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Wisawanart

Bumper model set up (Interface error)

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Dear Altair support team

 

Let me explain regarding my FE model, I usually set up such kind of bumper model for crash analysis, unfortunately, this time I faced with the unfamiliar issues.

 

          As usual, I used the Tied_contact (Type2) to represent the spot welding by specifying the contact pairs as [M] cotact_surface and [S] GRNODE manually.

You can see the spot weld locations as the figure below (green ball represent the spot weld).

          For the self-contact, I used the Type19 and defined the contact pairs as SURF_EXT_PART for both.

Before running, I already used the Model checker but no error was found.

 

I will briefly show those kinds of errors,

 

ERROR ID :          558
** ERROR IN INTERFACE DEFINITON (MASTER SURFACE)       <<< This error came from Self-contact when I remove self-contact, this issue disappeared.

 

ERROR ID :          611
** ERROR IN INITIAL PENETRATION IN INTERFACE                   <<< This error came from Self-contact when I remove self-contact, this issue disappeared. I already fixed the initial penetration of model

 

WARNING ID :          343
** WARNING : INITIAL PENETRATIONS IN INTERFACE
WARNING ID :          499
** WARNING : INITIAL PENETRATIONS IN INTERFACE

 

ERROR ID :           22
** ERROR IN SHELL DEFINITION
DESCRIPTION :
   SHELL ID=222890 HAS 2 IDENTICAL NODES THAT ARE NOT 3 & 4

 

ERROR ID :           35
** ERROR IN TRIANGULAR SHELL GEOMETRY

 

For those issues, I tried to fix it first but it doesn't work,  I can share you this model for further details and the error format  is attached to this post

 

Best regard

Nut

 

 

 

Error_Format.txt

22.jpg

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Guest

Hi,

 

Is it possible to share the model file?

 

There are several modeling errors. Please use the file transfer link in my signature to share the model file

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Dear Altair support team

 

According to the Collision Detection,

I've just meshed once and rechecked the initial penetration searched by Edge, I found there have several Edge penetrations in this model as the figure below.

 In this model, the penetration due to the thickness was removed, normally, I did not concern about edge penetration.

 

Can I ask some questions?

1. Why the edge penetration occurs?

2. Can those ones cause further issues?

 

Thank you

Wisawanart

 

 

1111.PNG

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Guest

Hi @Wisawanart

 

I am looking into the issue and I see that the penetrations are also one of the causes of the error. 

 

There are few mesh errors. Like crushed tria and quad elements which are part of the self interface which are also causing the error. 

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Hi @Wisawanart

 

There are elements with length less than 0.1 and they are causing the problem in the interface (see the image below)

 

Please check and correct the same. 

Mesh_errors.png

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