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#1 2019-02-27 11:58:07

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

FORCE_COQUE meaning

Hi, I would like to apply a vertical load to an inclined group of plane elements.

Is it correct the following .comm script:

load0 = AFFE_CHAR_MECA(
  FORCE_COQUE=_F(
    FZ=0.5,
    GROUP_MA=('load_20', 'load_21')
  ),
  MODELE=model
)

I am applying a surface force of 0,5 N/mm2 in Z direction ? Or I am applying a pressure normal to group element faces ?

Regards,

marcoC

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#2 2019-02-27 12:11:47

GPSalachs
Member
Registered: 2018-03-10
Posts: 257

Re: FORCE_COQUE meaning

code-aster.org/forum2/viewtopic.php?id=8827
Copying the answer:
Hi all together,

I think there is some 'logic' in the naming of the types of loads (even
sometimes it remains unlogic). Let me try:

The dimension of a load follows from its name:

FORCE_NODAL -> force per node -> N/-  (a node has no dimension)
FORCE_FACE    -> force per face  -> N/m2
FORCE_ARETE    -> force per edge  -> N/m
FORCE_CONTOUR    -> force per contour-length  -> N/m
FORCE_POUTRE    -> force per beam-length -> N/m

The first part of the name (FORCE_) indicates that You will have to specify
components (at least one from DX, DY, DZ, DRX, DRY, DRZ). Since there is no
other, this is done in the global CS. Components are needed because a FORCE_* is
a vector.

In some of the FORCE_* loads  (those which are applied to elements having a
local coordinate system) You have the choice to specify the components
in the gobal CS (at least one from FX, FY, FZ) or in the
local CS of the element (at least one from N, VY, VZ). This is possible for

FORCE_POUTRE    -> force per beam-length -> N/m in global or local CS
FORCE_COQUE    -> force per area-of-shell -> N/m2 in global or local CS

The "non_FORCE_loads" take there dimensionality often from their 'nature',
for example

PRES_REP distributed pressure. Pressure -> N/m2

and take their direction from the orientation of the elements (PRES_REP acts
normal to a face and not inclined as You can do with FORCE_FACE)

Well, what I am telling seems is not true for FORCE_TUYAU, where a pressure has
to be specified. I would like to rename it to PRES_TUYAU

Regards,
Johannes Ackva

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