Sheet Metal Bending-Contact/BC set up

Alibay
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8 years 4 months ago #8471 by Alibay

Replied by Alibay on topic Re: Sheet Metal Bending-Contact/BC set up

Thanks Claws, I will look into your simulation.

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Alibay
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8 years 4 months ago #8472 by Alibay

Replied by Alibay on topic Re: Sheet Metal Bending-Contact/BC set up

I am wondering if it is possible to visualize the results until the point where simulation crashes in case there is no complete convergence?
e.g. I have 100 steps in my simulation, and it crashes at time step 37. Can I visualize the results until time step 37? if yes,how?

Thanks.

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Alibay
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8 years 4 months ago #8474 by Alibay

Replied by Alibay on topic Re: Sheet Metal Bending-Contact/BC set up

One of the thing I noticed that others did for reducing computation time in contact simulation, they deleted volume of 3D mesh of what is considered to be rigid bodies, and let only skin of 3D rigid bodies take part in simulation. In addition to this, " there is not material properties attached to them: they do not have any stiffness and are thus not included in the simulation for anything else than for contact resolution."
quote from Convergence problems in a shell forming simulation

Can someone explain why this works and what are things needed to be done for this setup?
Thanks.

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Claus
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8 years 4 months ago #8475 by Claus

Replied by Claus on topic Re: Sheet Metal Bending-Contact/BC set up

If you save the 'base' while simulating, you can use 'Stanley' to review the simulation up until the last step. Right click on the base folder in EFICAS and select Stanley.

Regarding the use of edges and shells: In those situations the strain and stresses in the dies are not important or interesting, only the behaviour of the material being shaped is interesting. Thus the dies are disregarded.

You should have a look at the case files rather than me trying to explain how to do it

Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version

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Alibay
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8 years 4 months ago #8477 by Alibay

Replied by Alibay on topic Re: Sheet Metal Bending-Contact/BC set up

I see you assigned no RHO value to the material, and then assigned the material to the mesh.
I did the same, why i always get this error

!----------------------------!
   ! <EXCEPTION> <MODELISA9_77> !
   !                            !
   !  manque le paramètre  RHO  !
   !                            !
   !  pour la maille  M16203    !
   !----------------------------!
   
   
   !----------------------------!
   ! <EXCEPTION> <MODELISA6_4>  !
   !                            !
   !   Erreurs dans les données !
   !----------------------------!

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Claus
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8 years 4 months ago #8478 by Claus

Replied by Claus on topic Re: Sheet Metal Bending-Contact/BC set up

If you're still using DYNA_NON_LINE from the previous post, then you need to assign density to the elements.

/C

Code_Aster release : STA11.4 on OpenSUSE 12.3 64 bits - EDF/Intel version

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Sheet Metal Bending-Contact/BC set up

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