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## #1 2019-01-23 18:41:28

marcoC
Member
Registered: 2018-06-13
Posts: 43

### DKT element COQUE_3D

Hi,

I am analizing a simple FEM model and I have assigned plan DKT element:

MODELISATION=('DKT', ),
PHENOMENE='MECANIQUE',

then I have defined an element property COQUE_3D:

COQUE=(_F(
EPAIS=5.0,
GROUP_MA=('shell_23', 'shell_21', 'shell_18', 'shell_19', 'shell_12', 'shell_16', 'shell_17', 'shell_14')

I have run the calculation, but I am confused: I am using a plan FEM element (‘DKT’) or a curved FEM element (COQUE_3D) ?

Regards,

marcoC

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## #2 2019-01-23 21:10:11

mecour
Member
From: Ostrava (Czech)
Registered: 2011-04-04
Posts: 188

### Re: DKT element COQUE_3D

Hello,

the answer is simple. In Affe_modele you define the type of finite element DKT (kirchhoff plate) Coque_3D (3D-shell).  The difference between plate and shell is clear I think.
In affe_carra_elem you define the properties of plate or shell like thickness, number of layers.... -- This properties are the same for plate and shell so you dont need separate operator for DKT and Coque_3D.

mecour

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## #3 2019-01-24 12:43:49

marcoC
Member
Registered: 2018-06-13
Posts: 43

### Re: DKT element COQUE_3D

So I am using a 3D curved shell ?

Kirchhoff's plates are plain, COQUE_3D introduces an initial curvature of the plate not related to the deformation under loads?

Thank's

marcoC

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## #4 2019-01-24 18:56:19

jeanpierreaubry
Guru
From: nantes (france)
Registered: 2009-03-12
Posts: 3,920

### Re: DKT element COQUE_3D

hello

it is very simple, as said above
with MODELISATION=('DKT', ),
you are using plain kirchoff element