO AVOID NEGATIVE VOLUME
BRICK GROUP     18149 VECTORIZATION CODE = 255

and

WARNING ID : 430
** WARNING IN 4-NODE SHELL ELEMENT(S)
DESCRIPTION :
CONCERNING 406 SHELL ELEMENT
SHELL ID=31 IS A 4-NODE DEGENERATED SHELL ELEMENT, USE A 3-NODE SHELL FOR BETTER RESULTS

I suspect you have some elements with poor quality that could also cause a crash.