Non adequation between 2D and 3D representation

Hi Alice,

Normally it should give the same results. Only for the deflection you are getting a different result?.

Please see this link http://www.altairuniversity.com/wp-content/uploads/2014/02/meshing.pdf (Page No:5) where a similar case is done.

Hi George,

I get 1mm deflection with shells, 7.10-2mm with Bricks. 

The other parameter I check is the resultant force on the clamped edge, to be the sum of all nodes' loads. This is ok, but the deflection not...

2D plate:

- clamped nodes at edge

- all innner nodes under loading

3D plate:

- clamped nodes at edge on all layers (8 elements in thickness)

- all inner nodes on upper face under loading

Share your model?

here you go,

thank you

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I try changing the properties /PROP/SOLID from Isolid = 17 to 14, as 14 is the default value for IMPLICIT option, I am using. I put Inpts to 222 and I get a deeper deflection but showing weird localisation (see attached picture, highly zoomed in to see the problem). It is as if I did not apply the load in the center, but I apply the same load as before, when I used Isolid = 17.

I read about the HA8 and H8C elements properties but do not understand how I can come to such wierd results on displacement. Could you explain me the differences between these 2 options ? 

<?xml version="1.0" encoding="UTF-8"?>

Hi Alice,

Will update you on this regard very soon.

Thank you George, I checked everything again, and do not understand what is wrong.

Hi Alice,

This seems strange. 

Normally it should give similar results. Did you try with different element formulations?.

Also, as a workaround can you try with second order solid elements?.

I tried with second order BRIC20 elements as you suggested. Viewing is even worse (see attached file)...

<?xml version="1.0" encoding="UTF-8"?>

Hi Alice,

Please share this specific model starter and engine file.

Thanks in advance

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