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Crushed Cylinder

Altair Forum User

Hi,

I am trying to use shell element in a crushed cylinders only outer surface.

I am getting the following error

ERROR ID :          274
** ERROR IN RIGID BODY DEFINITION (INERTIA)
DESCRIPTION :
   -- RIGID BODY ID : 1
   -- RIGID BODY TITLE : rigid mass
   RIGID BODY HAS A NULL OR NEGATIVE INERTIA

Also i when i check element type using 2d i am getting value has 108 what does that mean. I wish to use a shell element. I have put it in the picture.

2) I wish to use only a single layer of shell element for the 3d igs model i have imported but a general 3d mesh can be easily done. Is it possible for only a 2d mesh directly rather than the procedure i did by not selecting another side.

yours sincerely,

kartik kanugo

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Altair Forum User

Hi,

Please try with the attached files.

I tried with element type and I didn't get any element highlighted as shown in the figure.

2) I wish to use only a single layer of shell element for the 3d igs model i have imported but a general 3d mesh can be easily done. Is it possible for only a 2d mesh directly rather than the procedure i did by not selecting another sid

Can you be more clear on this query?.

Unable to find an attachment - read this blog

Altair Forum User

Hi,

Please try with the attached files.

I tried with element type and I didn't get any element highlighted as shown in the figure.

Can you be more clear on this query?.

You created a new component for the rigid body and separated it.

Ok my query before was.

1) I created the geometry in a CAD software and imported it. ( the file is a 3d file I didn't use surface in the CAD software)

2) Now in hypermesh i wish to mesh the CAD file of the crushed cylinder with a 2D shell element. Such that there is only one element across the thickness.

3) For this I selected only the outer surface of the cylinder and meshed it using Automesh option in 2D.

4) To obtain a single element across the thickness is there a possibility without the above procedure ?

Also in the above i am not sure if there is one element across the thickness of the cylinder.

yours sincerely,

kartik kanugo

Unable to find an attachment - read this blog

Altair Forum User

Hi,

This procedure seems fine, and recommend to go ahead with the analysis.